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#pragma once
#include "borrowed-ptr-fwd.hpp"
#include <compare>
#define FM_BPTR_DEBUG
#ifdef __CLION_IDE__
#define fm_bptr_assert(...) (void(__VA_ARGS__))
#elif defined FM_BPTR_DEBUG && !defined FM_NO_DEBUG
#define fm_bptr_assert(...) fm_assert(__VA_ARGS__)
#else
#define fm_bptr_assert(...) void()
#endif
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;
};
} // namespace floormat
namespace floormat::detail_bptr {
struct control_block final
{
bptr_base* _ptr;
uint32_t _soft_count, _hard_count;
static void decrement(control_block*& blk) noexcept;
static void weak_decrement(control_block*& blk) noexcept;
};
template<typename From, typename To>
concept StaticCastable = requires(From* from, To* to) {
static_cast<To*>(from);
static_cast<const bptr_base*>(from);
static_cast<const bptr_base*>(to);
};
template<typename From, typename To>
concept DerivedFrom = requires(From* from, To* to) {
requires std::is_convertible_v<From&, To&>;
};
} // namespace floormat::detail_bptr
namespace floormat {
template<typename T>
class bptr final // NOLINT(*-special-member-functions)
{
detail_bptr::control_block* blk;
template<typename Y> bptr(const bptr<Y>& other, std::nullptr_t) noexcept;
template<typename Y> bptr(bptr<Y>&& other, std::nullptr_t) noexcept;
template<typename Y> bptr& _copy_assign(const bptr<Y>& other) 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&&...>
explicit bptr(InPlaceInitT, Ts&&... args) noexcept;
template<detail_bptr::DerivedFrom<T> Y> explicit bptr(Y* ptr) noexcept;
bptr() noexcept;
~bptr() noexcept;
bptr(std::nullptr_t) noexcept; // NOLINT(*-explicit-conversions)
bptr& operator=(std::nullptr_t) noexcept;
bptr(const bptr<std::remove_const_t<T>>& ptr) noexcept requires std::is_const_v<T>;
bptr(bptr<std::remove_const_t<T>>&& ptr) noexcept requires std::is_const_v<T>;
bptr(const bptr&) noexcept;
bptr& operator=(const bptr&) noexcept;
template<detail_bptr::DerivedFrom<T> Y> bptr(const bptr<Y>&) noexcept;
template<detail_bptr::DerivedFrom<T> Y> bptr& operator=(const bptr<Y>&) noexcept;
bptr(bptr&&) noexcept;
bptr& operator=(bptr&&) noexcept;
template<detail_bptr::DerivedFrom<T> Y> bptr(bptr<Y>&&) noexcept;
template<detail_bptr::DerivedFrom<T> Y> bptr& operator=(bptr<Y>&&) noexcept;
void reset() noexcept;
template<detail_bptr::DerivedFrom<T> Y> void reset(Y* ptr) 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 T>& other) const noexcept;
bool operator==(const bptr<T>& other) const noexcept requires (!std::is_const_v<T>);
bool operator==(const std::nullptr_t& other) const noexcept;
std::strong_ordering operator<=>(const bptr<const T>& other) const noexcept;
template<typename U> friend class bptr;
template<typename U> friend class weak_bptr;
template<typename To, typename From>
requires detail_bptr::StaticCastable<From, To>
friend bptr<To> static_pointer_cast(bptr<From>&& p) noexcept;
template<typename To, typename From>
requires detail_bptr::StaticCastable<From, To>
friend bptr<To> static_pointer_cast(const bptr<From>& p) noexcept;
};
template<typename T> bptr<T>::bptr(std::nullptr_t) noexcept: blk{nullptr} {}
template<typename To, typename From>
requires detail_bptr::StaticCastable<From, To>
bptr<To> static_pointer_cast(bptr<From>&& p) noexcept
{
if (p.blk && p.blk->_ptr) [[likely]]
{
bptr<To> ret{nullptr};
ret.blk = p.blk;
p.blk = nullptr;
return ret;
}
return bptr<To>{nullptr};
}
template<typename To, typename From>
requires detail_bptr::StaticCastable<From, To>
bptr<To> static_pointer_cast(const bptr<From>& p) noexcept
{
if (p.blk && p.blk->_ptr) [[likely]]
{
bptr<To> ret{nullptr};
++p.blk->_soft_count;
++p.blk->_hard_count;
ret.blk = p.blk;
return ret;
}
return bptr<To>{nullptr};
}
} // namespace floormat
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