///////////////////////////////////////////////////////////////////////////////
// Reference implementation of std::generator proposal P2168.
//
// See https://wg21.link/P2168 for details.
//
///////////////////////////////////////////////////////////////////////////////
// Copyright Lewis Baker, Corentin Jabot
//
// Use, modification and distribution is subject to the Boost Software License,
// Version 1.0.
// (See accompanying file LICENSE or http://www.boost.org/LICENSE_1_0.txt)
///////////////////////////////////////////////////////////////////////////////

module;

#include <concepts>
#include <memory>

export module nihil.generator:util;

namespace nihil {

export struct use_allocator_arg {};

template <typename Alloc>
constexpr bool allocator_needs_to_be_stored =
	!std::allocator_traits<Alloc>::is_always_equal::value ||
	!std::is_default_constructible_v<Alloc>;

// Round s up to next multiple of a.
[[nodiscard]] constexpr auto
aligned_allocation_size(std::size_t s, std::size_t a) -> std::size_t
{
	return (s + a - 1) & ~(a - 1);
}

} // namespace nihil