update and change how we build with spdlog
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							| @@ -1,319 +1,356 @@ | ||||
| # spdlog | ||||
|  | ||||
| Very fast, header only, C++ logging library. [](https://travis-ci.org/gabime/spdlog)  [](https://ci.appveyor.com/project/gabime/spdlog) | ||||
|  | ||||
|  | ||||
|  | ||||
| ## Install | ||||
| #### Just copy the headers: | ||||
|  | ||||
| * Copy the source [folder](https://github.com/gabime/spdlog/tree/v1.x/include/spdlog) to your build tree and use a C++11 compiler. | ||||
|  | ||||
| #### Or use your favorite package manager: | ||||
|  | ||||
| * Ubuntu: `apt-get install libspdlog-dev` | ||||
| * Homebrew: `brew install spdlog` | ||||
| * FreeBSD:  `cd /usr/ports/devel/spdlog/ && make install clean` | ||||
| * Fedora: `yum install spdlog` | ||||
| * Gentoo: `emerge dev-libs/spdlog` | ||||
| * Arch Linux: `yaourt -S spdlog-git` | ||||
| * vcpkg: `vcpkg install spdlog` | ||||
|  | ||||
|  | ||||
| ## Platforms | ||||
|  * Linux, FreeBSD, OpenBSD, Solaris, AIX | ||||
|  * Windows (msvc 2013+, cygwin) | ||||
|  * macOS (clang 3.5+) | ||||
|  * Android | ||||
|  | ||||
| ## Features | ||||
| * Very fast (see [benchmarks](#benchmarks) below). | ||||
| * Headers only, just copy and use. | ||||
| * Feature rich formatting, using the excellent [fmt](https://github.com/fmtlib/fmt) library. | ||||
| * Fast asynchronous mode (optional) | ||||
| * [Custom](https://github.com/gabime/spdlog/wiki/3.-Custom-formatting) formatting. | ||||
| * Multi/Single threaded loggers. | ||||
| * Various log targets: | ||||
|     * Rotating log files. | ||||
|     * Daily log files. | ||||
|     * Console logging (colors supported). | ||||
|     * syslog. | ||||
|     * Windows debugger (```OutputDebugString(..)```) | ||||
|     * Easily extendable with custom log targets  (just implement a single function in the [sink](include/spdlog/sinks/sink.h) interface). | ||||
| * Severity based filtering - threshold levels can be modified in runtime as well as in compile time. | ||||
| * Binary data logging. | ||||
|  | ||||
|  | ||||
| ## Benchmarks | ||||
|  | ||||
| Below are some [benchmarks](https://github.com/gabime/spdlog/blob/v1.x/bench/bench.cpp) done in Ubuntu 64 bit, Intel i7-4770 CPU @ 3.40GHz | ||||
|  | ||||
| #### Synchronous mode | ||||
| ``` | ||||
| ******************************************************************************* | ||||
| Single thread, 1,000,000 iterations | ||||
| ******************************************************************************* | ||||
| basic_st...             Elapsed: 0.181652       5,505,042/sec | ||||
| rotating_st...          Elapsed: 0.181781       5,501,117/sec | ||||
| daily_st...             Elapsed: 0.187595       5,330,630/sec | ||||
| null_st...              Elapsed: 0.0504704      19,813,602/sec | ||||
| ******************************************************************************* | ||||
| 10 threads sharing same logger, 1,000,000 iterations | ||||
| ******************************************************************************* | ||||
| basic_mt...             Elapsed: 0.616035       1,623,284/sec | ||||
| rotating_mt...          Elapsed: 0.620344       1,612,008/sec | ||||
| daily_mt...             Elapsed: 0.648353       1,542,369/sec | ||||
| null_mt...              Elapsed: 0.151972       6,580,166/sec | ||||
| ``` | ||||
| #### Asynchronous mode | ||||
| ``` | ||||
| ******************************************************************************* | ||||
| 10 threads sharing same logger, 1,000,000 iterations | ||||
