piecewise_construct.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2019 Tobias Hienzsch
 
#ifndef TETL_UTILITY_PIECEWISE_CONSTRUCT_HPP
#define TETL_UTILITY_PIECEWISE_CONSTRUCT_HPP
 
#include <etl/_cstddef/size_t.hpp>
 
namespace etl {
 
/// \brief etl::piecewise_construct_t is an empty class tag type used to
/// disambiguate between different functions that take two tuple arguments.
///
/// \details The overloads that do not use etl::piecewise_construct_t assume
/// that each tuple argument becomes the element of a pair. The overloads that
/// use etl::piecewise_construct_t assume that each tuple argument is used to
/// construct, piecewise, a new object of specified type, which will become the
/// element of the pair.
///
/// https://en.cppreference.com/w/cpp/utility/piecewise_construct_t
struct piecewise_construct_t {
    explicit piecewise_construct_t() = default;
};
 
/// \brief The constant etl::piecewise_construct is an instance of an empty
/// struct tag type etl::piecewise_construct_t.
inline constexpr auto piecewise_construct = piecewise_construct_t{};
 
} // namespace etl
 
#endif // TETL_UTILITY_PIECEWISE_CONSTRUCT_HPP