spdlog/example/example.cpp

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/*************************************************************************/
/* spdlog - an extremely fast and easy to use c++11 logging library. */
/* Copyright (c) 2014 Gabi Melman. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
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//
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// spdlog usage example
//
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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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std::string filename = "logs/spdlog_example";
// Set log level to all loggers to DEBUG and above
spd::set_level(spd::level::DEBUG);
//Create console, multithreaded logger
auto console = spd::stdout_logger_mt("console");
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console->info("Welcome to spdlog!") ;
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console->info("An info message example {}..", 1);
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console->info() << "Streams are supported too " << 1;
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console->info("Easy padding in numbers like {:08d}", 12);
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console->info("Support for int: {0:d}; hex: {0:08x}; oct: {0:o}; bin: {0:b}", 42);
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console->info("Support for floats {:03.2f}", 1.23456);
console->info("Positional args are {1} {0}..", "too", "supported");
console->info("{:<30}", "left aligned");
console->info("{:>30}", "right aligned");
console->info("{:^30}", "centered");
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//Create a file rotating logger with 5mb size max and 3 rotated files
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);
for(int i = 0; i < 10; ++i)
file_logger->info("{} * {} equals {:>10}", i, i, i*i);
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spd::set_pattern("*** [%H:%M:%S %z] [thread %t] %v ***");
file_logger->info("This is another message with custom format");
spd::get("console")->info("loggers can be retrieved from a global registry using the spdlog::get(logger_name) function");
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// Debug and trace macros to be turned on/off at compile time.
// Evaluates to empty statements if not turned on
// Define SPDLOG_DEBUG_ON or SPDLOG_TRACE_ON - before including spdlog.h
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SPDLOG_TRACE(console, "Enabled only #ifdef SPDLOG_TRACE_ON..{} ,{}", 1, 3.23);
SPDLOG_DEBUG(console, "Enabled only #ifdef SPDLOG_DEBUG_ON.. {} ,{}", 1, 3.23);
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#ifdef __linux__
// syslog example
std::string ident = "spdlog_example"; // empty ident can be used to use current program name
auto syslog_logger = spd::syslog_logger("syslog", ident, LOG_PID);
syslog_logger->set_pattern("[%l] %v"); //syslog already put timestamps so set the pattern to minimum (log level and the message)
syslog_logger->warn("This message that will end up in syslog. This is Linux only..");
#endif
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// Asynchronous logging is easy..
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// Just call spdlog::set_async_mode(q_size) and all created loggers from now on will be asynchronous..
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// Note: queue size must be power of 2!
size_t q_size = 1048576;
spdlog::set_async_mode(q_size);
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auto async_file= spd::daily_logger_st("async_file_logger", "logs/async_log.txt");
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for(int i = 0; i < 100; i++)
async_file->info("This is async log message #{}.. Should be very fast.. ", i);
}
catch (const spd::spdlog_ex& ex)
{
std::cout << "Log failed: " << ex.what() << std::endl;
}
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return 0;
}
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