add logging engine

add options to control harris algorithum

log.h

@@ -0,0 +1,76 @@
+#pragma once
+#include <iostream>
+#include <string>
+
+class Log 
+{
+public:
+	
+	enum Level
+	{
+		DEBUG,
+		INFO,
+		WARN,
+		ERROR
+	};
+
+private:
+	bool opened = false;
+	Level msglevel = DEBUG;
+
+	inline std::string getLabel(Level level) 
+	{
+		std::string label;
+		switch(level) 
+		{
+			case DEBUG: 
+				label = "DEBUG"; 
+				break;
+			case INFO:  
+				label = "INFO "; 
+				break;
+			case WARN:  
+				label = "WARN "; 
+				break;
+			case ERROR: 
+				label = "ERROR"; 
+				break;
+		}
+		return label;
+	}
+	
+public:
+
+
+	inline static bool headers = false;
+	inline static Level level = WARN;
+
+	Log() {}
+	Log(Level type)
+	{
+		msglevel = type;
+		if(headers) 
+		{
+			operator << ("["+getLabel(type)+"]");
+		}
+	}
+	
+	~Log() 
+	{
+		if(opened) 
+		{
+			std::cout<<'\n';
+		}
+		opened = false;
+	}
+	
+	template<class T> Log &operator<<(const T &msg) 
+	{
+		if(msglevel >= level) 
+		{
+			std::cout<<msg;
+			opened = true;
+		}
+		return *this;
+	}
+};