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logger.h

@@ -0,0 +1,71 @@
+#ifndef LOGGER_H
+#define LOGGER_H
+#include <iostream>
+#include <chrono>
+class Logger
+{
+  private:
+	class LogEntry
+	{
+		bool headerSent;
+		std::ostream *out;
+		std::string prefix;
+
+	  public:
+		LogEntry(std::ostream *out, std::string prefix) : out(out), prefix(prefix)
+		{
+		}
+
+		template <class T> LogEntry &operator<<(const T &val)
+		{
+			if(out == nullptr)
+				return *this;
+			if(!headerSent)
+			{
+				(*out) << time(0) << " " << prefix;
+			}
+			(*out) << val;
+			headerSent = true;
+			return *this; // or maybe out itself? probably not.
+		}
+		~LogEntry()
+		{
+			if(out != nullptr)
+			{
+				(*out) << std::endl;
+				(*out).flush();
+			}
+		}
+	};
+
+  public:
+	static std::ostream *out;
+	static int logLevel;
+	static void setStream(std::ostream *out)
+	{
+		Logger::out = out;
+	}
+
+	static LogEntry debug()
+	{
+		if(Logger::logLevel >= 3)
+			return LogEntry(out, "Debug: ");
+
+		return LogEntry(nullptr, "");
+	}
+
+	static LogEntry error()
+	{
+		return LogEntry(out, "Error: ");
+	}
+
+	static LogEntry log()
+	{
+		if(Logger::logLevel >= 2)
+			return LogEntry(out, "Log: ");
+
+		return LogEntry(nullptr, "");
+	}
+};
+
+#endif // LOGGER_H