path: root/contrib/restricted/googletest/googlemock/include/gmock/gmock-actions.h

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// 
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// met: 
// 
//     * Redistributions of source code must retain the above copyright 
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 

// Google Mock - a framework for writing C++ mock classes. 
// 
// The ACTION* family of macros can be used in a namespace scope to
// define custom actions easily.  The syntax:
//
//   ACTION(name) { statements; }
//
// will define an action with the given name that executes the
// statements.  The value returned by the statements will be used as
// the return value of the action.  Inside the statements, you can
// refer to the K-th (0-based) argument of the mock function by
// 'argK', and refer to its type by 'argK_type'.  For example:
//
//   ACTION(IncrementArg1) {
//     arg1_type temp = arg1;
//     return ++(*temp);
//   }
//
// allows you to write
//
//   ...WillOnce(IncrementArg1());
//
// You can also refer to the entire argument tuple and its type by
// 'args' and 'args_type', and refer to the mock function type and its
// return type by 'function_type' and 'return_type'.
//
// Note that you don't need to specify the types of the mock function
// arguments.  However rest assured that your code is still type-safe:
// you'll get a compiler error if *arg1 doesn't support the ++
// operator, or if the type of ++(*arg1) isn't compatible with the
// mock function's return type, for example.
//
// Sometimes you'll want to parameterize the action.   For that you can use
// another macro:
//
//   ACTION_P(name, param_name) { statements; }
//
// For example:
//
//   ACTION_P(Add, n) { return arg0 + n; }
//
// will allow you to write:
//
//   ...WillOnce(Add(5));
//
// Note that you don't need to provide the type of the parameter
// either.  If you need to reference the type of a parameter named
// 'foo', you can write 'foo_type'.  For example, in the body of
// ACTION_P(Add, n) above, you can write 'n_type' to refer to the type
// of 'n'.
//
// We also provide ACTION_P2, ACTION_P3, ..., up to ACTION_P10 to support
// multi-parameter actions.
//
// For the purpose of typing, you can view
//
//   ACTION_Pk(Foo, p1, ..., pk) { ... }
//
// as shorthand for
//
//   template <typename p1_type, ..., typename pk_type>
//   FooActionPk<p1_type, ..., pk_type> Foo(p1_type p1, ..., pk_type pk) { ... }
//
// In particular, you can provide the template type arguments
// explicitly when invoking Foo(), as in Foo<long, bool>(5, false);
// although usually you can rely on the compiler to infer the types
// for you automatically.  You can assign the result of expression
// Foo(p1, ..., pk) to a variable of type FooActionPk<p1_type, ...,
// pk_type>.  This can be useful when composing actions.
//
// You can also overload actions with different numbers of parameters:
//
//   ACTION_P(Plus, a) { ... }
//   ACTION_P2(Plus, a, b) { ... }
//
// While it's tempting to always use the ACTION* macros when defining
// a new action, you should also consider implementing ActionInterface
// or using MakePolymorphicAction() instead, especially if you need to
// use the action a lot.  While these approaches require more work,
// they give you more control on the types of the mock function
// arguments and the action parameters, which in general leads to
// better compiler error messages that pay off in the long run.  They
// also allow overloading actions based on parameter types (as opposed
// to just based on the number of parameters).
//
// CAVEAT:
//
// ACTION*() can only be used in a namespace scope as templates cannot be
// declared inside of a local class.
// Users can, however, define any local functors (e.g. a lambda) that
// can be used as actions.
//
// MORE INFORMATION:
//
// To learn more about using these macros, please search for 'ACTION' on
// https://github.com/google/googletest/blob/master/docs/gmock_cook_book.md
 
// GOOGLETEST_CM0002 DO NOT DELETE

#ifndef GOOGLEMOCK_INCLUDE_GMOCK_GMOCK_ACTIONS_H_
#define GOOGLEMOCK_INCLUDE_GMOCK_GMOCK_ACTIONS_H_
 
#ifndef _WIN32_WCE 
# include <errno.h> 
#endif 
 
#include <algorithm> 
#include <functional>
#include <memory>
#include <string> 
#include <tuple>
#include <type_traits>
#include <utility>
 
#include "gmock/internal/gmock-internal-utils.h" 
#include "gmock/internal/gmock-port.h" 
#include "gmock/internal/gmock-pp.h"
 
#ifdef _MSC_VER
# pragma warning(push)
# pragma warning(disable:4100)
#endif 
 
namespace testing { 
 
// To implement an action Foo, define: 
//   1. a class FooAction that implements the ActionInterface interface, and 
//   2. a factory function that creates an Action object from a 
//      const FooAction*. 
// 
// The two-level delegation design follows that of Matcher, providing 
// consistency for extension developers.  It also eases ownership 
// management as Action objects can now be copied like plain values. 
 
namespace internal { 
 
// BuiltInDefaultValueGetter<T, true>::Get() returns a 
// default-constructed T value.  BuiltInDefaultValueGetter<T, 
// false>::Get() crashes with an error. 
// 
// This primary template is used when kDefaultConstructible is true. 
template <typename T, bool kDefaultConstructible> 
struct BuiltInDefaultValueGetter { 
  static T Get() { return T(); } 
}; 
template <typename T> 
struct BuiltInDefaultValueGetter<T, false> { 
  static T Get() { 
    Assert(false, __FILE__, __LINE__, 
           "Default action undefined for the function return type."); 
    return internal::Invalid<T>(); 
    // The above statement will never be reached, but is required in 
    // order for this function to compile. 
  } 
}; 
 
// BuiltInDefaultValue<T>::Get() returns the "built-in" default value 
// for type T, which is NULL when T is a raw pointer type, 0 when T is 
// a numeric type, false when T is bool, or "" when T is string or 
// std::string.  In addition, in C++11 and above, it turns a 
// default-constructed T value if T is default constructible.  For any 
// other type T, the built-in default T value is undefined, and the 
// function will abort the process. 
template <typename T> 
class BuiltInDefaultValue { 
 public: 
  // This function returns true if and only if type T has a built-in default
  // value.
  static bool Exists() { 
    return ::std::is_default_constructible<T>::value; 
  } 
 
  static T Get() { 
    return BuiltInDefaultValueGetter< 
        T, ::std::is_default_constructible<T>::value>::Get(); 
  } 
}; 
 
// This partial specialization says that we use the same built-in 
// default value for T and const T. 
template <typename T> 
class BuiltInDefaultValue<const T> { 
 public: 
  static bool Exists() { return BuiltInDefaultValue<T>::Exists(); } 
  static T Get() { return BuiltInDefaultValue<T>::Get(); } 
}; 
 
// This partial specialization defines the default values for pointer 
// types. 
template <typename T> 
class BuiltInDefaultValue<T*> { 
 public: 
  static bool Exists() { return true; } 
  static T* Get() { return nullptr; }
}; 
 
// The following specializations define the default values for 
// specific types we care about. 
#define GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(type, value) \ 
  template <> \ 
  class BuiltInDefaultValue<type> { \ 
   public: \ 
    static bool Exists() { return true; } \ 
    static type Get() { return value; } \ 
  } 
 
GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(void, );  // NOLINT 
GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(::std::string, ""); 
GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(bool, false); 
GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(unsigned char, '\0'); 
GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(signed char, '\0'); 
GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(char, '\0'); 
 
// There's no need for a default action for signed wchar_t, as that 
// type is the same as wchar_t for gcc, and invalid for MSVC. 
// 
// There's also no need for a default action for unsigned wchar_t, as 
// that type is the same as unsigned int for gcc, and invalid for 
// MSVC. 
#if GMOCK_WCHAR_T_IS_NATIVE_ 
GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(wchar_t, 0U);  // NOLINT 
#endif 
 
GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(unsigned short, 0U);  // NOLINT 
GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(signed short, 0);     // NOLINT 
GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(unsigned int, 0U); 
GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(signed int, 0); 
GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(unsigned long, 0UL);  // NOLINT 
GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(signed long, 0L);     // NOLINT 
GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(unsigned long long, 0);  // NOLINT
GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(signed long long, 0);  // NOLINT
GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(float, 0); 
GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(double, 0); 
 
#undef GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_ 
 
// Simple two-arg form of std::disjunction.
template <typename P, typename Q>
using disjunction = typename ::std::conditional<P::value, P, Q>::type;

}  // namespace internal 
 
// When an unexpected function call is encountered, Google Mock will 
// let it return a default value if the user has specified one for its 
// return type, or if the return type has a built-in default value; 
// otherwise Google Mock won't know what value to return and will have 
// to abort the process. 
// 
// The DefaultValue<T> class allows a user to specify the 
// default value for a type T that is both copyable and publicly 
// destructible (i.e. anything that can be used as a function return 
// type).  The usage is: 
// 
//   // Sets the default value for type T to be foo. 
//   DefaultValue<T>::Set(foo); 
template <typename T> 
class DefaultValue { 
 public: 
  // Sets the default value for type T; requires T to be 
  // copy-constructable and have a public destructor. 
  static void Set(T x) { 
    delete producer_; 
    producer_ = new FixedValueProducer(x); 
  } 
 
  // Provides a factory function to be called to generate the default value. 
  // This method can be used even if T is only move-constructible, but it is not 
  // limited to that case. 
  typedef T (*FactoryFunction)(); 
  static void SetFactory(FactoryFunction factory) { 
    delete producer_; 
    producer_ = new FactoryValueProducer(factory); 
  } 
 
  // Unsets the default value for type T. 
  static void Clear() { 
    delete producer_; 
    producer_ = nullptr;
  } 
 
  // Returns true if and only if the user has set the default value for type T.
  static bool IsSet() { return producer_ != nullptr; }
 
  // Returns true if T has a default return value set by the user or there 
  // exists a built-in default value. 
  static bool Exists() { 
    return IsSet() || internal::BuiltInDefaultValue<T>::Exists(); 
  } 
 
  // Returns the default value for type T if the user has set one; 
  // otherwise returns the built-in default value. Requires that Exists() 
  // is true, which ensures that the return value is well-defined. 
  static T Get() { 
    return producer_ == nullptr ? internal::BuiltInDefaultValue<T>::Get()
                                : producer_->Produce();
  } 
 
 private: 
  class ValueProducer { 
   public: 
    virtual ~ValueProducer() {} 
    virtual T Produce() = 0; 
  }; 
 
  class FixedValueProducer : public ValueProducer { 
   public: 
    explicit FixedValueProducer(T value) : value_(value) {} 
    T Produce() override { return value_; }
 
   private: 
    const T value_; 
    GTEST_DISALLOW_COPY_AND_ASSIGN_(FixedValueProducer); 
  }; 
 
  class FactoryValueProducer : public ValueProducer { 
   public: 
    explicit FactoryValueProducer(FactoryFunction factory) 
        : factory_(factory) {} 
    T Produce() override { return factory_(); }
 
   private: 
    const FactoryFunction factory_; 
    GTEST_DISALLOW_COPY_AND_ASSIGN_(FactoryValueProducer); 
  }; 
 
  static ValueProducer* producer_; 
}; 
 
// This partial specialization allows a user to set default values for 
// reference types. 
template <typename T> 
class DefaultValue<T&> { 
 public: 
  // Sets the default value for type T&. 
  static void Set(T& x) {  // NOLINT 
    address_ = &x; 
  } 
 
  // Unsets the default value for type T&. 
  static void Clear() { address_ = nullptr; }
 
  // Returns true if and only if the user has set the default value for type T&.
  static bool IsSet() { return address_ != nullptr; }
 
  // Returns true if T has a default return value set by the user or there 
  // exists a built-in default value. 
  static bool Exists() { 
    return IsSet() || internal::BuiltInDefaultValue<T&>::Exists(); 
  } 
 
  // Returns the default value for type T& if the user has set one; 
  // otherwise returns the built-in default value if there is one; 
  // otherwise aborts the process. 
  static T& Get() { 
    return address_ == nullptr ? internal::BuiltInDefaultValue<T&>::Get()
                               : *address_;
  } 
 
 private: 
  static T* address_; 
}; 
 
// This specialization allows DefaultValue<void>::Get() to 
// compile. 
template <> 
class DefaultValue<void> { 
 public: 
  static bool Exists() { return true; } 
  static void Get() {} 
}; 
 
// Points to the user-set default value for type T. 
template <typename T> 
typename DefaultValue<T>::ValueProducer* DefaultValue<T>::producer_ = nullptr;
 
// Points to the user-set default value for type T&. 
template <typename T> 
T* DefaultValue<T&>::address_ = nullptr;
 
// Implement this interface to define an action for function type F. 
template <typename F> 
class ActionInterface { 
 public: 
  typedef typename internal::Function<F>::Result Result; 
  typedef typename internal::Function<F>::ArgumentTuple ArgumentTuple; 
 
  ActionInterface() {} 
  virtual ~ActionInterface() {} 
 
  // Performs the action.  This method is not const, as in general an 
  // action can have side effects and be stateful.  For example, a 
  // get-the-next-element-from-the-collection action will need to 
  // remember the current element. 
  virtual Result Perform(const ArgumentTuple& args) = 0; 
 
 private: 
  GTEST_DISALLOW_COPY_AND_ASSIGN_(ActionInterface); 
}; 
 
// An Action<F> is a copyable and IMMUTABLE (except by assignment) 
// object that represents an action to be taken when a mock function 
// of type F is called.  The implementation of Action<T> is just a 
// std::shared_ptr to const ActionInterface<T>. Don't inherit from Action!
// You can view an object implementing ActionInterface<F> as a 
// concrete action (including its current state), and an Action<F> 
// object as a handle to it. 
template <typename F> 
class Action { 
  // Adapter class to allow constructing Action from a legacy ActionInterface.
  // New code should create Actions from functors instead.
  struct ActionAdapter {
    // Adapter must be copyable to satisfy std::function requirements.
    ::std::shared_ptr<ActionInterface<F>> impl_;

    template <typename... Args>
    typename internal::Function<F>::Result operator()(Args&&... args) {
      return impl_->Perform(
          ::std::forward_as_tuple(::std::forward<Args>(args)...));
    }
  };

  template <typename G>
  using IsCompatibleFunctor = std::is_constructible<std::function<F>, G>;

 public: 
  typedef typename internal::Function<F>::Result Result; 
  typedef typename internal::Function<F>::ArgumentTuple ArgumentTuple; 
 
  // Constructs a null Action.  Needed for storing Action objects in 
  // STL containers. 
  Action() {}
 
  // Construct an Action from a specified callable.
  // This cannot take std::function directly, because then Action would not be
  // directly constructible from lambda (it would require two conversions).
  template <
      typename G,
      typename = typename std::enable_if<internal::disjunction<
          IsCompatibleFunctor<G>, std::is_constructible<std::function<Result()>,
                                                        G>>::value>::type>
  Action(G&& fun) {  // NOLINT
    Init(::std::forward<G>(fun), IsCompatibleFunctor<G>());
  }
 
  // Constructs an Action from its implementation.
  explicit Action(ActionInterface<F>* impl)
      : fun_(ActionAdapter{::std::shared_ptr<ActionInterface<F>>(impl)}) {}
 
  // This constructor allows us to turn an Action<Func> object into an 
  // Action<F>, as long as F's arguments can be implicitly converted 
  // to Func's and Func's return type can be implicitly converted to F's.
  template <typename Func> 
  explicit Action(const Action<Func>& action) : fun_(action.fun_) {}
 
