source: trunk/GDE/SINA/builddir/include/spdlog/details/null_mutex.h

//
// Copyright(c) 2015 Gabi Melman.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)
//

#pragma once

#include <atomic>
// null, no cost dummy "mutex" and dummy "atomic" int

namespace spdlog {
namespace details {
struct null_mutex
{
    void lock() {}
    void unlock() {}
    bool try_lock()
    {
        return true;
    }
};

struct null_atomic_int
{
    int value;
    null_atomic_int() = default;

    explicit null_atomic_int(int val)
        : value(val)
    {
    }

    int load(std::memory_order) const
    {
        return value;
    }

    void store(int val)
    {
        value = val;
    }
};

} // namespace details
} // namespace spdlog