SimpleLogger

Looking for a simple logger for your C++ project? SimpleLogger might be for you.

Features

• Based on RAII
• Configurable level symbols
• Datetime, ISO Datetime, EPOCH, and custom timestamp formats
• Logging levels: Trace, Debug, Info, Warning, Error, Fatal
• Log to file and/or console
• Thread-safe
• Uses streams (<< operator)
• Very easy to use

Installation

Use from sources

Just add src/simple_logger.hpp and src/simple_logger.cpp to your project and start using it!

Use as a CMake subproject (Recommended)

Copy contents of SimpleLogger under your main project (or clone as a Git submodule).

In your CMakeLists.txt:

add_subdirectory(SimpleLogger EXCLUDE_FROM_ALL)
include_directories(SimpleLogger/src)

Link to the library:

target_link_libraries(${YOUR_TARGET_NAME} SimpleLogger_static)

In your code:

#include "simple_logger.hpp"

Use as a library

Build and install:

$ mkdir build && cd build

$ cmake ..

$ make

$ sudo make install

Link to libSimpleLogger_static.a or libSimpleLogger.so.

Examples

Note: instead of Logger class you can simply use L.

Log to console

using juzzlin::L;

L().info() << "Something happened";

Outputs something like this:

Sat Oct 13 22:38:42 2018 I: Something happened

Log to file and console

using juzzlin::L;

L::initialize("/tmp/myLog.txt");

L().info() << "Something happened";

Log only to file

using juzzlin::L;

L::initialize("/tmp/myLog.txt");
L::enableEchoMode(false);

L().info() << "Something happened";

Set logging level

using juzzlin::L;

L::setLoggingLevel(L::Level::Debug);

L().info() << "Something happened";
L().debug() << "A debug thing happened";

Outputs something like this:

Sat Oct 13 22:38:42 2018 I: Something happened

Sat Oct 13 22:38:42 2018 D: A debug thing happened

Log with a tag

using juzzlin::L;

L::setLoggingLevel(L::Level::Info);

L("MyTag").info() << "Something happened";

Outputs something like this:

Sat Oct 13 22:38:42 2018 I: MyTag: Something happened

Set custom level symbols

using juzzlin::L;

L::setLoggingLevel(L::Level::Debug);
L::setLevelSymbol(L::Level::Debug, "<DEBUG>");

L().debug() << "A debug thing happened";

Outputs something like this:

Sat Oct 13 22:38:42 2018 <DEBUG> A debug thing happened

Set timestamp mode and optional timestamp separator

Possible timestamp modes: None, EpochSeconds, EpochMilliseconds, EpochMicroseconds, DateTime, ISODateTime.

using juzzlin::L;

L::setTimestampMode(L::TimestampMode::EpochMilliseconds);
L::setTimestampSeparator(" ## ");

L().info() << "Something happened";

Outputs something like this:

1562955750677 ## I: Something happened

Set custom timestamp format

By setting a custom timestamp format the timestamp mode is set to Custom:

using juzzlin::L;

L::setCustomTimestampFormat("%H:%M:%S_%Y-%m-%d");
L::setTimestampSeparator(" ## ");

L().info() << "Something happened";

Outputs something like this:

12:34:58_2024-07-06 ## I: Something happened

Set custom output stream

using juzzlin::L;

std::stringstream ssI;
L::setStream(L::Level::Info, ssI);

Requirements

C++17

Licence

MIT

Projects currently using SimpleLogger

• https://github.com/juzzlin/DustRacing2D

• https://github.com/juzzlin/Heimer