  // Returns true if and only if this is the DoDefault() action.
  bool IsDoDefault() const { return fun_ == nullptr; }
 
  // Performs the action.  Note that this method is const even though 
  // the corresponding method in ActionInterface is not.  The reason 
  // is that a const Action<F> means that it cannot be re-bound to 
  // another concrete action, not that the concrete action it binds to 
  // cannot change state.  (Think of the difference between a const 
  // pointer and a pointer to const.) 
  Result Perform(ArgumentTuple args) const {
    if (IsDoDefault()) {
      internal::IllegalDoDefault(__FILE__, __LINE__);
    }
    return internal::Apply(fun_, ::std::move(args));
  } 
 
 private: 
  template <typename G>
  friend class Action;
 
  template <typename G>
  void Init(G&& g, ::std::true_type) {
    fun_ = ::std::forward<G>(g);
  }

  template <typename G>
  void Init(G&& g, ::std::false_type) {
    fun_ = IgnoreArgs<typename ::std::decay<G>::type>{::std::forward<G>(g)};
  }

  template <typename FunctionImpl>
  struct IgnoreArgs {
    template <typename... Args>
    Result operator()(const Args&...) const {
      return function_impl();
    }

    FunctionImpl function_impl;
  };

  // fun_ is an empty function if and only if this is the DoDefault() action.
  ::std::function<F> fun_;
}; 
 
// The PolymorphicAction class template makes it easy to implement a 
// polymorphic action (i.e. an action that can be used in mock 
// functions of than one type, e.g. Return()). 
// 
// To define a polymorphic action, a user first provides a COPYABLE 
// implementation class that has a Perform() method template: 
// 
//   class FooAction { 
//    public: 
//     template <typename Result, typename ArgumentTuple> 
//     Result Perform(const ArgumentTuple& args) const { 
//       // Processes the arguments and returns a result, using 
//       // std::get<N>(args) to get the N-th (0-based) argument in the tuple.
//     } 
//     ... 
//   }; 
// 
// Then the user creates the polymorphic action using 
// MakePolymorphicAction(object) where object has type FooAction.  See 
// the definition of Return(void) and SetArgumentPointee<N>(value) for 
// complete examples. 
template <typename Impl> 
class PolymorphicAction { 
 public: 
  explicit PolymorphicAction(const Impl& impl) : impl_(impl) {} 
 
  template <typename F> 
  operator Action<F>() const { 
    return Action<F>(new MonomorphicImpl<F>(impl_)); 
  } 
 
 private: 
  template <typename F> 
  class MonomorphicImpl : public ActionInterface<F> { 
   public: 
    typedef typename internal::Function<F>::Result Result; 
    typedef typename internal::Function<F>::ArgumentTuple ArgumentTuple; 
 
    explicit MonomorphicImpl(const Impl& impl) : impl_(impl) {} 
 
    Result Perform(const ArgumentTuple& args) override {
      return impl_.template Perform<Result>(args); 
    } 
 
   private: 
    Impl impl_; 
  }; 
 
  Impl impl_; 
}; 
 
// Creates an Action from its implementation and returns it.  The 
// created Action object owns the implementation. 
template <typename F> 
Action<F> MakeAction(ActionInterface<F>* impl) { 
  return Action<F>(impl); 
} 
 
// Creates a polymorphic action from its implementation.  This is 
// easier to use than the PolymorphicAction<Impl> constructor as it 
// doesn't require you to explicitly write the template argument, e.g. 
// 
//   MakePolymorphicAction(foo); 
// vs 
//   PolymorphicAction<TypeOfFoo>(foo); 
template <typename Impl> 
inline PolymorphicAction<Impl> MakePolymorphicAction(const Impl& impl) { 
  return PolymorphicAction<Impl>(impl); 
} 
 
namespace internal { 
 
// Helper struct to specialize ReturnAction to execute a move instead of a copy 
// on return. Useful for move-only types, but could be used on any type. 
template <typename T> 
struct ByMoveWrapper { 
  explicit ByMoveWrapper(T value) : payload(std::move(value)) {}
  T payload; 
}; 
 
// Implements the polymorphic Return(x) action, which can be used in 
// any function that returns the type of x, regardless of the argument 
// types. 
// 
// Note: The value passed into Return must be converted into 
// Function<F>::Result when this action is cast to Action<F> rather than 
// when that action is performed. This is important in scenarios like 
// 
// MOCK_METHOD1(Method, T(U)); 
// ... 
// { 
//   Foo foo; 
//   X x(&foo); 
//   EXPECT_CALL(mock, Method(_)).WillOnce(Return(x)); 
// } 
// 
// In the example above the variable x holds reference to foo which leaves 
// scope and gets destroyed.  If copying X just copies a reference to foo, 
// that copy will be left with a hanging reference.  If conversion to T 
// makes a copy of foo, the above code is safe. To support that scenario, we 
// need to make sure that the type conversion happens inside the EXPECT_CALL 
// statement, and conversion of the result of Return to Action<T(U)> is a 
// good place for that. 
// 
// The real life example of the above scenario happens when an invocation
// of gtl::Container() is passed into Return.
//
template <typename R> 
class ReturnAction { 
 public: 
  // Constructs a ReturnAction object from the value to be returned. 
  // 'value' is passed by value instead of by const reference in order 
  // to allow Return("string literal") to compile. 
  explicit ReturnAction(R value) : value_(new R(std::move(value))) {}
 
  // This template type conversion operator allows Return(x) to be 
  // used in ANY function that returns x's type. 
  template <typename F> 
  operator Action<F>() const {  // NOLINT
    // Assert statement belongs here because this is the best place to verify 
    // conditions on F. It produces the clearest error messages 
    // in most compilers. 
    // Impl really belongs in this scope as a local class but can't 
    // because MSVC produces duplicate symbols in different translation units 
    // in this case. Until MS fixes that bug we put Impl into the class scope 
    // and put the typedef both here (for use in assert statement) and 
    // in the Impl class. But both definitions must be the same. 
    typedef typename Function<F>::Result Result; 
    GTEST_COMPILE_ASSERT_( 
        !std::is_reference<Result>::value,
        use_ReturnRef_instead_of_Return_to_return_a_reference); 
    static_assert(!std::is_void<Result>::value,
                  "Can't use Return() on an action expected to return `void`.");
    return Action<F>(new Impl<R, F>(value_)); 
  } 
 
 private: 
  // Implements the Return(x) action for a particular function type F. 
  template <typename R_, typename F> 
  class Impl : public ActionInterface<F> { 
   public: 
    typedef typename Function<F>::Result Result; 
    typedef typename Function<F>::ArgumentTuple ArgumentTuple; 
 
    // The implicit cast is necessary when Result has more than one 
    // single-argument constructor (e.g. Result is std::vector<int>) and R 
    // has a type conversion operator template.  In that case, value_(value) 
    // won't compile as the compiler doesn't known which constructor of 
    // Result to call.  ImplicitCast_ forces the compiler to convert R to 
    // Result without considering explicit constructors, thus resolving the 
    // ambiguity. value_ is then initialized using its copy constructor. 
    explicit Impl(const std::shared_ptr<R>& value)
        : value_before_cast_(*value), 
          value_(ImplicitCast_<Result>(value_before_cast_)) {} 
 
    Result Perform(const ArgumentTuple&) override { return value_; }
 
   private: 
    GTEST_COMPILE_ASSERT_(!std::is_reference<Result>::value,
                          Result_cannot_be_a_reference_type); 
    // We save the value before casting just in case it is being cast to a 
    // wrapper type. 
    R value_before_cast_; 
    Result value_; 
 
