Implement Coord.h

src/coord.cpp

+#include "include/coord.h"
+#include <string>
+
+Coord::Coord(int x, int y)
+	: x(x)
+	, y(y)
+	{}
+
+int& Coord::operator[](int dimension) {
+	switch (dimension) {
+		case 0:
+			return this->x;
+		case 1:
+			return this->y;
+	}
+	throw "bad dimension " + std::to_string(dimension);
+	return this->x;
+}
+
+Coord Coord::operator+(const Coord& other) {
+	return Coord(this->x + other.x, this->y + other.y);
+}
+
+Coord Coord::operator-(const Coord& other) {
+	return Coord(this->x - other.x, this->y - other.y);
+}

src/include/coord.h

@@ -4,9 +4,10 @@
 
 class Coord {
 	public:
+		Coord(int, int);
 		int& operator[](int);
-		Coord operator+(Coord);
-		Coord operator-(Coord);
+		Coord operator+(const Coord&);
+		Coord operator-(const Coord&);
 
 	private:
 		int x;