allocate_one.h

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#pragma once
 
#include "di/container/allocator/allocate.h"
#include "di/container/allocator/allocation_result.h"
#include "di/container/allocator/allocator.h"
#include "di/container/allocator/std_allocator.h"
#include "di/meta/vocab.h"
#include "di/vocab/expected/as_fallible.h"
#include "di/vocab/expected/try_infallible.h"
 
namespace di::container {
namespace detail {
    template<typename T>
    struct AllocateOneFunction {
        template<concepts::Allocator Alloc>
        constexpr auto operator()(Alloc& allocator) const -> meta::AllocatorResult<Alloc, T*> {
            if consteval {
                return std::allocator<T>().allocate(1);
            }
 
            return vocab::as_fallible(di::allocate(allocator, sizeof(T), alignof(T))) % [](AllocationResult<> result) {
                return static_cast<T*>(result.data);
            } | vocab::try_infallible;
        }
    };
}
 
template<typename T>
constexpr inline auto allocate_one = detail::AllocateOneFunction<T> {};
}
 
namespace di {
using container::allocate_one;
}