    GTEST_DISALLOW_COPY_AND_ASSIGN_(Impl); 
  }; 
 
  // Partially specialize for ByMoveWrapper. This version of ReturnAction will 
  // move its contents instead. 
  template <typename R_, typename F> 
  class Impl<ByMoveWrapper<R_>, F> : public ActionInterface<F> { 
   public: 
    typedef typename Function<F>::Result Result; 
    typedef typename Function<F>::ArgumentTuple ArgumentTuple; 
 
    explicit Impl(const std::shared_ptr<R>& wrapper)
        : performed_(false), wrapper_(wrapper) {} 
 
    Result Perform(const ArgumentTuple&) override {
      GTEST_CHECK_(!performed_) 
          << "A ByMove() action should only be performed once."; 
      performed_ = true; 
      return std::move(wrapper_->payload);
    } 
 
   private: 
    bool performed_; 
    const std::shared_ptr<R> wrapper_;
  }; 
 
  const std::shared_ptr<R> value_;
}; 
 
// Implements the ReturnNull() action. 
class ReturnNullAction { 
 public: 
  // Allows ReturnNull() to be used in any pointer-returning function. In C++11 
  // this is enforced by returning nullptr, and in non-C++11 by asserting a 
  // pointer type on compile time. 
  template <typename Result, typename ArgumentTuple> 
  static Result Perform(const ArgumentTuple&) { 
    return nullptr; 
  } 
}; 
 
// Implements the Return() action. 
class ReturnVoidAction { 
 public: 
  // Allows Return() to be used in any void-returning function. 
  template <typename Result, typename ArgumentTuple> 
  static void Perform(const ArgumentTuple&) { 
    static_assert(std::is_void<Result>::value, "Result should be void.");
  } 
}; 
 
// Implements the polymorphic ReturnRef(x) action, which can be used 
// in any function that returns a reference to the type of x, 
// regardless of the argument types. 
template <typename T> 
class ReturnRefAction { 
 public: 
  // Constructs a ReturnRefAction object from the reference to be returned. 
  explicit ReturnRefAction(T& ref) : ref_(ref) {}  // NOLINT 
 
  // This template type conversion operator allows ReturnRef(x) to be 
  // used in ANY function that returns a reference to x's type. 
  template <typename F> 
  operator Action<F>() const { 
    typedef typename Function<F>::Result Result; 
    // Asserts that the function return type is a reference.  This 
    // catches the user error of using ReturnRef(x) when Return(x) 
    // should be used, and generates some helpful error message. 
    GTEST_COMPILE_ASSERT_(std::is_reference<Result>::value,
                          use_Return_instead_of_ReturnRef_to_return_a_value); 
    return Action<F>(new Impl<F>(ref_)); 
  } 
 
 private: 
  // Implements the ReturnRef(x) action for a particular function type F. 
  template <typename F> 
  class Impl : public ActionInterface<F> { 
   public: 
    typedef typename Function<F>::Result Result; 
    typedef typename Function<F>::ArgumentTuple ArgumentTuple; 
 
    explicit Impl(T& ref) : ref_(ref) {}  // NOLINT 
 
    Result Perform(const ArgumentTuple&) override { return ref_; }
 
   private: 
    T& ref_; 
  }; 
 
  T& ref_; 
}; 
 
// Implements the polymorphic ReturnRefOfCopy(x) action, which can be 
// used in any function that returns a reference to the type of x, 
// regardless of the argument types. 
template <typename T> 
class ReturnRefOfCopyAction { 
 public: 
  // Constructs a ReturnRefOfCopyAction object from the reference to 
  // be returned. 
  explicit ReturnRefOfCopyAction(const T& value) : value_(value) {}  // NOLINT 
 
  // This template type conversion operator allows ReturnRefOfCopy(x) to be 
  // used in ANY function that returns a reference to x's type. 
  template <typename F> 
  operator Action<F>() const { 
    typedef typename Function<F>::Result Result; 
    // Asserts that the function return type is a reference.  This 
    // catches the user error of using ReturnRefOfCopy(x) when Return(x) 
    // should be used, and generates some helpful error message. 
    GTEST_COMPILE_ASSERT_( 
        std::is_reference<Result>::value,
        use_Return_instead_of_ReturnRefOfCopy_to_return_a_value); 
    return Action<F>(new Impl<F>(value_)); 
  } 
 
 private: 
  // Implements the ReturnRefOfCopy(x) action for a particular function type F. 
  template <typename F> 
  class Impl : public ActionInterface<F> { 
   public: 
    typedef typename Function<F>::Result Result; 
    typedef typename Function<F>::ArgumentTuple ArgumentTuple; 
 
    explicit Impl(const T& value) : value_(value) {}  // NOLINT 
 
    Result Perform(const ArgumentTuple&) override { return value_; }
 
   private: 
    T value_; 
  }; 
 
  const T value_; 
};
 
// Implements the polymorphic ReturnRoundRobin(v) action, which can be
// used in any function that returns the element_type of v.
template <typename T>
class ReturnRoundRobinAction {
 public:
  explicit ReturnRoundRobinAction(std::vector<T> values) {
    GTEST_CHECK_(!values.empty())
        << "ReturnRoundRobin requires at least one element.";
    state_->values = std::move(values);
  }

  template <typename... Args>
  T operator()(Args&&...) const {
     return state_->Next();
  }

 private:
  struct State {
    T Next() {
      T ret_val = values[i++];
      if (i == values.size()) i = 0;
      return ret_val;
    }

    std::vector<T> values;
    size_t i = 0;
  };
  std::shared_ptr<State> state_ = std::make_shared<State>();
}; 
 
// Implements the polymorphic DoDefault() action. 
class DoDefaultAction { 
 public: 
  // This template type conversion operator allows DoDefault() to be 
  // used in any function. 
  template <typename F> 
  operator Action<F>() const { return Action<F>(); }  // NOLINT
}; 
 
// Implements the Assign action to set a given pointer referent to a 
// particular value. 
template <typename T1, typename T2> 
class AssignAction { 
 public: 
  AssignAction(T1* ptr, T2 value) : ptr_(ptr), value_(value) {} 
 
  template <typename Result, typename ArgumentTuple> 
  void Perform(const ArgumentTuple& /* args */) const { 
    *ptr_ = value_; 
  } 
 
 private: 
  T1* const ptr_; 
  const T2 value_; 
}; 
 
#if !GTEST_OS_WINDOWS_MOBILE 
 
// Implements the SetErrnoAndReturn action to simulate return from 
// various system calls and libc functions. 
template <typename T> 
class SetErrnoAndReturnAction { 
 public: 
  SetErrnoAndReturnAction(int errno_value, T result) 
      : errno_(errno_value), 
        result_(result) {} 
  template <typename Result, typename ArgumentTuple> 
  Result Perform(const ArgumentTuple& /* args */) const { 
    errno = errno_; 
    return result_; 
  } 
 
 private: 
  const int errno_; 
  const T result_; 
}; 
 
#endif  // !GTEST_OS_WINDOWS_MOBILE 
 
// Implements the SetArgumentPointee<N>(x) action for any function 
// whose N-th argument (0-based) is a pointer to x's type.
template <size_t N, typename A, typename = void>
struct SetArgumentPointeeAction {
  A value;
 
  template <typename... Args>
  void operator()(const Args&... args) const {
    *::std::get<N>(std::tie(args...)) = value;
  } 
}; 
 
// Implements the Invoke(object_ptr, &Class::Method) action.
template <class Class, typename MethodPtr>
struct InvokeMethodAction {
  Class* const obj_ptr;
  const MethodPtr method_ptr;
 
  template <typename... Args>
  auto operator()(Args&&... args) const
      -> decltype((obj_ptr->*method_ptr)(std::forward<Args>(args)...)) {
    return (obj_ptr->*method_ptr)(std::forward<Args>(args)...);
  } 
}; 
 
