SimpleNES/include/Log.h

#ifndef LOG_H
#define LOG_H
#include <iostream>
#include <string>
#include <fstream>
#include <memory>
#include <cstring>

#ifndef __FILENAME__
#define __FILENAME__ __FILE__
#endif

#define LOG(level) \
if (level > sn::Log::get().getLevel()) ; \
else sn::Log::get().getStream() << '[' << __FILENAME__ << ":" << std::dec << __LINE__ << "] "

#define LOG_CPU \
if (sn::CpuTrace != sn::Log::get().getLevel()) ; \
else sn::Log::get().getCpuTraceStream()

namespace sn
{
    enum Level
    {
        None,
        Error,
        Info,
        InfoVerbose,
        CpuTrace
    };
    class Log
    {
    public:
        ~Log();
        void setLogStream(std::ostream& stream);
        void setCpuTraceStream(std::ostream& stream);
        Log& setLevel(Level level);
        Level getLevel();

        std::ostream& getStream();
        std::ostream& getCpuTraceStream();

        static Log& get();
    private:
        Level m_logLevel;
        std::ostream* m_logStream;
        std::ostream* m_cpuTrace;
    };

    //Courtesy of http://wordaligned.org/articles/cpp-streambufs#toctee-streams
    class TeeBuf : public std::streambuf
    {
        public:
            // Construct a streambuf which tees output to both input
            // streambufs.
            TeeBuf(std::streambuf* sb1, std::streambuf* sb2);
        private:
            // This tee buffer has no buffer. So every character "overflows"
            // and can be put directly into the teed buffers.
            virtual int overflow(int c);
            // Sync both teed buffers.
            virtual int sync();
        private:
            std::streambuf* m_sb1;
            std::streambuf* m_sb2;
    };

    class TeeStream : public std::ostream
    {
        public:
            // Construct an ostream which tees output to the supplied
            // ostreams.
            TeeStream(std::ostream& o1, std::ostream& o2);
        private:
            TeeBuf m_tbuf;
    };

};
#endif // LOG_H