log

Logging

This module provides a simple logging utility that can be used to output messages.
The messages has associated framework::log::SeverityLevel that indicate their importance and tags that indicate their domain.

To log message use one of the framework::log::* funcitons. This functions returns a temporary object that behaves like the std::ostream.

log::debug("log_tag") << "message_1" << std::endl;
log::info("log_tag") << "message_2" << std::endl;
log::warning("log_tag") << "message_3" << std::endl;

By default there is no logger implementation, so no messages would be logged.
Call the framework::log::set_logger function to set logger class that would be processing messages. Provided logger must be derived from the framework::log::Logger class.

class MyLogger : public framework::log::Logger
{
public:
    void add_message(framework::log::SeverityLevel level,
                     const std::string& tag,
                     const std::string& message) override
    {
        // implementation
    }
};

framework::log::set_logger(std::make_unique<MyLogger>());

The Logging module provides an implementation of logger: framework::log::StreamLogger that can print messages to any output stream.

set_logger(std::make_unique<framework::log::StreamLogger>(std::cout));