// Implements the InvokeWithoutArgs(f) action.  The template argument 
// FunctionImpl is the implementation type of f, which can be either a 
// function pointer or a functor.  InvokeWithoutArgs(f) can be used as an 
// Action<F> as long as f's type is compatible with F.
template <typename FunctionImpl> 
struct InvokeWithoutArgsAction {
  FunctionImpl function_impl;
 
  // Allows InvokeWithoutArgs(f) to be used as any action whose type is 
  // compatible with f. 
  template <typename... Args>
  auto operator()(const Args&...) -> decltype(function_impl()) {
    return function_impl();
  }
}; 
 
// Implements the InvokeWithoutArgs(object_ptr, &Class::Method) action. 
template <class Class, typename MethodPtr> 
struct InvokeMethodWithoutArgsAction {
  Class* const obj_ptr;
  const MethodPtr method_ptr;
 
  using ReturnType =
      decltype((std::declval<Class*>()->*std::declval<MethodPtr>())());

  template <typename... Args>
  ReturnType operator()(const Args&...) const {
    return (obj_ptr->*method_ptr)();
  } 
}; 
 
// Implements the IgnoreResult(action) action. 
template <typename A> 
class IgnoreResultAction { 
 public: 
  explicit IgnoreResultAction(const A& action) : action_(action) {} 
 
  template <typename F> 
  operator Action<F>() const { 
    // Assert statement belongs here because this is the best place to verify 
    // conditions on F. It produces the clearest error messages 
    // in most compilers. 
    // Impl really belongs in this scope as a local class but can't 
    // because MSVC produces duplicate symbols in different translation units 
    // in this case. Until MS fixes that bug we put Impl into the class scope 
    // and put the typedef both here (for use in assert statement) and 
    // in the Impl class. But both definitions must be the same. 
    typedef typename internal::Function<F>::Result Result; 
 
    // Asserts at compile time that F returns void. 
    static_assert(std::is_void<Result>::value, "Result type should be void.");
 
    return Action<F>(new Impl<F>(action_)); 
  } 
 
 private: 
  template <typename F> 
  class Impl : public ActionInterface<F> { 
   public: 
    typedef typename internal::Function<F>::Result Result; 
    typedef typename internal::Function<F>::ArgumentTuple ArgumentTuple; 
 
    explicit Impl(const A& action) : action_(action) {} 
 
    void Perform(const ArgumentTuple& args) override {
      // Performs the action and ignores its result. 
      action_.Perform(args); 
    } 
 
   private: 
    // Type OriginalFunction is the same as F except that its return 
    // type is IgnoredValue. 
    typedef typename internal::Function<F>::MakeResultIgnoredValue 
        OriginalFunction; 
 
    const Action<OriginalFunction> action_; 
  }; 
 
  const A action_; 
}; 
 
template <typename InnerAction, size_t... I>
struct WithArgsAction {
  InnerAction action;
 
  // The inner action could be anything convertible to Action<X>.
  // We use the conversion operator to detect the signature of the inner Action.
  template <typename R, typename... Args>
  operator Action<R(Args...)>() const {  // NOLINT
    using TupleType = std::tuple<Args...>;
    Action<R(typename std::tuple_element<I, TupleType>::type...)>
        converted(action);

    return [converted](Args... args) -> R {
      return converted.Perform(std::forward_as_tuple(
        std::get<I>(std::forward_as_tuple(std::forward<Args>(args)...))...));
    };
  }
}; 
 
template <typename... Actions>
struct DoAllAction {
 private:
  template <typename T>
  using NonFinalType =
      typename std::conditional<std::is_scalar<T>::value, T, const T&>::type;

  template <typename ActionT, size_t... I>
  std::vector<ActionT> Convert(IndexSequence<I...>) const {
    return {ActionT(std::get<I>(actions))...};
  }
 
 public: 
  std::tuple<Actions...> actions;
 
  template <typename R, typename... Args>
  operator Action<R(Args...)>() const {  // NOLINT
    struct Op {
      std::vector<Action<void(NonFinalType<Args>...)>> converted;
      Action<R(Args...)> last;
      R operator()(Args... args) const {
        auto tuple_args = std::forward_as_tuple(std::forward<Args>(args)...);
        for (auto& a : converted) {
          a.Perform(tuple_args);
        }
        return last.Perform(std::move(tuple_args));
      }
    };
    return Op{Convert<Action<void(NonFinalType<Args>...)>>(
                  MakeIndexSequence<sizeof...(Actions) - 1>()),
              std::get<sizeof...(Actions) - 1>(actions)};
  } 
}; 
 
template <typename T, typename... Params>
struct ReturnNewAction {
  T* operator()() const {
    return internal::Apply(
        [](const Params&... unpacked_params) {
          return new T(unpacked_params...);
        },
        params);
  }
  std::tuple<Params...> params;
};

template <size_t k>
struct ReturnArgAction {
  template <typename... Args>
  auto operator()(const Args&... args) const ->
      typename std::tuple_element<k, std::tuple<Args...>>::type {
    return std::get<k>(std::tie(args...));
  }
};

template <size_t k, typename Ptr>
struct SaveArgAction {
  Ptr pointer;

  template <typename... Args>
  void operator()(const Args&... args) const {
    *pointer = std::get<k>(std::tie(args...));
  }
};

template <size_t k, typename Ptr>
struct SaveArgPointeeAction {
  Ptr pointer;

  template <typename... Args>
  void operator()(const Args&... args) const {
    *pointer = *std::get<k>(std::tie(args...));
  }
};

template <size_t k, typename T>
struct SetArgRefereeAction {
  T value;

  template <typename... Args>
  void operator()(Args&&... args) const {
    using argk_type =
        typename ::std::tuple_element<k, std::tuple<Args...>>::type;
    static_assert(std::is_lvalue_reference<argk_type>::value,
                  "Argument must be a reference type.");
    std::get<k>(std::tie(args...)) = value;
  }
};

template <size_t k, typename I1, typename I2>
struct SetArrayArgumentAction {
  I1 first;
  I2 last;

  template <typename... Args>
  void operator()(const Args&... args) const {
    auto value = std::get<k>(std::tie(args...));
    for (auto it = first; it != last; ++it, (void)++value) {
      *value = *it;
    }
  }
};

template <size_t k>
struct DeleteArgAction {
  template <typename... Args>
  void operator()(const Args&... args) const {
    delete std::get<k>(std::tie(args...));
  }
};

template <typename Ptr>
struct ReturnPointeeAction {
  Ptr pointer;
  template <typename... Args>
  auto operator()(const Args&...) const -> decltype(*pointer) {
    return *pointer;
  }
};

#if GTEST_HAS_EXCEPTIONS
template <typename T>
struct ThrowAction {
  T exception;
  // We use a conversion operator to adapt to any return type.
  template <typename R, typename... Args>
  operator Action<R(Args...)>() const {  // NOLINT
    T copy = exception;
    return [copy](Args...) -> R { throw copy; };
  }
};
#endif  // GTEST_HAS_EXCEPTIONS

