a bit of further work

lexer.h

@@ -54,12 +54,6 @@ struct Token {
 };
 
 class Lexer {
-private:
-	std::string code_str;
-	std::vector<Token> tokens;
-	int index = 0;
-	bool eof = false;
-
 public:
 	Lexer() {};
 
@@ -84,4 +78,10 @@ private:
 	TokenType type(const std::string &token);
 	std::string stringLiteral(std::string token);
 	static std::string typeToString(TokenType token_type);
+
+
+private:
+    std::string m_code_str;
+    std::vector<Token> m_tokens;
+    int m_index = 0;
 };