utils.hpp

// Copyright Take Vos 2020.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include <atomic>
#include <utility>
 
#define hi_get_overloaded_macro2(_1, _2, name, ...) name
 
namespace hi::inline v1 {
 
template<typename T, typename U>
[[nodiscard]] bool compare_store(T &lhs, U &&rhs) noexcept
{
    if (lhs != rhs) {
        lhs = std::forward<U>(rhs);
        return true;
    } else {
        return false;
    }
}
 
template<typename T, typename U>
[[nodiscard]] bool compare_store(std::atomic<T> &lhs, U &&rhs) noexcept
{
    return lhs.exchange(rhs, std::memory_order::relaxed) != rhs;
}
 
} // namespace hi::inline v1