not implemented yet

include/symbol_table.hpp

@@ -1,5 +1,5 @@
 #pragma once
-#ifdef SYMBOL_TABLE_HPP
+#ifndef SYMBOL_TABLE_HPP
 #define SYMBOL_TABLE_HPP
 
 #include <unordered_map>
@@ -7,11 +7,34 @@
 class symbol_table
 {
 private:
-    std::unordered_map<std::string, int> symbols;
+    std::unordered_map<std::string, int> symbols = {
+        {"R0", 0},
+        {"R1", 1},
+        {"R2", 2},
+        {"R3", 3},
+        {"R4", 4},
+        {"R5", 5},
+        {"R6", 6},
+        {"R7", 7},
+        {"R8", 8},
+        {"R9", 9},
+        {"R10", 10},
+        {"R11", 11},
+        {"R12", 12},
+        {"R13", 13},
+        {"R14", 14},
+        {"R15", 15},
+        {"SP", 0},
+        {"LCL", 1},
+        {"ARG", 2},
+        {"THIS", 3},
+        {"THAT", 4},
+        {"SCREEN", 16384},
+        {"KBD", 24576},
+    };
 
 public:
-    symbol_table();
-    ~symbol_table();
+    symbol_table() {}
 
     void add_entry(std::string symbol, int address);
     bool contains(std::string symbol);

src/symbol_table.cpp

@@ -1 +1,22 @@
-#include "../include/symbol_table.hpp"
+#include "../include/symbol_table.hpp"
+
+void symbol_table::add_entry(std::string symbol, int address)
+{
+    symbols.insert(std::make_pair(symbol, address));
+}
+
+bool symbol_table::contains(std::string symbol)
+{
+    return !(symbols.find(symbol) == symbols.end());
+}
+
+int symbol_table::get_address(std::string symbol)
+{
+    if (contains(symbol))
+    {
+        return symbols[symbol];
+    }else
+    {
+        return -1;
+    }
+}