}  // namespace internal 
 
// An Unused object can be implicitly constructed from ANY value. 
// This is handy when defining actions that ignore some or all of the 
// mock function arguments.  For example, given 
// 
//   MOCK_METHOD3(Foo, double(const string& label, double x, double y)); 
//   MOCK_METHOD3(Bar, double(int index, double x, double y)); 
// 
// instead of 
// 
//   double DistanceToOriginWithLabel(const string& label, double x, double y) { 
//     return sqrt(x*x + y*y); 
//   } 
//   double DistanceToOriginWithIndex(int index, double x, double y) { 
//     return sqrt(x*x + y*y); 
//   } 
//   ... 
//   EXPECT_CALL(mock, Foo("abc", _, _))
//       .WillOnce(Invoke(DistanceToOriginWithLabel)); 
//   EXPECT_CALL(mock, Bar(5, _, _))
//       .WillOnce(Invoke(DistanceToOriginWithIndex)); 
// 
// you could write 
// 
//   // We can declare any uninteresting argument as Unused. 
//   double DistanceToOrigin(Unused, double x, double y) { 
//     return sqrt(x*x + y*y); 
//   } 
//   ... 
//   EXPECT_CALL(mock, Foo("abc", _, _)).WillOnce(Invoke(DistanceToOrigin));
//   EXPECT_CALL(mock, Bar(5, _, _)).WillOnce(Invoke(DistanceToOrigin));
typedef internal::IgnoredValue Unused; 
 
// Creates an action that does actions a1, a2, ..., sequentially in
// each invocation. All but the last action will have a readonly view of the
// arguments.
template <typename... Action>
internal::DoAllAction<typename std::decay<Action>::type...> DoAll(
    Action&&... action) {
  return {std::forward_as_tuple(std::forward<Action>(action)...)};
}
 
// WithArg<k>(an_action) creates an action that passes the k-th
// (0-based) argument of the mock function to an_action and performs
// it.  It adapts an action accepting one argument to one that accepts
// multiple arguments.  For convenience, we also provide
// WithArgs<k>(an_action) (defined below) as a synonym.
template <size_t k, typename InnerAction>
internal::WithArgsAction<typename std::decay<InnerAction>::type, k>
WithArg(InnerAction&& action) {
  return {std::forward<InnerAction>(action)};
}

// WithArgs<N1, N2, ..., Nk>(an_action) creates an action that passes
// the selected arguments of the mock function to an_action and
// performs it.  It serves as an adaptor between actions with
// different argument lists.
template <size_t k, size_t... ks, typename InnerAction>
internal::WithArgsAction<typename std::decay<InnerAction>::type, k, ks...>
WithArgs(InnerAction&& action) {
  return {std::forward<InnerAction>(action)};
}

// WithoutArgs(inner_action) can be used in a mock function with a
// non-empty argument list to perform inner_action, which takes no
// argument.  In other words, it adapts an action accepting no
// argument to one that accepts (and ignores) arguments.
template <typename InnerAction>
internal::WithArgsAction<typename std::decay<InnerAction>::type>
WithoutArgs(InnerAction&& action) {
  return {std::forward<InnerAction>(action)};
}

// Creates an action that returns 'value'.  'value' is passed by value 
// instead of const reference - otherwise Return("string literal") 
// will trigger a compiler error about using array as initializer. 
template <typename R> 
internal::ReturnAction<R> Return(R value) { 
  return internal::ReturnAction<R>(std::move(value));
} 
 
// Creates an action that returns NULL. 
inline PolymorphicAction<internal::ReturnNullAction> ReturnNull() { 
  return MakePolymorphicAction(internal::ReturnNullAction()); 
} 
 
// Creates an action that returns from a void function. 
inline PolymorphicAction<internal::ReturnVoidAction> Return() { 
  return MakePolymorphicAction(internal::ReturnVoidAction()); 
} 
 
// Creates an action that returns the reference to a variable. 
template <typename R> 
inline internal::ReturnRefAction<R> ReturnRef(R& x) {  // NOLINT 
  return internal::ReturnRefAction<R>(x); 
} 
 
// Prevent using ReturnRef on reference to temporary.
template <typename R, R* = nullptr>
internal::ReturnRefAction<R> ReturnRef(R&&) = delete;

// Creates an action that returns the reference to a copy of the 
// argument.  The copy is created when the action is constructed and 
// lives as long as the action. 
template <typename R> 
inline internal::ReturnRefOfCopyAction<R> ReturnRefOfCopy(const R& x) { 
  return internal::ReturnRefOfCopyAction<R>(x); 
} 
 
// Modifies the parent action (a Return() action) to perform a move of the 
// argument instead of a copy. 
// Return(ByMove()) actions can only be executed once and will assert this 
// invariant. 
template <typename R> 
internal::ByMoveWrapper<R> ByMove(R x) { 
  return internal::ByMoveWrapper<R>(std::move(x));
} 
 
// Creates an action that returns an element of `vals`. Calling this action will
// repeatedly return the next value from `vals` until it reaches the end and
// will restart from the beginning.
template <typename T>
internal::ReturnRoundRobinAction<T> ReturnRoundRobin(std::vector<T> vals) {
  return internal::ReturnRoundRobinAction<T>(std::move(vals));
}

// Creates an action that returns an element of `vals`. Calling this action will
// repeatedly return the next value from `vals` until it reaches the end and
// will restart from the beginning.
template <typename T>
internal::ReturnRoundRobinAction<T> ReturnRoundRobin(
    std::initializer_list<T> vals) {
  return internal::ReturnRoundRobinAction<T>(std::vector<T>(vals));
}

// Creates an action that does the default action for the give mock function. 
inline internal::DoDefaultAction DoDefault() { 
  return internal::DoDefaultAction(); 
} 
 
// Creates an action that sets the variable pointed by the N-th 
// (0-based) function argument to 'value'. 
template <size_t N, typename T> 
internal::SetArgumentPointeeAction<N, T> SetArgPointee(T value) {
  return {std::move(value)};
} 
 
// The following version is DEPRECATED. 
template <size_t N, typename T> 
internal::SetArgumentPointeeAction<N, T> SetArgumentPointee(T value) {
  return {std::move(value)};
} 
 
// Creates an action that sets a pointer referent to a given value. 
template <typename T1, typename T2> 
PolymorphicAction<internal::AssignAction<T1, T2> > Assign(T1* ptr, T2 val) { 
  return MakePolymorphicAction(internal::AssignAction<T1, T2>(ptr, val)); 
} 
 
#if !GTEST_OS_WINDOWS_MOBILE 
 
// Creates an action that sets errno and returns the appropriate error. 
template <typename T> 
PolymorphicAction<internal::SetErrnoAndReturnAction<T> > 
SetErrnoAndReturn(int errval, T result) { 
  return MakePolymorphicAction( 
      internal::SetErrnoAndReturnAction<T>(errval, result)); 
} 
 
#endif  // !GTEST_OS_WINDOWS_MOBILE 
 
// Various overloads for Invoke().
 
// Legacy function.
// Actions can now be implicitly constructed from callables. No need to create
// wrapper objects.
// This function exists for backwards compatibility.
template <typename FunctionImpl>
typename std::decay<FunctionImpl>::type Invoke(FunctionImpl&& function_impl) {
  return std::forward<FunctionImpl>(function_impl);
}

// Creates an action that invokes the given method on the given object
// with the mock function's arguments.
template <class Class, typename MethodPtr>
internal::InvokeMethodAction<Class, MethodPtr> Invoke(Class* obj_ptr,
                                                      MethodPtr method_ptr) {
  return {obj_ptr, method_ptr};
}

// Creates an action that invokes 'function_impl' with no argument. 
template <typename FunctionImpl> 
internal::InvokeWithoutArgsAction<typename std::decay<FunctionImpl>::type>
InvokeWithoutArgs(FunctionImpl function_impl) { 
  return {std::move(function_impl)};
} 
 
// Creates an action that invokes the given method on the given object 
// with no argument. 
template <class Class, typename MethodPtr> 
internal::InvokeMethodWithoutArgsAction<Class, MethodPtr> InvokeWithoutArgs(
    Class* obj_ptr, MethodPtr method_ptr) {
  return {obj_ptr, method_ptr};
} 
 
