ostream_sink.h

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// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)
 
#pragma once
 
#include <spdlog/details/null_mutex.h>
#include <spdlog/sinks/base_sink.h>
 
#include <mutex>
#include <ostream>
 
namespace spdlog
{
    namespace sinks
    {
        template <typename Mutex>
        class ostream_sink final : public base_sink<Mutex>
        {
        public:
            explicit ostream_sink(std::ostream& os, bool force_flush = false)
                : ostream_(os), force_flush_(force_flush)
            {
            }
            ostream_sink(const ostream_sink&)            = delete;
            ostream_sink& operator=(const ostream_sink&) = delete;
 
        protected:
            void sink_it_(const details::log_msg& msg) override
            {
                memory_buf_t formatted;
                base_sink<Mutex>::formatter_->format(msg, formatted);
                ostream_.write(formatted.data(), static_cast<std::streamsize>(formatted.size()));
                if (force_flush_)
                {
                    ostream_.flush();
                }
            }
 
            void flush_() override
            {
                ostream_.flush();
            }
 
            std::ostream& ostream_;
            bool          force_flush_;
        };
 
        using ostream_sink_mt = ostream_sink<std::mutex>;
        using ostream_sink_st = ostream_sink<details::null_mutex>;
 
    } // namespace sinks
} // namespace spdlog