unused.hpp

//  _    _                          _    _____
// | |  | |                        | |  / ____|_     _
// | |  | |_ __  _   _ ___  ___  __| | | |   _| |_ _| |_
// | |  | | '_ \| | | / __|/ _ \/ _` | | |  |_   _|_   _|
// | |__| | | | | |_| \__ \  __/ (_| | | |____|_|   |_|
//  \____/|_| |_|\__,_|___/\___|\__,_|  \_____|
//
// Licensed under the MIT License <http://opensource.org/licenses/MIT>.
// SPDX-License-Identifier: MIT
// Copyright (c) 2018 - 2024 Daniil Goncharov <neargye@gmail.com>.
//
// Permission is hereby  granted, free of charge, to any  person obtaining a copy
// of this software and associated  documentation files (the "Software"), to deal
// in the Software  without restriction, including without  limitation the rights
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// copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
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//
// THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
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#ifndef NEARGYE_NSTD_UNUSED_HPP
#define NEARGYE_NSTD_UNUSED_HPP

namespace nstd {

// Function with varying number of arguments to avoid "unused variable" warnings.
template <typename... Args>
#if defined(__cpp_constexpr) && __cpp_constexpr >= 201304L
constexpr
#else
inline
#endif
void unused(const Args&...) noexcept {}

} // namespace nstd

#if defined(_MSC_VER)
// Macro with varying number of arguments to avoid "unused variable" warnings.
#  define NSTD_UNUSED(...) ((void)(__VA_ARGS__))
#else
// Macro with varying number of arguments to avoid "unused variable" warnings.
#  define NSTD_UNUSED(...) (decltype(::nstd::unused(__VA_ARGS__))())
#endif

#endif // NEARGYE_NSTD_UNUSED_HPP