// Creates an action that performs an_action and throws away its 
// result.  In other words, it changes the return type of an_action to 
// void.  an_action MUST NOT return void, or the code won't compile. 
template <typename A> 
inline internal::IgnoreResultAction<A> IgnoreResult(const A& an_action) { 
  return internal::IgnoreResultAction<A>(an_action); 
} 
 
// Creates a reference wrapper for the given L-value.  If necessary, 
// you can explicitly specify the type of the reference.  For example, 
// suppose 'derived' is an object of type Derived, ByRef(derived) 
// would wrap a Derived&.  If you want to wrap a const Base& instead, 
// where Base is a base class of Derived, just write: 
// 
//   ByRef<const Base>(derived) 
//
// N.B. ByRef is redundant with std::ref, std::cref and std::reference_wrapper.
// However, it may still be used for consistency with ByMove().
template <typename T> 
inline ::std::reference_wrapper<T> ByRef(T& l_value) {  // NOLINT
  return ::std::reference_wrapper<T>(l_value);
} 
 
// The ReturnNew<T>(a1, a2, ..., a_k) action returns a pointer to a new
// instance of type T, constructed on the heap with constructor arguments
// a1, a2, ..., and a_k. The caller assumes ownership of the returned value.
template <typename T, typename... Params>
internal::ReturnNewAction<T, typename std::decay<Params>::type...> ReturnNew(
    Params&&... params) {
  return {std::forward_as_tuple(std::forward<Params>(params)...)};
}

// Action ReturnArg<k>() returns the k-th argument of the mock function.
template <size_t k>
internal::ReturnArgAction<k> ReturnArg() {
  return {};
}

// Action SaveArg<k>(pointer) saves the k-th (0-based) argument of the
// mock function to *pointer.
template <size_t k, typename Ptr>
internal::SaveArgAction<k, Ptr> SaveArg(Ptr pointer) {
  return {pointer};
}

// Action SaveArgPointee<k>(pointer) saves the value pointed to
// by the k-th (0-based) argument of the mock function to *pointer.
template <size_t k, typename Ptr>
internal::SaveArgPointeeAction<k, Ptr> SaveArgPointee(Ptr pointer) {
  return {pointer};
}

// Action SetArgReferee<k>(value) assigns 'value' to the variable
// referenced by the k-th (0-based) argument of the mock function.
template <size_t k, typename T>
internal::SetArgRefereeAction<k, typename std::decay<T>::type> SetArgReferee(
    T&& value) {
  return {std::forward<T>(value)};
}

// Action SetArrayArgument<k>(first, last) copies the elements in
// source range [first, last) to the array pointed to by the k-th
// (0-based) argument, which can be either a pointer or an
// iterator. The action does not take ownership of the elements in the
// source range.
template <size_t k, typename I1, typename I2>
internal::SetArrayArgumentAction<k, I1, I2> SetArrayArgument(I1 first,
                                                             I2 last) {
  return {first, last};
}

// Action DeleteArg<k>() deletes the k-th (0-based) argument of the mock
// function.
template <size_t k>
internal::DeleteArgAction<k> DeleteArg() {
  return {};
}

// This action returns the value pointed to by 'pointer'.
template <typename Ptr>
internal::ReturnPointeeAction<Ptr> ReturnPointee(Ptr pointer) {
  return {pointer};
}

// Action Throw(exception) can be used in a mock function of any type
// to throw the given exception.  Any copyable value can be thrown.
#if GTEST_HAS_EXCEPTIONS
template <typename T>
internal::ThrowAction<typename std::decay<T>::type> Throw(T&& exception) {
  return {std::forward<T>(exception)};
}
#endif  // GTEST_HAS_EXCEPTIONS

namespace internal {

// A macro from the ACTION* family (defined later in gmock-generated-actions.h)
// defines an action that can be used in a mock function.  Typically,
// these actions only care about a subset of the arguments of the mock
// function.  For example, if such an action only uses the second
// argument, it can be used in any mock function that takes >= 2
// arguments where the type of the second argument is compatible.
//
// Therefore, the action implementation must be prepared to take more
// arguments than it needs.  The ExcessiveArg type is used to
// represent those excessive arguments.  In order to keep the compiler
// error messages tractable, we define it in the testing namespace
// instead of testing::internal.  However, this is an INTERNAL TYPE
// and subject to change without notice, so a user MUST NOT USE THIS
// TYPE DIRECTLY.
struct ExcessiveArg {};

// Builds an implementation of an Action<> for some particular signature, using
// a class defined by an ACTION* macro.
template <typename F, typename Impl> struct ActionImpl;

template <typename Impl>
struct ImplBase {
  struct Holder {
    // Allows each copy of the Action<> to get to the Impl.
    explicit operator const Impl&() const { return *ptr; }
    std::shared_ptr<Impl> ptr;
  };
  using type = typename std::conditional<std::is_constructible<Impl>::value,
                                         Impl, Holder>::type;
};

template <typename R, typename... Args, typename Impl>
struct ActionImpl<R(Args...), Impl> : ImplBase<Impl>::type {
  using Base = typename ImplBase<Impl>::type;
  using function_type = R(Args...);
  using args_type = std::tuple<Args...>;

  ActionImpl() = default;  // Only defined if appropriate for Base.
  explicit ActionImpl(std::shared_ptr<Impl> impl) : Base{std::move(impl)} { }

  R operator()(Args&&... arg) const {
    static constexpr size_t kMaxArgs =
        sizeof...(Args) <= 10 ? sizeof...(Args) : 10;
    return Apply(MakeIndexSequence<kMaxArgs>{},
                 MakeIndexSequence<10 - kMaxArgs>{},
                 args_type{std::forward<Args>(arg)...});
  }

  template <std::size_t... arg_id, std::size_t... excess_id>
  R Apply(IndexSequence<arg_id...>, IndexSequence<excess_id...>,
          const args_type& args) const {
    // Impl need not be specific to the signature of action being implemented;
    // only the implementing function body needs to have all of the specific
    // types instantiated.  Up to 10 of the args that are provided by the
    // args_type get passed, followed by a dummy of unspecified type for the
    // remainder up to 10 explicit args.
    static constexpr ExcessiveArg kExcessArg{};
    return static_cast<const Impl&>(*this).template gmock_PerformImpl<
        /*function_type=*/function_type, /*return_type=*/R,
        /*args_type=*/args_type,
        /*argN_type=*/typename std::tuple_element<arg_id, args_type>::type...>(
        /*args=*/args, std::get<arg_id>(args)...,
        ((void)excess_id, kExcessArg)...);
  }
};

// Stores a default-constructed Impl as part of the Action<>'s
// std::function<>. The Impl should be trivial to copy.
template <typename F, typename Impl>
::testing::Action<F> MakeAction() {
  return ::testing::Action<F>(ActionImpl<F, Impl>());
}

// Stores just the one given instance of Impl.
template <typename F, typename Impl>
::testing::Action<F> MakeAction(std::shared_ptr<Impl> impl) {
  return ::testing::Action<F>(ActionImpl<F, Impl>(std::move(impl)));
}

#define GMOCK_INTERNAL_ARG_UNUSED(i, data, el) \
  , const arg##i##_type& arg##i GTEST_ATTRIBUTE_UNUSED_
#define GMOCK_ACTION_ARG_TYPES_AND_NAMES_UNUSED_           \
  const args_type& args GTEST_ATTRIBUTE_UNUSED_ GMOCK_PP_REPEAT( \
      GMOCK_INTERNAL_ARG_UNUSED, , 10)

#define GMOCK_INTERNAL_ARG(i, data, el) , const arg##i##_type& arg##i
#define GMOCK_ACTION_ARG_TYPES_AND_NAMES_ \
  const args_type& args GMOCK_PP_REPEAT(GMOCK_INTERNAL_ARG, , 10)

