LoggerC++ (LoggerCpp) is a simple, elegant and efficient C++ logger library.
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LoggerC++ (LoggerCpp) is a simple, elegant and efficient C++ logger library.

The goals of LoggerC++ are:

  • to keep dependencies to a minimum (STL and shared_ptr)
  • to be portable
  • to minimize cpu utilisation when no log are outputed
  • to be thread-safe (output logs in same channel accross multiple threads)
  • to be well documented with Doxygen tags
  • to use a permissive MIT license, similar to BSD or Boost, for proprietary/commercial usage


Thread-safety is only for Log outputs. You shall not dynamically create and destroy Logger objects in multiple threads. Instead, build them all at startup in you main thread, before other thread startup. Then you are allowed to use them all in parallel.

### Suported platforms:

Developements and tests are done under the following OSs :

  • Debian 7 (testing)
  • Ubuntu 12.10
  • Windows XP/7/8 And following IDEs/Compilers
  • GCC 4.7.x with a provided Makefile
  • Eclipse CDT under Linux, using the provided Makefile
  • Visual Studio Express 2008/2010/2012 for testing compatibility purpose


  • a STL implementation with RTTI (even an old one, like the one provided with VC6 should work).
  • optionnaly: the C++ 11 std::shared_ptr or boost::shared_ptr (a minimal shared_ptr implementation is provided).


To use this C++ Logger, you need to include the sources files into your project codebase.


Copyright (c) 2013 Sébastien Rombauts (sebastien.rombauts@gmail.com)

Distributed under the MIT License (MIT) (See accompanying file LICENSE.txt or copy at http://opensource.org/licenses/MIT)

Getting started


  • Add a small named Logger object to your code to output logs prefixed by the given name. A Logger is as small as a shared_ptr, typicaly 8 bytes. Use it as a member variable to your class, or as a free variable.
  • Build a Log with standard stream manipulations (like with std::cout) but in a thread-safe manner: the Log is outputed atomically at the end of the line.
  • Use one of the 6 Log Level, ranging from Debug to Critic in a standard fashion.
  • Set the Channel Level of the Logger to dynamicaly filter Log to be outputed
  • Multiple Logger objects with the same name will share the same underlying named Channel. Any of theses Logger can manipulate the Channel output Level.
  • Configure the availlable Output objects, for console, file or MSVC Debugger output.

First sample demonstrates how to create a Logger and print some logs:

int main ()
    // Configure the default severity Level of new Channel objects

    // Setup the list of Config for the Output objects,
    Log::Config::Vector configList;
    Log::Config::addOutput(configList, "OutputConsole");
    Log::Config::addOutput(configList, "OutputFile");
    Log::Config::setOption(configList, "filename",          "log.txt");
    Log::Config::setOption(configList, "max_size",          "10000");
    // and configure the Log Manager (create the Output objects)
    // Create a Logger object, using a "Main.Example" Channel
    Log::Logger logger("Main.Example");
    // Test outputs of various kind of variables, and some common stream manipulations.
    std::string     str("string");
    unsigned int    ui  = 123;
    double          dbl = -0.023f;
    logger.debug() << "Variables ; '" << str << "', '" << ui << "', '" << dbl << "'";
    logger.debug() << "Hexa = " << std::hex << 0x75af0 << " test";
    logger.debug() << "Deci = " << std::right << std::setfill('0') << std::setw(8) << 76035 << " test";

    // Test outputs of various severity Level
    logger.debug()  << "Debug.";
    logger.info()   << "Info.";
    logger.notice() << "Notice.";
    logger.warning()<< "Warning.";
    logger.error()  << "Error.";
    logger.critic() << "Critic.";
    // Modify the output Level of the underlying Channel, and test various severity Level again
    logger.debug()  << "NO Debug.";     // NO more debug logs
    logger.info()   << "NO Info.";      // NO more info logs
    logger.notice() << "NO Notice.";    // NO more notice logs
    logger.warning()<< "Warning.";
    logger.error()  << "Error.";
    logger.critic() << "Critic.";

    // Reset Level of the "Main.example" channel by its name

How to contribute

GitHub website

The most efficient way to help and contribute to this wrapper project is to use the tools provided by GitHub:


You can also email me directly, I will answer any questions and requests.

Coding Style Guidelines

The source code use the CamelCase naming style variant where :

  • type names (class, struct, typedef, enums...) begins with a capital letter
  • files (.cpp/.h) are named like the class they contains
  • function and variable names begins with a lower case letter
  • member variables begins with a 'm', function arguments begins with a 'a', boolean with a 'b', pointers with a 'p'
  • each file, class, method and member variable is documented using Doxygen tags See also http://www.appinf.com/download/CppCodingStyleGuide.pdf for good guidelines

### Continuous Integration

This project is continuously tested under Ubuntu Linux with the gcc and clang compilers using the Travis CI community service with the above CMake building and testing procedure.

Detailed results can be seen online: https://travis-ci.org/SRombauts/LoggerCpp