From 27ad2a900c667b9d0b4c1cd5e7254884d4bd72a4 Mon Sep 17 00:00:00 2001
From: Bob Polis <rpb.polis@avans.nl>
Date: Tue, 22 Sep 2020 10:50:07 +0200
Subject: [PATCH] changed all prog indices to size_t; added explanatory
 comments to ivars

---
 interpreter.hpp | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/interpreter.hpp b/interpreter.hpp
index f9ace33..ad0049a 100644
--- a/interpreter.hpp
+++ b/interpreter.hpp
@@ -32,13 +32,13 @@ class interpreter {
         std::string eval(std::istream& in, bool& done);
 
     private:
-        std::vector<std::string> _prog;
-        std::vector<std::string> _stack;
-        std::map<std::string, int> _labels;
-        std::map<std::string, std::string> _vars;
-        std::vector<int> _calls;
-        std::vector<std::string>::size_type _pc {0};
-        std::vector<size_t> _pc_offsets;
+        std::vector<std::string> _prog; // program lines without label defs or comments
+        std::vector<std::string> _stack; // value stack
+        std::map<std::string, size_t> _labels; // label name => prog line index
+        std::map<std::string, std::string> _vars; // var name => string value
+        std::vector<size_t> _calls; // call stack
+        size_t _pc {0}; // current program counter (index into _prog)
+        std::vector<size_t> _pc_offsets; // removed line indices for prog index => source line
 
         void reset();
         void exec_instruction(const std::string& code, bool& done);