#define GMOCK_INTERNAL_TEMPLATE_ARG(i, data, el) , typename arg##i##_type
#define GMOCK_ACTION_TEMPLATE_ARGS_NAMES_ \
  GMOCK_PP_TAIL(GMOCK_PP_REPEAT(GMOCK_INTERNAL_TEMPLATE_ARG, , 10))

#define GMOCK_INTERNAL_TYPENAME_PARAM(i, data, param) , typename param##_type
#define GMOCK_ACTION_TYPENAME_PARAMS_(params) \
  GMOCK_PP_TAIL(GMOCK_PP_FOR_EACH(GMOCK_INTERNAL_TYPENAME_PARAM, , params))

#define GMOCK_INTERNAL_TYPE_PARAM(i, data, param) , param##_type
#define GMOCK_ACTION_TYPE_PARAMS_(params) \
  GMOCK_PP_TAIL(GMOCK_PP_FOR_EACH(GMOCK_INTERNAL_TYPE_PARAM, , params))

#define GMOCK_INTERNAL_TYPE_GVALUE_PARAM(i, data, param) \
  , param##_type gmock_p##i
#define GMOCK_ACTION_TYPE_GVALUE_PARAMS_(params) \
  GMOCK_PP_TAIL(GMOCK_PP_FOR_EACH(GMOCK_INTERNAL_TYPE_GVALUE_PARAM, , params))

#define GMOCK_INTERNAL_GVALUE_PARAM(i, data, param) \
  , std::forward<param##_type>(gmock_p##i)
#define GMOCK_ACTION_GVALUE_PARAMS_(params) \
  GMOCK_PP_TAIL(GMOCK_PP_FOR_EACH(GMOCK_INTERNAL_GVALUE_PARAM, , params))

#define GMOCK_INTERNAL_INIT_PARAM(i, data, param) \
  , param(::std::forward<param##_type>(gmock_p##i))
#define GMOCK_ACTION_INIT_PARAMS_(params) \
  GMOCK_PP_TAIL(GMOCK_PP_FOR_EACH(GMOCK_INTERNAL_INIT_PARAM, , params))

#define GMOCK_INTERNAL_FIELD_PARAM(i, data, param) param##_type param;
#define GMOCK_ACTION_FIELD_PARAMS_(params) \
  GMOCK_PP_FOR_EACH(GMOCK_INTERNAL_FIELD_PARAM, , params)

#define GMOCK_INTERNAL_ACTION(name, full_name, params)                        \
  template <GMOCK_ACTION_TYPENAME_PARAMS_(params)>                            \
  class full_name {                                                           \
   public:                                                                    \
    explicit full_name(GMOCK_ACTION_TYPE_GVALUE_PARAMS_(params))              \
        : impl_(std::make_shared<gmock_Impl>(                                 \
                GMOCK_ACTION_GVALUE_PARAMS_(params))) { }                     \
    full_name(const full_name&) = default;                                    \
    full_name(full_name&&) noexcept = default;                                \
    template <typename F>                                                     \
    operator ::testing::Action<F>() const {                                   \
      return ::testing::internal::MakeAction<F>(impl_);                       \
    }                                                                         \
   private:                                                                   \
    class gmock_Impl {                                                        \
     public:                                                                  \
      explicit gmock_Impl(GMOCK_ACTION_TYPE_GVALUE_PARAMS_(params))           \
          : GMOCK_ACTION_INIT_PARAMS_(params) {}                              \
      template <typename function_type, typename return_type,                 \
                typename args_type, GMOCK_ACTION_TEMPLATE_ARGS_NAMES_>        \
      return_type gmock_PerformImpl(GMOCK_ACTION_ARG_TYPES_AND_NAMES_) const; \
      GMOCK_ACTION_FIELD_PARAMS_(params)                                      \
    };                                                                        \
    std::shared_ptr<const gmock_Impl> impl_;                                  \
  };                                                                          \
  template <GMOCK_ACTION_TYPENAME_PARAMS_(params)>                            \
  inline full_name<GMOCK_ACTION_TYPE_PARAMS_(params)> name(                   \
      GMOCK_ACTION_TYPE_GVALUE_PARAMS_(params)) {                             \
    return full_name<GMOCK_ACTION_TYPE_PARAMS_(params)>(                      \
        GMOCK_ACTION_GVALUE_PARAMS_(params));                                 \
  }                                                                           \
  template <GMOCK_ACTION_TYPENAME_PARAMS_(params)>                            \
  template <typename function_type, typename return_type, typename args_type, \
            GMOCK_ACTION_TEMPLATE_ARGS_NAMES_>                                \
  return_type full_name<GMOCK_ACTION_TYPE_PARAMS_(params)>::gmock_Impl::      \
  gmock_PerformImpl(GMOCK_ACTION_ARG_TYPES_AND_NAMES_UNUSED_) const

}  // namespace internal

// Similar to GMOCK_INTERNAL_ACTION, but no bound parameters are stored.
#define ACTION(name)                                                          \
  class name##Action {                                                        \
   public:                                                                    \
   explicit name##Action() noexcept {}                                        \
   name##Action(const name##Action&) noexcept {}                              \
    template <typename F>                                                     \
    operator ::testing::Action<F>() const {                                   \
      return ::testing::internal::MakeAction<F, gmock_Impl>();                \
    }                                                                         \
   private:                                                                   \
    class gmock_Impl {                                                        \
     public:                                                                  \
      template <typename function_type, typename return_type,                 \
                typename args_type, GMOCK_ACTION_TEMPLATE_ARGS_NAMES_>        \
      return_type gmock_PerformImpl(GMOCK_ACTION_ARG_TYPES_AND_NAMES_) const; \
    };                                                                        \
  };                                                                          \
  inline name##Action name() GTEST_MUST_USE_RESULT_;                          \
  inline name##Action name() { return name##Action(); }                       \
  template <typename function_type, typename return_type, typename args_type, \
            GMOCK_ACTION_TEMPLATE_ARGS_NAMES_>                                \
  return_type name##Action::gmock_Impl::gmock_PerformImpl(                    \
      GMOCK_ACTION_ARG_TYPES_AND_NAMES_UNUSED_) const

#define ACTION_P(name, ...) \
  GMOCK_INTERNAL_ACTION(name, name##ActionP, (__VA_ARGS__))

#define ACTION_P2(name, ...) \
  GMOCK_INTERNAL_ACTION(name, name##ActionP2, (__VA_ARGS__))

#define ACTION_P3(name, ...) \
  GMOCK_INTERNAL_ACTION(name, name##ActionP3, (__VA_ARGS__))

#define ACTION_P4(name, ...) \
  GMOCK_INTERNAL_ACTION(name, name##ActionP4, (__VA_ARGS__))

#define ACTION_P5(name, ...) \
  GMOCK_INTERNAL_ACTION(name, name##ActionP5, (__VA_ARGS__))

#define ACTION_P6(name, ...) \
  GMOCK_INTERNAL_ACTION(name, name##ActionP6, (__VA_ARGS__))

#define ACTION_P7(name, ...) \
  GMOCK_INTERNAL_ACTION(name, name##ActionP7, (__VA_ARGS__))

#define ACTION_P8(name, ...) \
  GMOCK_INTERNAL_ACTION(name, name##ActionP8, (__VA_ARGS__))

#define ACTION_P9(name, ...) \
  GMOCK_INTERNAL_ACTION(name, name##ActionP9, (__VA_ARGS__))

#define ACTION_P10(name, ...) \
  GMOCK_INTERNAL_ACTION(name, name##ActionP10, (__VA_ARGS__))

}  // namespace testing 
 
#ifdef _MSC_VER
# pragma warning(pop)
#endif

#endif  // GOOGLEMOCK_INCLUDE_GMOCK_GMOCK_ACTIONS_H_