| ******************************************************************************* | ||||
| async...                Elapsed: 0.350066       2,856,606/sec | ||||
| async...                Elapsed: 0.314865       3,175,960/sec | ||||
| async...                Elapsed: 0.349851       2,858,358/sec | ||||
| ``` | ||||
|  | ||||
| ## Usage samples | ||||
|  | ||||
| #### Basic usage | ||||
| ```c++ | ||||
| #include "spdlog/spdlog.h" | ||||
| int main() | ||||
| { | ||||
|     spdlog::info("Welcome to spdlog!"); | ||||
|     spdlog::error("Some error message with arg: {}", 1); | ||||
|  | ||||
|     spdlog::warn("Easy padding in numbers like {:08d}", 12); | ||||
|     spdlog::critical("Support for int: {0:d};  hex: {0:x};  oct: {0:o}; bin: {0:b}", 42); | ||||
|     spdlog::info("Support for floats {:03.2f}", 1.23456); | ||||
|     spdlog::info("Positional args are {1} {0}..", "too", "supported"); | ||||
|     spdlog::info("{:<30}", "left aligned"); | ||||
|  | ||||
|     spdlog::set_level(spdlog::level::debug); // Set global log level to debug | ||||
|     spdlog::debug("This message should be displayed.."); | ||||
|  | ||||
|     // change log pattern | ||||
|     spdlog::set_pattern("[%H:%M:%S %z] [%n] [%^---%L---%$] [thread %t] %v"); | ||||
|  | ||||
|     // Compile time log levels | ||||
|     // define SPDLOG_ACTIVE_LEVEL to desired level | ||||
|     SPDLOG_TRACE("Some trace message with param {}", {}); | ||||
|     SPDLOG_DEBUG("Some debug message"); | ||||
|  | ||||
| } | ||||
| ``` | ||||
| #### create stdout/stderr logger object | ||||
| ```c++ | ||||
| #include "spdlog/spdlog.h" | ||||
| #include "spdlog/sinks/stdout_color_sinks.h" | ||||
| void stdout_example() | ||||
| { | ||||
|     // create color multi threaded logger | ||||
|     auto console = spdlog::stdout_color_mt("console"); | ||||
|     auto err_logger = spdlog::stderr_color_mt("stderr"); | ||||
|     spdlog::get("console")->info("loggers can be retrieved from a global registry using the spdlog::get(logger_name)"); | ||||
| } | ||||
| ``` | ||||
| --- | ||||
| #### Basic file logger | ||||
| ```c++ | ||||
| #include "spdlog/sinks/basic_file_sink.h" | ||||
| void basic_logfile_example() | ||||
| { | ||||
|     try | ||||
|     { | ||||
|         auto my_logger = spdlog::basic_logger_mt("basic_logger", "logs/basic-log.txt"); | ||||
|     } | ||||
|     catch (const spdlog::spdlog_ex &ex) | ||||
|     { | ||||
|         std::cout << "Log init failed: " << ex.what() << std::endl; | ||||
|     } | ||||
| } | ||||
| ``` | ||||
| --- | ||||
| #### Rotating files | ||||
| ```c++ | ||||
| #include "spdlog/sinks/rotating_file_sink.h" | ||||
| void rotating_example() | ||||
| { | ||||
|     // Create a file rotating logger with 5mb size max and 3 rotated files | ||||
|     auto rotating_logger = spdlog::rotating_logger_mt("some_logger_name", "logs/rotating.txt", 1048576 * 5, 3); | ||||
| } | ||||
| ``` | ||||
|  | ||||
| --- | ||||
| #### Daily files | ||||
| ```c++ | ||||
|  | ||||
| #include "spdlog/sinks/daily_file_sink.h" | ||||
| void daily_example() | ||||
| { | ||||
|     // Create a daily logger - a new file is created every day on 2:30am | ||||
|     auto daily_logger = spdlog::daily_logger_mt("daily_logger", "logs/daily.txt", 2, 30); | ||||
| } | ||||
|  | ||||
| ``` | ||||
|  | ||||
| --- | ||||
| #### Cloning loggers | ||||
| ```c++ | ||||
| // clone a logger and give it new name. | ||||
| // Useful for creating subsystem loggers from some "root" logger | ||||
| void clone_example() | ||||
| { | ||||
|     auto network_logger = spdlog::get("root")->clone("network"); | ||||
