Created
December 17, 2018 23:00
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C++ Logger Concept
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| #include <string> | |
| #include <sstream> | |
| #include <iostream> | |
| enum LogLevel | |
| { | |
| Info = 0, | |
| Debug, | |
| Warning, | |
| Error | |
| }; | |
| const std::string LogLevelNames[4] = { "INFO", "DEBUG", "WARN", "ERROR" }; | |
| #define LOG_DEBUG(s, ...) Logger::Get().Log(LogLevel::Debug, __LINE__, __FILE__, s, __VA_ARGS__) | |
| class Logger | |
| { | |
| public: | |
| static Logger& Get() | |
| { | |
| static Logger instance; | |
| return instance; | |
| } | |
| template<typename T, typename... U> | |
| void Log(LogLevel const level, int line, const char* file, T first, U... args) | |
| { | |
| m_CurrentMessage.str(std::string()); | |
| m_CurrentMessage << "[" << LogLevelNames[level] << "] " << first; | |
| BuildMessage(args...); | |
| m_CurrentMessage << " (" << file << " @ " << line << ") "; | |
| if (level == LogLevel::Debug) | |
| { | |
| #ifdef _DEBUG | |
| std::cout << m_CurrentMessage.str() << std::endl; | |
| #endif | |
| } | |
| else | |
| { | |
| std::cout << m_CurrentMessage.str() << std::endl; | |
| } | |
| } | |
| protected: | |
| private: | |
| template<typename T, typename... U> | |
| void BuildMessage(T first, U... last) | |
| { | |
| m_CurrentMessage << first; | |
| BuildMessage(last...); | |
| } | |
| void BuildMessage() | |
| { | |
| } | |
| std::stringstream m_CurrentMessage; | |
| }; | |
| int main() | |
| { | |
| LOG_DEBUG("Hello World, this is a number: ", 100); | |
| return 0; | |
| } |
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The above outputs:
A concept for a basic logger with the following attributes:
Obviously there is more to be added to it, and it's not thread-safe, but it serves as a basic proof.