jazz up Coord

lib/include/intcode/Coord.hpp

@@ -0,0 +1,71 @@
+#ifndef INTCODE_COORD_HPP_
+#define INTCODE_COORD_HPP_
+
+#include <functional>
+#include <map>
+#include <ostream>
+#include <tuple>
+
+#include <intcode/Machine.hpp>
+
+namespace intcode {
+
+/// Cartesian coordinate
+///
+/// Coordinate where y grows down and x grows right
+struct Coord {
+  std::int64_t x, y;
+  auto operator<=>(const Coord&) const = default;
+};
+
+
+auto Draw(std::ostream & out, std::map<Coord, ValueType> image) -> void;
+
+/// Move one unit up
+auto Up(Coord) -> Coord;
+
+/// Move one unit down
+auto Down(Coord) -> Coord;
+
+/// Move one unit left
+auto Left(Coord) -> Coord;
+
+/// Move one unit right
+auto Right(Coord) -> Coord;
+
+/// Mirror coordinates about y=x line
+auto Invert(Coord) -> Coord;
+
+/// Rotate clockwise
+auto CW(Coord) -> Coord;
+
+/// Rotate counter-clockwise
+auto CCW(Coord) -> Coord;
+
+/// Add two coordinates pairwise
+auto operator+(Coord, Coord) -> Coord;
+
+/// Subtract two coordinates pairwise
+auto operator-(Coord, Coord) -> Coord;
+
+/// Compound assignment addition of coordinates
+auto operator+=(Coord &, Coord) -> Coord &;
+
+/// Compound assignment subtraction of coordinates
+auto operator-=(Coord &, Coord) -> Coord &;
+
+/// Write a coordinate to a string "(x,y)"
+auto operator<<(std::ostream &, Coord) -> std::ostream &;
+
+} // namespace
+
+template<>
+struct std::hash<intcode::Coord>
+{
+  auto operator()(intcode::Coord const& c) const noexcept -> std::size_t {
+    std::hash<std::int64_t> h;
+    return h(c.x) ^ h(c.y);
+  }
+};
+
+#endif

lib/include/intcode/Grid.hpp

@@ -1,27 +0,0 @@
-#ifndef INTCODE_GRID_HPP_
-#define INTCODE_GRID_HPP_
-
-#include <ostream>
-#include <map>
-#include <tuple>
-
-#include <intcode/Machine.hpp>
-
-namespace intcode {
-
-using Coord = std::pair<ValueType, ValueType>;
-
-auto Draw(std::ostream & out, std::map<Coord, ValueType> image) -> void;
-
-auto Up(Coord) -> Coord;
-auto Down(Coord) -> Coord;
-auto Left(Coord) -> Coord;
-auto Right(Coord) -> Coord;
-auto CW(Coord) -> Coord;
-auto CCW(Coord) -> Coord;
-auto Add(Coord, Coord) -> Coord;
-
-
-} // namespace
-
-#endif