|     network_logger->info("Logging network stuff.."); | ||||
| } | ||||
| ``` | ||||
|  | ||||
| --- | ||||
| #### Periodic flush | ||||
| ```c++ | ||||
| // periodically flush all *registered* loggers every 3 seconds: | ||||
| // warning: only use if all your loggers are thread safe! | ||||
| spdlog::flush_every(std::chrono::seconds(3)); | ||||
|  | ||||
| ``` | ||||
|  | ||||
| --- | ||||
| #### Binary logging | ||||
| ```c++ | ||||
| // log binary data as hex. | ||||
| // many types of std::container<char> types can be used. | ||||
| // ranges are supported too. | ||||
| // format flags: | ||||
| // {:X} - print in uppercase. | ||||
| // {:s} - don't separate each byte with space. | ||||
| // {:p} - don't print the position on each line start. | ||||
| // {:n} - don't split the output to lines. | ||||
|  | ||||
| #include "spdlog/fmt/bin_to_hex.h" | ||||
|  | ||||
| void binary_example() | ||||
| { | ||||
|     auto console = spdlog::get("console"); | ||||
|     std::array<char, 80> buf; | ||||
|     console->info("Binary example: {}", spdlog::to_hex(buf)); | ||||
|     console->info("Another binary example:{:n}", spdlog::to_hex(std::begin(buf), std::begin(buf) + 10)); | ||||
|     // more examples: | ||||
|     // logger->info("uppercase: {:X}", spdlog::to_hex(buf)); | ||||
|     // logger->info("uppercase, no delimiters: {:Xs}", spdlog::to_hex(buf)); | ||||
|     // logger->info("uppercase, no delimiters, no position info: {:Xsp}", spdlog::to_hex(buf)); | ||||
| } | ||||
|  | ||||
| ``` | ||||
|  | ||||
| --- | ||||
| #### Logger with multi sinks - each with different format and log level | ||||
| ```c++ | ||||
|  | ||||
| // create logger with 2 targets with different log levels and formats. | ||||
| // the console will show only warnings or errors, while the file will log all. | ||||
| void multi_sink_example() | ||||
| { | ||||
|     auto console_sink = std::make_shared<spdlog::sinks::stdout_color_sink_mt>(); | ||||
|     console_sink->set_level(spdlog::level::warn); | ||||
|     console_sink->set_pattern("[multi_sink_example] [%^%l%$] %v"); | ||||
|  | ||||
|     auto file_sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>("logs/multisink.txt", true); | ||||
|     file_sink->set_level(spdlog::level::trace); | ||||
|  | ||||
|     spdlog::logger logger("multi_sink", {console_sink, file_sink}); | ||||
|     logger.set_level(spdlog::level::debug); | ||||
|     logger.warn("this should appear in both console and file"); | ||||
|     logger.info("this message should not appear in the console, only in the file"); | ||||
| } | ||||
| ``` | ||||
|  | ||||
| --- | ||||
| #### Asynchronous logging | ||||
| ```c++ | ||||
| #include "spdlog/async.h" | ||||
| #include "spdlog/sinks/basic_file_sink.h" | ||||
| void async_example() | ||||
| { | ||||
|     // default thread pool settings can be modified *before* creating the async logger: | ||||
|     // spdlog::init_thread_pool(8192, 1); // queue with 8k items and 1 backing thread. | ||||
|     auto async_file = spdlog::basic_logger_mt<spdlog::async_factory>("async_file_logger", "logs/async_log.txt"); | ||||
|     // alternatively: | ||||
|     // auto async_file = spdlog::create_async<spdlog::sinks::basic_file_sink_mt>("async_file_logger", "logs/async_log.txt"); | ||||
| } | ||||
|  | ||||
| ``` | ||||
|  | ||||
| --- | ||||
| #### Asynchronous logger with multi sinks | ||||
| ```c++ | ||||
| #include "spdlog/sinks/stdout_color_sinks.h" | ||||
| #include "spdlog/sinks/rotating_file_sink.h" | ||||
|  | ||||
| void multi_sink_example2() | ||||
| { | ||||
