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#pragma once
#include <utility>
#include "ptr.h"
template <class TBase, class TCounter>
struct TWithRefCount: public TBase, public TRefCounted<TWithRefCount<TBase, TCounter>, TCounter> {
using TBase::TBase;
};
template <class T>
struct TPtrPolicy {
inline TPtrPolicy(T* t Y_LIFETIME_BOUND)
: T_(t)
{
}
inline T* Ptr() noexcept {
return T_;
}
inline const T* Ptr() const noexcept {
return T_;
}
T* T_;
};
template <class T>
struct TEmbedPolicy {
template <typename... Args, typename = typename std::enable_if<std::is_constructible<T, Args...>::value>::type>
inline TEmbedPolicy(Args&&... args)
: T_(std::forward<Args>(args)...)
{
}
inline T* Ptr() noexcept {
return &T_;
}
inline const T* Ptr() const noexcept {
return &T_;
}
T T_;
};
template <class T, class TCounter>
struct TRefPolicy {
using THelper = TWithRefCount<T, TCounter>;
template <typename... Args, typename = typename std::enable_if<std::is_constructible<T, Args...>::value>::type>
inline TRefPolicy(Args&&... args)
: T_(new THelper(std::forward<Args>(args)...))
{
}
inline T* Ptr() noexcept {
return T_.Get();
}
inline const T* Ptr() const noexcept {
return T_.Get();
}
TIntrusivePtr<THelper> T_;
};
/**
* Storage class that can be handy for implementing proxies / adaptors that can
* accept both lvalues and rvalues. In the latter case it's often required to
* extend the lifetime of the passed rvalue, and the only option is to store it
* in your proxy / adaptor.
*
* Example usage:
* \code
* template<class T>
* struct TProxy {
* TAutoEmbedOrPtrPolicy<T> Value_;
* // Your proxy code...
* };
*
* template<class T>
* TProxy<T> MakeProxy(T&& value) {
* // Rvalues are automagically moved-from, and stored inside the proxy.
* return {std::forward<T>(value)};
* }
* \endcode
*
* Look at `Reversed` in `adaptor.h` for real example.
*/
template <class T, bool IsReference = std::is_reference<T>::value>
struct TAutoEmbedOrPtrPolicy: TPtrPolicy<std::remove_reference_t<T>> {
using TBase = TPtrPolicy<std::remove_reference_t<T>>;
TAutoEmbedOrPtrPolicy(T& reference Y_LIFETIME_BOUND)
: TBase(&reference)
{
}
};
template <class T>
struct TAutoEmbedOrPtrPolicy<T, false>: TEmbedPolicy<T> {
using TBase = TEmbedPolicy<T>;
TAutoEmbedOrPtrPolicy(T&& object)
: TBase(std::move(object))
{
}
};
template <class T>
using TAtomicRefPolicy = TRefPolicy<T, TAtomicCounter>;
template <class T>
using TSimpleRefPolicy = TRefPolicy<T, TSimpleCounter>;
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