from_delay_delete.hpp

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#pragma once
 
#include <concepts>
#include <memory/from_allocator.hpp>
#include <memory>
 
namespace from {
using delay_deleter = void (*)(void*);
 
LIBERAPI void request_delete(delay_deleter deleter, void* p);
 
template <typename T>
struct delay_delete {
    constexpr delay_delete() noexcept = default;
 
    template <typename U>
        requires std::convertible_to<U*, T*>
    delay_delete(const delay_delete<U>&) noexcept {}
 
    void operator()(T* p) const noexcept {
        request_delete(&delay_deleter, static_cast<void*>(p));
    }
 
private:
    static void delay_deleter(void* p) {
        T* target = reinterpret_cast<T*>(p);
        auto allocator = get_allocator_of(target);
        using altraits = std::allocator_traits<decltype(allocator)>;
        altraits::destroy(allocator, target);
        altraits::deallocate(allocator, target, 1);
    }
};
} // namespace from