|     spdlog::init_thread_pool(8192, 1); | ||||
|     auto stdout_sink = std::make_shared<spdlog::sinks::stdout_color_sink_mt >(); | ||||
|     auto rotating_sink = std::make_shared<spdlog::sinks::rotating_file_sink_mt>("mylog.txt", 1024*1024*10, 3); | ||||
|     std::vector<spdlog::sink_ptr> sinks {stdout_sink, rotating_sink}; | ||||
|     auto logger = std::make_shared<spdlog::async_logger>("loggername", sinks.begin(), sinks.end(), spdlog::thread_pool(), spdlog::async_overflow_policy::block); | ||||
|     spdlog::register_logger(logger); | ||||
| } | ||||
| ``` | ||||
|  | ||||
| --- | ||||
| #### User defined types | ||||
| ```c++ | ||||
| // user defined types logging by implementing operator<< | ||||
| #include "spdlog/fmt/ostr.h" // must be included | ||||
| struct my_type | ||||
| { | ||||
|     int i; | ||||
|     template<typename OStream> | ||||
|     friend OStream &operator<<(OStream &os, const my_type &c) | ||||
|     { | ||||
|         return os << "[my_type i=" << c.i << "]"; | ||||
|     } | ||||
| }; | ||||
|  | ||||
| void user_defined_example() | ||||
| { | ||||
|     spdlog::get("console")->info("user defined type: {}", my_type{14}); | ||||
| } | ||||
|  | ||||
| ``` | ||||
| --- | ||||
| #### Custom error handler | ||||
| ```c++ | ||||
| void err_handler_example() | ||||
| { | ||||
|     // can be set globally or per logger(logger->set_error_handler(..)) | ||||
|     spdlog::set_error_handler([](const std::string &msg) { spdlog::get("console")->error("*** LOGGER ERROR ***: {}", msg); }); | ||||
|     spdlog::get("console")->info("some invalid message to trigger an error {}{}{}{}", 3); | ||||
| } | ||||
|  | ||||
| ``` | ||||
| --- | ||||
| #### syslog | ||||
| ```c++ | ||||
| #include "spdlog/sinks/syslog_sink.h" | ||||
| void syslog_example() | ||||
| { | ||||
|     std::string ident = "spdlog-example"; | ||||
|     auto syslog_logger = spdlog::syslog_logger_mt("syslog", ident, LOG_PID); | ||||
|     syslog_logger->warn("This is warning that will end up in syslog."); | ||||
| } | ||||
| ``` | ||||
| --- | ||||
| #### Android example | ||||
| ```c++ | ||||
| #include "spdlog/sinks/android_sink.h" | ||||
| void android_example() | ||||
| { | ||||
|     std::string tag = "spdlog-android"; | ||||
|     auto android_logger = spdlog::android_logger("android", tag); | ||||
|     android_logger->critical("Use \"adb shell logcat\" to view this message."); | ||||
| } | ||||
| ``` | ||||
|  | ||||
| ## Documentation | ||||
| Documentation can be found in the [wiki](https://github.com/gabime/spdlog/wiki/1.-QuickStart) pages. | ||||
| # spdlog | ||||
|  | ||||
| Very fast, header-only/compiled, C++ logging library. [](https://travis-ci.org/gabime/spdlog)  [](https://ci.appveyor.com/project/gabime/spdlog) | ||||
|  | ||||
|  | ||||
|  | ||||
| ## Install  | ||||
| #### Header only version | ||||
| Copy the source [folder](https://github.com/gabime/spdlog/tree/v1.x/include/spdlog) to your build tree and use a C++11 compiler. | ||||
|  | ||||
| #### Static lib version (recommended - much faster compile times) | ||||
| ```console | ||||
| $ git clone https://github.com/gabime/spdlog.git | ||||
| $ cd spdlog && mkdir build && cd build | ||||
| $ cmake .. && make -j | ||||
| ``` | ||||
|        | ||||
|    see example [CMakeLists.txt](https://github.com/gabime/spdlog/blob/v1.x/example/CMakeLists.txt) on how to use. | ||||
|  | ||||
| ## Platforms | ||||
|  * Linux, FreeBSD, OpenBSD, Solaris, AIX | ||||
|  * Windows (msvc 2013+, cygwin) | ||||
|  * macOS (clang 3.5+) | ||||
|  * Android | ||||
|  | ||||
| ## Package managers: | ||||
