Delete example.cpp
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Gabi Melman
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//
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// Copyright(c) 2015 Gabi Melman.
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// Distributed under the MIT License (http://opensource.org/licenses/MIT)
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//
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//
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// spdlog usage example
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//
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//
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#define SPDLOG_TRACE_ON
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#define SPDLOG_DEBUG_ON
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#include "spdlog/spdlog.h"
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#include <iostream>
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#include <memory>
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void async_example();
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void syslog_example();
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void android_example();
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void user_defined_example();
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void err_handler_example();
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namespace spd = spdlog;
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int main(int, char *[])
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{
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try
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{
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// Console logger with color
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auto console = spd::stdout_color_mt("console");
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console->info("Welcome to spdlog!");
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console->error("Some error message with arg{}..", 1);
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// Formatting examples
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console->warn("Easy padding in numbers like {:08d}", 12);
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console->critical("Support for int: {0:d}; hex: {0:x}; oct: {0:o}; bin: {0:b}", 42);
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console->info("Support for floats {:03.2f}", 1.23456);
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console->info("Positional args are {1} {0}..", "too", "supported");
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console->info("{:<30}", "left aligned");
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spd::get("console")->info("loggers can be retrieved from a global registry using the spdlog::get(logger_name) function");
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// Create basic file logger (not rotated)
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auto my_logger = spd::basic_logger_mt("basic_logger", "logs/basic-log.txt");
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my_logger->info("Some log message");
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// Create a file rotating logger with 5mb size max and 3 rotated files
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auto rotating_logger = spd::rotating_logger_mt("some_logger_name", "logs/rotating.txt", 1048576 * 5, 3);
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for (int i = 0; i < 10; ++i)
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rotating_logger->info("{} * {} equals {:>10}", i, i, i * i);
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// Create a daily logger - a new file is created every day on 2:30am
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auto daily_logger = spd::daily_logger_mt("daily_logger", "logs/daily.txt", 2, 30);
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// trigger flush if the log severity is error or higher
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daily_logger->flush_on(spd::level::err);
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daily_logger->info(123.44);
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// Customize msg format for all messages
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spd::set_pattern("*** [%H:%M:%S %z] [thread %t] %v ***");
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rotating_logger->info("This is another message with custom format");
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// Runtime log levels
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spd::set_level(spd::level::info); // Set global log level to info
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console->debug("This message should not be displayed!");
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console->set_level(spd::level::debug); // Set specific logger's log level
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console->debug("This message should be displayed..");
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// Compile time log levels
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// define SPDLOG_DEBUG_ON or SPDLOG_TRACE_ON
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SPDLOG_TRACE(console, "Enabled only #ifdef SPDLOG_TRACE_ON..{} ,{}", 1, 3.23);
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SPDLOG_DEBUG(console, "Enabled only #ifdef SPDLOG_DEBUG_ON.. {} ,{}", 1, 3.23);
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// Asynchronous logging is very fast..
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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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async_example();
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// syslog example. linux/osx only
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syslog_example();
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// android example. compile with NDK
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android_example();
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// Log user-defined types example
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user_defined_example();
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// Change default log error handler
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err_handler_example();
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// Apply a function on all registered loggers
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spd::apply_all([&](std::shared_ptr<spdlog::logger> l) { l->info("End of example."); });
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// Release and close all loggers
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spdlog::drop_all();
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}
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// Exceptions will only be thrown upon failed logger or sink construction (not during logging)
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catch (const spd::spdlog_ex &ex)
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{
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std::cout << "Log init failed: " << ex.what() << std::endl;
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return 1;
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}
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}
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void async_example()
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{
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size_t q_size = 4096; // queue size must be power of 2
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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)
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async_file->info("Async message #{}", i);
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}
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// syslog example (linux/osx/freebsd)
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void syslog_example()
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{
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#ifdef SPDLOG_ENABLE_SYSLOG
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std::string ident = "spdlog-example";
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auto syslog_logger = spd::syslog_logger("syslog", ident, LOG_PID);
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syslog_logger->warn("This is warning that will end up in syslog.");
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#endif
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}
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// Android example
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void android_example()
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{
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#if defined(__ANDROID__)
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std::string tag = "spdlog-android";
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auto android_logger = spd::android_logger("android", tag);
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android_logger->critical("Use \"adb shell logcat\" to view this message.");
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#endif
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}
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// user defined types logging by implementing operator<<
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struct my_type
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{
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int i;
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template<typename OStream>
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friend OStream &operator<<(OStream &os, const my_type &c)
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{
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return os << "[my_type i=" << c.i << "]";
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}
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};
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#include "spdlog/fmt/ostr.h" // must be included
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void user_defined_example()
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{
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spd::get("console")->info("user defined type: {}", my_type{14});
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}
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//
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// custom error handler
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//
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void err_handler_example()
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{
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// can be set globaly or per logger(logger->set_error_handler(..))
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spdlog::set_error_handler([](const std::string &msg) { std::cerr << "my err handler: " << msg << std::endl; });
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spd::get("console")->info("some invalid message to trigger an error {}{}{}{}", 3);
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}
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