bench | ||
example | ||
include/spdlog | ||
.gitignore | ||
astyle.sh | ||
INSTALL | ||
LICENSE | ||
README.md |
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.
- new! Feature rich cppfromat call style using the excellent cppformat library:
logger.info("Hello {}+{}={}", 1, 2, 3);
- ostream call style ```logger.info() << "Hello << "logger";
- Custom 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 interface).
- Optional, even faster, async logging .
- Log levels.
Benchmarks
Below are some benchmarks 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 async mode |
---|---|---|---|---|---|
1 | 4.779s | 1.109s | 3.155s | 0.947s | 1.455s |
10 | 15.151ss | 3.546s | 3.500s | 1.549s | 2.040s |
Usage Example
#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)
{
file_logger->info("{} * {} = {}, i, i, i*i );
}
console->info("Easy padding in numbers like {:08d}", 12);
console->info("int: {0:d}; hex: {0:x}; oct: {0:o}; bin: {0:b}", 42);
console->info("Positional args are {1} {0}..", "too", "supported):
console->info("{:<30}", "left aligned");
console->info("{:>30}", "right aligned");
console->info("{:^30}", "centered");
//see cppformat's full docs here:
//http://cppformat.readthedocs.org/en/stable/syntax.html
// 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;
}