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#pragma once
#include "typetraits.h"
#include "typelist.h"
#include <functional>
namespace NPrivate {
template <class F>
struct TRemoveClassImpl {
using TSignature = F;
};
template <typename C, typename R, typename... Args>
struct TRemoveClassImpl<R (C::*)(Args...)> {
typedef R TSignature(Args...);
};
template <typename C, typename R, typename... Args>
struct TRemoveClassImpl<R (C::*)(Args...) const> {
typedef R TSignature(Args...);
};
template <class T>
struct TRemoveNoExceptImpl {
using Type = T;
};
template <typename R, typename... Args>
struct TRemoveNoExceptImpl<R(Args...) noexcept> {
using Type = R(Args...);
};
template <typename R, typename C, typename... Args>
struct TRemoveNoExceptImpl<R (C::*)(Args...) noexcept> {
using Type = R (C::*)(Args...);
};
template <class T>
using TRemoveNoExcept = typename TRemoveNoExceptImpl<T>::Type;
template <class F>
using TRemoveClass = typename TRemoveClassImpl<TRemoveNoExcept<F>>::TSignature;
template <class C>
struct TFuncInfo {
using TSignature = TRemoveClass<decltype(&C::operator())>;
};
template <class R, typename... Args>
struct TFuncInfo<R(Args...)> {
using TResult = R;
typedef R TSignature(Args...);
};
}
template <class C>
using TFunctionSignature = typename ::NPrivate::TFuncInfo<::NPrivate::TRemoveClass<std::remove_reference_t<std::remove_pointer_t<C>>>>::TSignature;
template <typename F>
struct TCallableTraits: public TCallableTraits<TFunctionSignature<F>> {
};
template <typename R, typename... Args>
struct TCallableTraits<R(Args...)> {
using TResult = R;
using TArgs = TTypeList<Args...>;
typedef R TSignature(Args...);
};
template <typename C>
using TFunctionResult = typename TCallableTraits<C>::TResult;
template <typename C>
using TFunctionArgs = typename TCallableTraits<C>::TArgs;
template <typename C, size_t N>
struct TFunctionArgImpl {
using TArgs = TFunctionArgs<C>;
using TResult = typename TArgs::template TGet<N>;
};
template <typename C, size_t N>
using TFunctionArg = typename TFunctionArgImpl<C, N>::TResult;
// temporary before std::apply appearance
template <typename F, typename Tuple, size_t... I>
auto ApplyImpl(F&& f, Tuple&& t, std::index_sequence<I...>) {
return f(std::get<I>(std::forward<Tuple>(t))...);
}
// change to std::apply after c++ 17
template <typename F, typename Tuple>
auto Apply(F&& f, Tuple&& t) {
return ApplyImpl(f, t, std::make_index_sequence<std::tuple_size<std::decay_t<Tuple>>::value>{});
}
// change to std::apply after c++ 17
template <typename F>
auto Apply(F&& f, std::tuple<>) {
return f();
}
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