extracted base logger class to vstd

include/vstd/CLoggerBase.h

@@ -0,0 +1,61 @@
+/*
+ * CLoggerBase.h, part of VCMI engine
+ *
+ * Authors: listed in file AUTHORS in main folder
+ *
+ * License: GNU General Public License v2.0 or later
+ * Full text of license available in license.txt file, in main folder
+ *
+ */
+
+#pragma once
+
+namespace ELogLevel
+{
+	enum ELogLevel
+	{
+		NOT_SET = 0,
+		TRACE,
+		DEBUG,
+		INFO,
+		WARN,
+		ERROR
+	};
+}
+
+namespace vstd
+{
+	class DLL_LINKAGE CLoggerBase
+	{
+	public:
+		virtual ~CLoggerBase(){};
+
+		virtual void log(ELogLevel::ELogLevel level, const std::string & message) const = 0;
+
+		/// Log methods for various log levels
+		inline void trace(const std::string & message) const
+		{
+			log(ELogLevel::TRACE, message);
+		};
+
+		inline void debug(const std::string & message) const
+		{
+			log(ELogLevel::DEBUG, message);
+		};
+
+		inline void info(const std::string & message) const
+		{
+			log(ELogLevel::INFO, message);
+		};
+
+		inline void warn(const std::string & message) const
+		{
+			log(ELogLevel::WARN, message);
+		};
+
+		inline void error(const std::string & message) const
+		{
+			log(ELogLevel::ERROR, message);
+		};
+	};
+}