| * Homebrew: `brew install spdlog` | ||||
| * FreeBSD:  `cd /usr/ports/devel/spdlog/ && make install clean` | ||||
| * Fedora: `yum install spdlog` | ||||
| * Gentoo: `emerge dev-libs/spdlog` | ||||
| * Arch Linux: `yaourt -S spdlog-git` | ||||
| * vcpkg: `vcpkg install spdlog` | ||||
|  | ||||
| ## Features | ||||
| * Very fast (see [benchmarks](#benchmarks) below). | ||||
| * Headers only, just copy and use. Or use as a compiled library. | ||||
| * Feature rich formatting, using the excellent [fmt](https://github.com/fmtlib/fmt) library. | ||||
| * **New!** [Backtrace](#backtrace-support) support - store debug or other messages in a ring buffer and display later on demand. | ||||
| * Fast asynchronous mode (optional) | ||||
| * [Custom](https://github.com/gabime/spdlog/wiki/3.-Custom-formatting) formatting. | ||||
| * Multi/Single threaded loggers. | ||||
| * Various log targets: | ||||
|     * Rotating log files. | ||||
|     * Daily log files. | ||||
|     * Console logging (colors supported). | ||||
|     * syslog. | ||||
|     * Windows debugger (```OutputDebugString(..)```) | ||||
|     * Easily extendable with custom log targets  (just implement a single function in the [sink](include/spdlog/sinks/sink.h) interface). | ||||
| * Severity based filtering - threshold levels can be modified in runtime as well as in compile time. | ||||
|  | ||||
|   | ||||
| ## Usage samples | ||||
|  | ||||
| #### Basic usage | ||||
| ```c++ | ||||
| #include "spdlog/spdlog.h" | ||||
| #include "spdlog/sinks/basic_file_sink.h" | ||||
|  | ||||
| int main()  | ||||
| { | ||||
|     spdlog::info("Welcome to spdlog!"); | ||||
|     spdlog::error("Some error message with arg: {}", 1); | ||||
|      | ||||
|     spdlog::warn("Easy padding in numbers like {:08d}", 12); | ||||
|     spdlog::critical("Support for int: {0:d};  hex: {0:x};  oct: {0:o}; bin: {0:b}", 42); | ||||
|     spdlog::info("Support for floats {:03.2f}", 1.23456); | ||||
|     spdlog::info("Positional args are {1} {0}..", "too", "supported"); | ||||
|     spdlog::info("{:<30}", "left aligned"); | ||||
|      | ||||
|     spdlog::set_level(spdlog::level::debug); // Set global log level to debug | ||||
|     spdlog::debug("This message should be displayed..");     | ||||
|      | ||||
|     // change log pattern | ||||
|     spdlog::set_pattern("[%H:%M:%S %z] [%n] [%^---%L---%$] [thread %t] %v"); | ||||
|      | ||||
|     // Compile time log levels | ||||
|     // define SPDLOG_ACTIVE_LEVEL to desired level | ||||
|     SPDLOG_TRACE("Some trace message with param {}", {}); | ||||
|     SPDLOG_DEBUG("Some debug message"); | ||||
|      | ||||
|     // Set the default logger to file logger | ||||
|     auto file_logger = spdlog::basic_logger_mt("basic_logger", "logs/basic.txt"); | ||||
|     spdlog::set_default_logger(file_logger);             | ||||
| } | ||||
| ``` | ||||
| #### create stdout/stderr logger object | ||||
| ```c++ | ||||
| #include "spdlog/spdlog.h" | ||||
| #include "spdlog/sinks/stdout_color_sinks.h" | ||||
| void stdout_example() | ||||
| { | ||||
|     // create color multi threaded logger | ||||
|     auto console = spdlog::stdout_color_mt("console");     | ||||
|     auto err_logger = spdlog::stderr_color_mt("stderr");     | ||||
|     spdlog::get("console")->info("loggers can be retrieved from a global registry using the spdlog::get(logger_name)"); | ||||
| } | ||||
| ``` | ||||
| --- | ||||
| #### Basic file logger | ||||
| ```c++ | ||||
| #include "spdlog/sinks/basic_file_sink.h" | ||||
| void basic_logfile_example() | ||||
| { | ||||
|     try  | ||||
