i2pd/Log.h

#ifndef LOG_H__
#define LOG_H__

#include <string>
#include <iostream>
#include <sstream>
#include <fstream>
#include <functional>
#include "Queue.h"

struct LogMsg
{
	std::stringstream s;
	std::ostream& output;	

	LogMsg (std::ostream& o = std::cout): output (o) {};
	
	void Process();
};

class Log: public i2p::util::MsgQueue<LogMsg>
{
	public:

		Log (): m_LogFile (nullptr) { SetOnEmpty (std::bind (&Log::Flush, this)); };
		~Log () { delete m_LogFile; };

		void SetLogFile (const std::string& fullFilePath);
		std::ofstream * GetLogFile () const { return m_LogFile; };	

	private:

		void Flush ();

	private:
		
		std::ofstream * m_LogFile;
};

extern Log g_Log;

template<typename TValue>
void LogPrint (std::stringstream& s, TValue arg) 
{
	s << arg;
}
 
template<typename TValue, typename... TArgs>
void LogPrint (std::stringstream& s, TValue arg, TArgs... args) 
{
	LogPrint (s, arg);
	LogPrint (s, args...);
}

template<typename... TArgs>
void LogPrint (TArgs... args) 
{
	LogMsg * msg = g_Log.GetLogFile () ? new LogMsg (*g_Log.GetLogFile ()) : new LogMsg ();
	LogPrint (msg->s, args...);
	msg->s << std::endl;
	g_Log.Put (msg);
}	

#endif