90 lines
2.5 KiB
Markdown
90 lines
2.5 KiB
Markdown
# spdlog
|
|
|
|
Very fast, header only, C++ logging library.
|
|
|
|
|
|
## Install
|
|
Just copy the files to your build tree and use a C++11 compiler
|
|
|
|
|
|
## Tested on:
|
|
* gcc 4.8.1 and above
|
|
* clang 3.5
|
|
* visual studio 2013
|
|
* mingw with g++ 4.9.x
|
|
|
|
##Features
|
|
* Very fast - performance is the primary goal (see becnhmarks below).
|
|
* Headers only.
|
|
* No dependencies.
|
|
* Cross platform - Linux / Windows on 32/64 bits.
|
|
* Variadic-template/stream call styles: ```logger.info("variadic", x, y) << "or stream" << z;```
|
|
* [Custom](https://github.com/gabime/spdlog/wiki/Custom-formatting) formatting.
|
|
* Multi/Single threaded loggers.
|
|
* Various log targets:
|
|
* Rotating log files.
|
|
* Daily log files.
|
|
* Console logging.
|
|
* Linux syslog.
|
|
* Easily extendable with custom log targets (just implement a single function in the [sink](include/spdlog/sinks/sink.h) interface).
|
|
* Optional async logging .
|
|
* Log levels.
|
|
|
|
|
|
|
|
|
|
## Benchmarks
|
|
|
|
Below are some [benchmarks](bench) comparing the time needed to log 1,000,000 lines to file under Ubuntu 64 bit, Intel i7-4770 CPU @ 3.40GHz:
|
|
|
|
|threads|boost log|glog|g2log|spdlog|spdlog <sup>async mode</sup>|
|
|
|-------|:-------:|:-----:|------:|------:|------:|
|
|
|1|4.779s|1.109s|3.155s|0.947s|1.455s
|
|
|10|15.151ss|3.546s|3.500s|1.549s|2.040s|
|
|
|
|
|
|
|
|
|
|
## Usage Example
|
|
```c++
|
|
#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;
|
|
}
|
|
```
|