85 lines
2.3 KiB
Markdown
85 lines
2.3 KiB
Markdown
# spdlog
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Very fast, header only, C++ logging library.
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## Install
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Just copy the files to your build tree and use a C++11 compiler
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## Tested on:
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* gcc 4.8.1 and above
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* clang 3.5
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* visual studio 2013
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##Features
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* Very low overhead
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* Stream like, easy to use interface
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* Logging levels
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* Rotating log files
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* Daily log files
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* Async logging
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* Thread safety
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* Custom formatting
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## Performance
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The library is very fast.
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Here are some benchmarks (Ubuntu, Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz)
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```
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*******************************************************************************
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Single thread, 250,000 iterations, flush every 1000 lines
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*******************************************************************************
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rotating_st... 817,860 lines/sec
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daily_st... 827,820 lines /sec
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*******************************************************************************
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4 threads sharing same logger, 250,000 iterations, flush every 1000 lines
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*******************************************************************************
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rotating_mt... 1,476,013 lines/sec
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daily_mt... 1,477,619 lines/sec
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```
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## Usage Example
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```
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#include <iostream>
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#include "spdlog/spdlog.h"
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int main(int, char* [])
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{
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namespace spd = spdlog;
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try
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{
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std::string filename = "spdlog_example";
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auto console = spd::stderr_logger_mt("console");
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console->info("Welcome to spdlog!") ;
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console->info() << "Creating file " << filename << "..";
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auto file_logger = spd::rotating_logger_mt("file_logger", filename, 1024 * 1024 * 5, 3);
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file_logger->info("Log file message number", 1);
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for (int i = 0; i < 100; ++i)
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{
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auto square = i*i;
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file_logger->info() << i << '*' << i << '=' << square << " (" << "0x" << std::hex << square << ")";
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}
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// Change log level to all loggers to warning and above
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spd::set_level(spd::level::WARN);
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console->info("This should not be displayed");
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console->warn("This should!");
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spd::set_level(spd::level::INFO);
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// Change format pattern to all loggers
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spd::set_pattern(" **** %Y-%m-%d %H:%M:%S.%e %l **** %v");
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spd::get("console")->info("This is another message with different format");
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}
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catch (const spd::spdlog_ex& ex)
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{
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std::cout << "Log failed: " << ex.what() << std::endl;
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}
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return 0;
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}
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```
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