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log_wrapper.h
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log_wrapper.h
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#ifndef THREAD_SAFE_LOGGER_H
#define THREAD_SAFE_LOGGER_H
#include <iostream>
#include <sstream>
#include <mutex>
class ThreadSafeLogger {
public:
// Deleted copy constructor and assignment operator to ensure singleton properties
ThreadSafeLogger(const ThreadSafeLogger&) = delete;
ThreadSafeLogger& operator=(const ThreadSafeLogger&) = delete;
// Method to get the singleton instance of the logger
static ThreadSafeLogger& getInstance() {
static ThreadSafeLogger instance;
return instance;
}
// Template function for handling various types with the << operator
template<typename T>
ThreadSafeLogger& operator<<(const T& msg) {
#ifndef NDEBUG
std::ostringstream& stream = getThreadLocalStream();
stream << msg;
#endif
return *this;
}
// Flushes the current thread's log stream to std::cout
void flush() {
#ifndef NDEBUG
std::lock_guard<std::mutex> lock(mutex_);
std::ostringstream& stream = getThreadLocalStream();
std::cout << stream.str();
stream.str(""); // Clear the stream buffer after flushing
stream.clear(); // Clear any error flags
#endif
}
private:
ThreadSafeLogger() = default;
static std::ostringstream& getThreadLocalStream() {
thread_local std::ostringstream stream;
return stream;
}
std::mutex mutex_;
};
// Helper function that flushes the log on destruction, ensuring message completion
class LogFlusher {
public:
~LogFlusher() {
ThreadSafeLogger::getInstance().flush();
}
};
// Macro to simplify usage and ensure flush on destruction
#define debug_log LogFlusher(), ThreadSafeLogger::getInstance()
#endif // THREAD_SAFE_LOGGER_H