basic-cpp-logger

Basic C++11 logging header.

Example useage

#include "logger/logger.h"
using namespace logging;

void something(int a) {
    DebugLogger(std::cout, "a has a value of", a);

    if(a != 0)
        InfoLogger("a is not 0");

    if(a > 25)
        WarningLogger("Oh goodness a is greater than 25!")

    if(a > 50)
        ErrorLogger(std::cerr, "a cannot be greater than 50!")

    if(a >= 100) {
        CriticalLogger(std::cerr, "a is greater or equal to 100, shutting down!");
        exit(-1);
    }
}

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When something is called with a value of 100 (so it hits all loggers).

When compiled with no specific flags you can expect to see:

[Error] a cannot be greater than 50!
[Critical] a is greater or equal to 100, shutting down!

When compiled with NO_LOGGING being defined, nothing will print and the program will simply exit (this overrides all other flags).

When compiled with DEBUG or LOG_EVERYTHING

[Debug] a has a value of 100
[Info] a is not 0
[Warning] Oh goodness a is greather than 25!
[Error] a cannot be greater than 50!
[Critical] a is greater or equal to 100, shutting down!

You can turn off certain loggers aswell, i.e compiling with LOG_EVERYTHING and NO_INFO_LOGGING we get:

[Debug] a has a value of 100
[Warning] Oh goodness a is greather than 25!
[Error] a cannot be greater than 50!
[Critical] a is greater or equal to 100, shutting down!

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This is of course intended so that if a logger isn't active, it isn't simply skipped at run time, but is ommited at compile time, so hopefully there shouldn't be any cost adding it to code if you aren't using it.

You can specify an std::ostream as the first argument, otherwise it falls back to using std::cerr.

The loggers can handle mulitple arguments and attempts to pass them directly to the ostream it's trying to print to.

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List of flags

Flag	Effect
USE_DEBUG_LOGGER	Turns on the Debug logger. And by default turns on Info, Warning, Error and Critical loggers.
USE_INFO_LOGGER	Turns on the Info logger. And by default turns on Warning, Error and Critical loggers.
USE_WARNING_LOGGER	Turns on the Warning logger. And by default turns on Error and Critical loggers.
USE_ERROR_LOGGER	Turns on the Error logger. And by default turns on the Critical logger. (Enabled by default)
USE_CRITICAL_LOGGER	Turns on the Critical logger. (Enabled by default)
LOG_EVERYTHING / DEBUG	Effectively USE_DEBUG_LOGGER

Flag	Effect
NO_DEBUG_LOGGING	Turns off the Debug logger.
NO_INFO_LOGGING	Turns off the Info logger.
NO_WARNING_LOGGING	Turns off the Warning logger.
NO_ERROR_LOGGING	Turns off the Error logger.
NO_CRITICAL_LOGGING	Turns off the Critical logger.
NO_LOGGING	Turns off all loggers.