|     { | ||||
|         auto my_logger = spdlog::basic_logger_mt("basic_logger", "logs/basic-log.txt"); | ||||
|     } | ||||
|     catch (const spdlog::spdlog_ex &ex) | ||||
|     { | ||||
|         std::cout << "Log init failed: " << ex.what() << std::endl; | ||||
|     } | ||||
| } | ||||
| ``` | ||||
| --- | ||||
| #### Rotating files | ||||
| ```c++ | ||||
| #include "spdlog/sinks/rotating_file_sink.h" | ||||
| void rotating_example() | ||||
| { | ||||
|     // Create a file rotating logger with 5mb size max and 3 rotated files | ||||
|     auto rotating_logger = spdlog::rotating_logger_mt("some_logger_name", "logs/rotating.txt", 1048576 * 5, 3); | ||||
| } | ||||
| ``` | ||||
|  | ||||
| --- | ||||
| #### Daily files | ||||
| ```c++ | ||||
|  | ||||
| #include "spdlog/sinks/daily_file_sink.h" | ||||
| void daily_example() | ||||
| { | ||||
|     // Create a daily logger - a new file is created every day on 2:30am | ||||
|     auto daily_logger = spdlog::daily_logger_mt("daily_logger", "logs/daily.txt", 2, 30); | ||||
| } | ||||
|  | ||||
| ``` | ||||
|  | ||||
| --- | ||||
| #### Backtrace support | ||||
| ```c++ | ||||
| // Loggers can store in a ring buffer all messages (including debug/trace) and display later on demand. | ||||
| // When needed, call dump_backtrace() to see them | ||||
| spdlog::enable_backtrace(32); // create ring buffer with capacity of 32  messages | ||||
| // or my_logger->enable_backtrace(32).. | ||||
| for(int i = 0; i < 100; i++) | ||||
| { | ||||
|   spdlog::debug("Backtrace message {}", i); // not logged yet.. | ||||
| } | ||||
| // e.g. if some error happened: | ||||
| spdlog::dump_backtrace(); // log them now! show the last 32 messages | ||||
|  | ||||
| // or my_logger->dump_backtrace(32).. | ||||
| ``` | ||||
|  | ||||
| --- | ||||
| #### Periodic flush | ||||
| ```c++ | ||||
| // periodically flush all *registered* loggers every 3 seconds: | ||||
| // warning: only use if all your loggers are thread safe! | ||||
| spdlog::flush_every(std::chrono::seconds(3)); | ||||
|  | ||||
| ``` | ||||
|  | ||||
| --- | ||||
| #### Log binary data in hex | ||||
| ```c++ | ||||
| // many types of std::container<char> types can be used. | ||||
| // ranges are supported too. | ||||
| // format flags: | ||||
| // {:X} - print in uppercase. | ||||
| // {:s} - don't separate each byte with space. | ||||
| // {:p} - don't print the position on each line start. | ||||
| // {:n} - don't split the output to lines. | ||||
|  | ||||
| #include "spdlog/fmt/bin_to_hex.h" | ||||
|  | ||||
| void binary_example() | ||||
| { | ||||
|     auto console = spdlog::get("console"); | ||||
|     std::array<char, 80> buf; | ||||
|     console->info("Binary example: {}", spdlog::to_hex(buf)); | ||||
|     console->info("Another binary example:{:n}", spdlog::to_hex(std::begin(buf), std::begin(buf) + 10)); | ||||
|     // more examples: | ||||
|     // logger->info("uppercase: {:X}", spdlog::to_hex(buf)); | ||||
|     // logger->info("uppercase, no delimiters: {:Xs}", spdlog::to_hex(buf)); | ||||
|     // logger->info("uppercase, no delimiters, no position info: {:Xsp}", spdlog::to_hex(buf)); | ||||
| } | ||||
|  | ||||
| ``` | ||||
|  | ||||
| --- | ||||
| #### Logger with multi sinks - each with different format and log level | ||||
| ```c++ | ||||
|  | ||||
| // create logger with 2 targets with different log levels and formats. | ||||
| // the console will show only warnings or errors, while the file will log all. | ||||
| void multi_sink_example() | ||||
| { | ||||
|     auto console_sink = std::make_shared<spdlog::sinks::stdout_color_sink_mt>(); | ||||
