xchg.hpp

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/*
 * SPDX-FileCopyrightText: © 2025 Larry Chips <larry@larrychips.net>
 * SPDX-Licence-Identifier: MIT
 */
#ifndef UGMISC_XCHG_HPP
#define UGMISC_XCHG_HPP
 
#include "ugmisc/features.hpp"
 
#ifdef UGMISC_HAVE_CONSTEXPR_EXCHANGE
#include <algorithm>
#endif
#include <utility>
 

 
 
 
 
namespace ugmisc {
 
 
 

template<class T, class U=T>
constexpr T xchg(T& object, U&& new_value) {
    if constexpr ( Features::constexpr_swap_algorithms ) {
        return std::exchange(object, std::forward<U>(new_value));
    } else {
        T ret{std::move(object)};
        object = std::move(new_value);
        return ret;
    }
}
 
 
 
 
} /* ::ugmisc */
 
#endif /* UGMISC_XCHG_HPP */