超級快的C++日志庫：spdlog

spdlog 是一個只包含頭文件，兼容 C++11。快速的 C++ 日志庫。

安裝:只需將文件復制到你的構建，然后使用一個C++11編譯器。

#include <iostream>
#include "spdlog/spdlog.h"

int main(int, char* [])
{
    namespace spd = spdlog;

    try
    {
        std::string filename = "spdlog_example";
        auto console = spd::stdout_logger_mt("console");
        console->info("Welcome to spdlog!") ;
        console->info() << "Creating file " << filename << "..";

        auto file_logger = spd::rotating_logger_mt("file_logger", filename, 1024 * 1024 * 5, 3);
        file_logger->info("Log file message number", 1);

        for (int i = 0; i < 100; ++i)
        {
            auto square = i*i;
            file_logger->info() << i << '*' << i << '=' << square << " (" << "0x" << std::hex << square << ")";
        }

        // Change log level to all loggers to warning and above
        spd::set_level(spd::level::WARN);
        console->info("This should not be displayed");
        console->warn("This should!");
        spd::set_level(spd::level::INFO);

        // Change format pattern to all loggers
        spd::set_pattern(" **** %Y-%m-%d %H:%M:%S.%e %l **** %v");
        spd::get("console")->info("This is another message with different format");
    }
    catch (const spd::spdlog_ex& ex)
    {
        std::cout << "Log failed: " << ex.what() << std::endl;
    }
    return 0;
}

特性:

• 非常快 – 性能是主要目的(see becnhmarks below)
• Headers only
• 沒有依賴
• 支持多個平臺 - Linux / Windows on 32/64 bits
• 多個/單個線程日志器Mult/Single threaded loggers
• Rotating log files
• Daily log files
• Console logging
• Optional async logging
• Logging levels
• Custom formatting with user defined patterns
  

項目主頁：http://www.baiduhome.net/lib/view/home/1415152358949