|     console_sink->set_level(spdlog::level::warn); | ||||
|     console_sink->set_pattern("[multi_sink_example] [%^%l%$] %v"); | ||||
|  | ||||
|     auto file_sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>("logs/multisink.txt", true); | ||||
|     file_sink->set_level(spdlog::level::trace); | ||||
|  | ||||
|     spdlog::logger logger("multi_sink", {console_sink, file_sink}); | ||||
|     logger.set_level(spdlog::level::debug); | ||||
|     logger.warn("this should appear in both console and file"); | ||||
|     logger.info("this message should not appear in the console, only in the file"); | ||||
| } | ||||
| ``` | ||||
|  | ||||
| --- | ||||
| #### Asynchronous logging | ||||
| ```c++ | ||||
| #include "spdlog/async.h" | ||||
| #include "spdlog/sinks/basic_file_sink.h" | ||||
| void async_example() | ||||
| { | ||||
|     // default thread pool settings can be modified *before* creating the async logger: | ||||
|     // spdlog::init_thread_pool(8192, 1); // queue with 8k items and 1 backing thread. | ||||
|     auto async_file = spdlog::basic_logger_mt<spdlog::async_factory>("async_file_logger", "logs/async_log.txt"); | ||||
|     // alternatively: | ||||
|     // auto async_file = spdlog::create_async<spdlog::sinks::basic_file_sink_mt>("async_file_logger", "logs/async_log.txt");    | ||||
| } | ||||
|  | ||||
| ``` | ||||
|  | ||||
| --- | ||||
| #### Asynchronous logger with multi sinks   | ||||
| ```c++ | ||||
| #include "spdlog/sinks/stdout_color_sinks.h" | ||||
| #include "spdlog/sinks/rotating_file_sink.h" | ||||
|  | ||||
| void multi_sink_example2() | ||||
| { | ||||
|     spdlog::init_thread_pool(8192, 1); | ||||
|     auto stdout_sink = std::make_shared<spdlog::sinks::stdout_color_sink_mt >(); | ||||
|     auto rotating_sink = std::make_shared<spdlog::sinks::rotating_file_sink_mt>("mylog.txt", 1024*1024*10, 3); | ||||
|     std::vector<spdlog::sink_ptr> sinks {stdout_sink, rotating_sink}; | ||||
|     auto logger = std::make_shared<spdlog::async_logger>("loggername", sinks.begin(), sinks.end(), spdlog::thread_pool(), spdlog::async_overflow_policy::block); | ||||
|     spdlog::register_logger(logger); | ||||
| } | ||||
| ``` | ||||
|   | ||||
| --- | ||||
| #### User defined types | ||||
| ```c++ | ||||
| // user defined types logging by implementing operator<< | ||||
| #include "spdlog/fmt/ostr.h" // must be included | ||||
| struct my_type | ||||
| { | ||||
|     int i; | ||||
|     template<typename OStream> | ||||
|     friend OStream &operator<<(OStream &os, const my_type &c) | ||||
|     { | ||||
|         return os << "[my_type i=" << c.i << "]"; | ||||
|     } | ||||
| }; | ||||
|  | ||||
| void user_defined_example() | ||||
| { | ||||
|     spdlog::get("console")->info("user defined type: {}", my_type{14}); | ||||
| } | ||||
|  | ||||
| ``` | ||||
| --- | ||||
| #### Custom error handler | ||||
| ```c++ | ||||
| void err_handler_example() | ||||
| { | ||||
|     // can be set globally or per logger(logger->set_error_handler(..)) | ||||
|     spdlog::set_error_handler([](const std::string &msg) { spdlog::get("console")->error("*** LOGGER ERROR ***: {}", msg); }); | ||||
|     spdlog::get("console")->info("some invalid message to trigger an error {}{}{}{}", 3); | ||||
| } | ||||
|  | ||||
| ``` | ||||
| --- | ||||
| #### syslog  | ||||
| ```c++ | ||||
| #include "spdlog/sinks/syslog_sink.h" | ||||
| void syslog_example() | ||||
| { | ||||
|     std::string ident = "spdlog-example"; | ||||
|     auto syslog_logger = spdlog::syslog_logger_mt("syslog", ident, LOG_PID); | ||||
