Logging.hpp

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#ifndef AI_TOOLBOX_LOGGING_HEADER_FILE
#define AI_TOOLBOX_LOGGING_HEADER_FILE
 
#ifndef AI_LOGGING_ENABLED
#define AI_LOGGING_ENABLED 0
#endif
 
#define AI_SEVERITY_DEBUG   0
#define AI_SEVERITY_INFO    1
#define AI_SEVERITY_WARNING 2
#define AI_SEVERITY_ERROR   3
 
#if AI_LOGGING_ENABLED == 1
 
#include <sstream>
 
namespace AIToolbox {
    // ##################################################################
    //
    // THESE HERE ARE THE ONLY THINGS YOU NEED TO CARE ABOUT IN YOUR OWN
    // PROGRAMS IN THIS ENTIRE FILE. THE REST ARE IMPLEMENTATION DETAILS!
    //
    using AILoggerFun = void(int, const char *);
    inline AILoggerFun * AILogger = nullptr;
    //
    //
    // ##################################################################
 
    namespace Impl {
        // We use this to dump logs in.
        inline char logBuffer[500] = {0};
    }
}
 
#else
// Fake logger to keep static checks
namespace AIToolbox::Impl {
    struct FakeLogger {
        FakeLogger(int) {}
        template <typename T>
        FakeLogger & operator<<(const T&) { return *this; }
    };
}
 
#endif
 
#if AI_LOGGING_ENABLED == 1
// Actual logging if logging is enabled.
#define AI_LOGGER(SEV, ARGS)                                \
    do {                                                    \
        if (AILogger) {                                     \
            std::stringstream internal_stringstream_;       \
            internal_stringstream_.rdbuf()->pubsetbuf(      \
                AIToolbox::Impl::logBuffer,                 \
                sizeof(AIToolbox::Impl::logBuffer) - 1      \
            );                                              \
            internal_stringstream_ << ARGS << '\0';         \
            AILogger(SEV, AIToolbox::Impl::logBuffer);      \
        }                                                   \
    } while(0)
 
#else
// Statement to enable static checks on inputs if logging is disabled.
#define AI_LOGGER(SEV, ARGS)                                \
    while (0) {                                             \
        AIToolbox::Impl::FakeLogger(SEV) << ARGS;           \
    }
#endif
 
#endif