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#pragma once
#include "compat/assert.hpp"
#include "borrowed-ptr.hpp"
namespace floormat::detail_borrowed_ptr {
#ifdef __GNUG__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
#endif
struct control_block_
{
explicit control_block_(void* ptr) noexcept;
~control_block_() noexcept;
void incr() noexcept;
void decr() noexcept;
uint32_t count() const noexcept;
void* _ptr; // todo maybe add directly embeddable objects?
uint32_t _count;
private:
virtual void free() noexcept = 0;
};
#ifdef __GNUG__
#pragma GCC diagnostic pop
#endif
template<typename T>
struct control_block final: control_block_
{
void free() noexcept override;
[[nodiscard]] static control_block_* create(T* ptr) noexcept;
protected:
explicit control_block(T* ptr) noexcept;
};
template <typename T>
control_block<T>::control_block(T* ptr) noexcept:
control_block_{ptr}
{
fm_debug_assert(ptr);
}
template <typename T>
void control_block<T>::free() noexcept
{
delete static_cast<T*>(_ptr);
}
template <typename T>
control_block_* control_block<T>::create(T* ptr) noexcept
{
return ptr ? new control_block<T>{ptr} : nullptr;
}
} // namespace floormat::detail_borrowed_ptr
namespace floormat {
template<typename T>
template<typename... Ts>
requires std::is_constructible_v<T, Ts&&...>
bptr<T>::bptr(InPlaceInitT, Ts&&... args) noexcept:
bptr{ new T{ forward<Ts...>(args...) } }
{
}
template<typename T>
bptr<T>::bptr(T* ptr) noexcept:
ptr{ptr},
blk{detail_borrowed_ptr::control_block<T>::create(ptr)}
{
}
template<typename T>
bptr<T>::~bptr() noexcept
{
if (blk)
blk->decr();
//blk = reinterpret_cast<T*>(-1);
}
template<typename T>
template<typename Y>
requires std::is_convertible_v<Y*, T*>
bptr<T>::bptr(const bptr<Y>& other) noexcept:
ptr{other.ptr}, blk{other.blk}
{
static_assert(std::is_convertible_v<Y*, T*>);
if (blk)
blk->incr();
else
fm_debug_assert(!ptr);
}
template<typename T>
template<typename Y>
requires std::is_convertible_v<Y*, T*>
bptr<T>::bptr(bptr<Y>&& other) noexcept: ptr{other.ptr}, blk{other.blk}
{
other.ptr = nullptr;
other.blk = nullptr;
}
template<typename T>
template<typename Y>
requires std::is_convertible_v<Y*, T*>
bptr<T>& bptr<T>::operator=(const bptr<Y>& other) noexcept
{
static_assert(std::is_convertible_v<Y*, T*>);
auto* const newblk = other.blk;
if (blk != newblk)
{
CORRADE_ASSUME(this != &other);
ptr = other.ptr;
if (blk)
blk->decr();
blk = newblk;
if (newblk)
newblk->incr();
}
return *this;
}
template<typename T>
template<typename Y>
requires std::is_convertible_v<Y*, T*>
bptr<T>& bptr<T>::operator=(bptr<Y>&& other) noexcept
{
ptr = other.ptr;
blk = other.blk;
other.ptr = nullptr;
other.blk = nullptr;
return *this;
}
template<typename T, typename U>
bptr<T> static_pointer_cast(const bptr<U>& p)
{
auto ret = bptr<T>{};
ret.blk = p.blk;
if (ret.blk) [[likely]]
ret.blk->incr();
ret.ptr = static_cast<T*>(p.ptr);
return ret;
}
} // namespace floormat
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