Start working on type checker

src/typechecker/typechecker.hpp

@@ -0,0 +1,37 @@
+#pragma once
+
+#include "type.hpp"
+#include "../parser/parser.hpp"
+
+#include <string>
+#include <unordered_map>
+
+namespace Solstice {
+
+    class TypeChecker {
+        std::unordered_map<std::string, Type> variables;
+        std::unordered_map<std::string, Type> types;
+
+        std::unordered_map<TypePair, Type> addOverloads;
+        std::unordered_map<TypePair, Type> subtractOverloads;
+        std::unordered_map<TypePair, Type> multiplyOverloads;
+        std::unordered_map<TypePair, Type> divideOverloads;
+        std::unordered_map<TypePair, Type> equalOverloads;
+        std::unordered_map<TypePair, Type> notEqualOverloads;
+        std::unordered_map<TypePair, Type> greaterThanOverloads;
+        std::unordered_map<TypePair, Type> lesserThanOverloads;
+
+        Node& input;
+
+        void initOverloads();
+
+        public:
+
+        TypeChecker() = delete;
+        TypeChecker(Node& node) : input(node) {
+            initOverloads();
+        }
+
+        void checkTypes();
+    };
+}