|     syslog_logger->warn("This is warning that will end up in syslog."); | ||||
| } | ||||
| ``` | ||||
| --- | ||||
| #### Android example  | ||||
| ```c++ | ||||
| #include "spdlog/sinks/android_sink.h" | ||||
| void android_example() | ||||
| { | ||||
|     std::string tag = "spdlog-android"; | ||||
|     auto android_logger = spdlog::android_logger_mt("android", tag); | ||||
|     android_logger->critical("Use \"adb shell logcat\" to view this message."); | ||||
| } | ||||
| ``` | ||||
|  | ||||
| ## Benchmarks | ||||
|  | ||||
| Below are some [benchmarks](https://github.com/gabime/spdlog/blob/v1.x/bench/bench.cpp) done in Ubuntu 64 bit, Intel i7-4770 CPU @ 3.40GHz | ||||
|  | ||||
| #### Synchronous mode | ||||
| ``` | ||||
| [info] ************************************************************** | ||||
| [info] Single thread, 1,000,000 iterations | ||||
| [info] ************************************************************** | ||||
| [info] basic_st         Elapsed: 0.17 secs        5,777,626/sec | ||||
| [info] rotating_st      Elapsed: 0.18 secs        5,475,894/sec | ||||
| [info] daily_st         Elapsed: 0.20 secs        5,062,659/sec | ||||
| [info] empty_logger     Elapsed: 0.07 secs       14,127,300/sec | ||||
| [info] ************************************************************** | ||||
| [info] C-string (400 bytes). Single thread, 1,000,000 iterations | ||||
| [info] ************************************************************** | ||||
| [info] basic_st         Elapsed: 0.41 secs        2,412,483/sec | ||||
| [info] rotating_st      Elapsed: 0.72 secs        1,389,196/sec | ||||
| [info] daily_st         Elapsed: 0.42 secs        2,393,298/sec | ||||
| [info] null_st          Elapsed: 0.04 secs       27,446,957/sec | ||||
| [info] ************************************************************** | ||||
| [info] 10 threads sharing same logger, 1,000,000 iterations | ||||
| [info] ************************************************************** | ||||
| [info] basic_mt         Elapsed: 0.60 secs        1,659,613/sec | ||||
| [info] rotating_mt      Elapsed: 0.62 secs        1,612,493/sec | ||||
| [info] daily_mt         Elapsed: 0.61 secs        1,638,305/sec | ||||
| [info] null_mt          Elapsed: 0.16 secs        6,272,758/sec | ||||
| ``` | ||||
| #### ASynchronous mode | ||||
| ``` | ||||
| [info] ------------------------------------------------- | ||||
| [info] Messages     : 1,000,000 | ||||
| [info] Threads      : 10 | ||||
| [info] Queue        : 8,192 slots | ||||
| [info] Queue memory : 8,192 x 272 = 2,176 KB  | ||||
| [info] Total iters  : 3 | ||||
| [info] ------------------------------------------------- | ||||
| [info]  | ||||
| [info] ********************************* | ||||
| [info] Queue Overflow Policy: block | ||||
| [info] ********************************* | ||||
| [info] Elapsed: 1.70784 secs     585,535/sec | ||||
| [info] Elapsed: 1.69805 secs     588,910/sec | ||||
| [info] Elapsed: 1.7026 secs      587,337/sec | ||||
| [info]  | ||||
| [info] ********************************* | ||||
| [info] Queue Overflow Policy: overrun | ||||
| [info] ********************************* | ||||
| [info] Elapsed: 0.372816 secs    2,682,285/sec | ||||
| [info] Elapsed: 0.379758 secs    2,633,255/sec | ||||
| [info] Elapsed: 0.373532 secs    2,677,147/sec | ||||
|  | ||||
| ``` | ||||
|  | ||||
| ## Documentation | ||||
| Documentation can be found in the [wiki](https://github.com/gabime/spdlog/wiki/1.-QuickStart) pages. | ||||
|   | ||||
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