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#pragma once
#include "borrowed-ptr-fwd.hpp"
namespace floormat::detail_borrowed_ptr {
struct control_block;
template<typename From, typename To>
concept StaticCastable = requires(From* from) {
static_cast<To*>(from);
};
template<typename From, typename To>
concept DerivedFrom = requires(From* x) {
!std::is_same_v<From, To>;
std::is_convertible_v<From*, To*>;
};
} // namespace floormat::detail_borrowed_ptr
namespace floormat {
struct bptr_base
{
virtual ~bptr_base() noexcept;
bptr_base() noexcept;
bptr_base(const bptr_base&) noexcept;
bptr_base(bptr_base&&) noexcept;
bptr_base& operator=(const bptr_base&) noexcept;
bptr_base& operator=(bptr_base&&) noexcept;
};
template<typename T>
class bptr final // NOLINT(*-special-member-functions)
{
detail_borrowed_ptr::control_block* blk;
template<typename Y>
requires std::is_convertible_v<T*, const bptr_base*>
bptr(const bptr<Y>& other, std::nullptr_t) noexcept;
template<typename Y> bptr& _copy_assign(const bptr<Y>& other) noexcept;
template<typename Y>
requires std::is_convertible_v<T*, const bptr_base*>
bptr(bptr<Y>&& other, std::nullptr_t) noexcept;
template<typename Y> bptr& _move_assign(bptr<Y>&& other) noexcept;
public:
template<typename... Ts>
requires (std::is_constructible_v<std::remove_const_t<T>, Ts&&...> && std::is_convertible_v<T*, const bptr_base*>)
explicit bptr(InPlaceInitT, Ts&&... args) noexcept;
explicit bptr(T* ptr) noexcept requires std::is_convertible_v<T*, const bptr_base*>;
bptr() noexcept requires std::is_convertible_v<T*, const bptr_base*>;
~bptr() noexcept;
bptr(std::nullptr_t) noexcept requires std::is_convertible_v<T*, const bptr_base*>; // NOLINT(*-explicit-conversions)
bptr& operator=(std::nullptr_t) noexcept requires std::is_convertible_v<T*, const bptr_base*>;
bptr(const bptr&) noexcept requires std::is_convertible_v<T*, const bptr_base*>;
bptr& operator=(const bptr&) noexcept requires std::is_convertible_v<T*, const bptr_base*>;
template<detail_borrowed_ptr::DerivedFrom<T> Y> bptr(const bptr<Y>&) noexcept
requires std::is_convertible_v<T*, const bptr_base*>;
template<detail_borrowed_ptr::DerivedFrom<T> Y> bptr& operator=(const bptr<Y>&) noexcept
requires std::is_convertible_v<T*, const bptr_base*>;
bptr(bptr&&) noexcept requires std::is_convertible_v<T*, const bptr_base*>;
bptr& operator=(bptr&&) noexcept requires std::is_convertible_v<T*, const bptr_base*>;
template<detail_borrowed_ptr::DerivedFrom<T> Y> bptr(bptr<Y>&&) noexcept
requires std::is_convertible_v<T*, const bptr_base*>;
template<detail_borrowed_ptr::DerivedFrom<T> Y> bptr& operator=(bptr<Y>&&) noexcept
requires std::is_convertible_v<T*, const bptr_base*>;
void reset() noexcept;
void destroy() noexcept;
void swap(bptr& other) noexcept;
uint32_t use_count() const noexcept;
T* get() const noexcept;
T* operator->() const noexcept;
T& operator*() const noexcept;
explicit operator bool() const noexcept;
bool operator==(const bptr<const std::remove_const_t<T>>& other) const noexcept;
bool operator==(const bptr<std::remove_const_t<T>>& other) const noexcept;
template<typename U> friend class bptr;
template<typename To, typename From>
requires (std::is_convertible_v<To*, const bptr_base*> && detail_borrowed_ptr::StaticCastable<From, To>)
friend bptr<To> static_pointer_cast(const bptr<From>& p) noexcept;
};
template<typename To, typename From>
requires (std::is_convertible_v<To*, const bptr_base*> && detail_borrowed_ptr::StaticCastable<From, To>)
bptr<To> static_pointer_cast(const bptr<From>& p) noexcept
{
if (p.blk && p.blk->_ptr) [[likely]]
return bptr<To>{p, nullptr};
return bptr<To>{nullptr};
}
} // namespace floormat
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