ignore.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2019 Tobias Hienzsch
 
#ifndef TETL_TUPLE_IGNORE_HPP
#define TETL_TUPLE_IGNORE_HPP
 
namespace etl {
 
/// \brief An object of unspecified type such that any value can be assigned to
/// it with no effect. Intended for use with etl::tie when unpacking a
/// etl::tuple, as a placeholder for the arguments that are not used.
inline constexpr struct ignore {
    template <typename T>
    constexpr auto operator=(T const& /*unused*/) const -> auto const&
    {
        return *this;
    }
} ignore;
 
} // namespace etl
 
#endif // TETL_TUPLE_IGNORE_HPP