[nostalgia/common] Add Vec2 type

src/nostalgia/common/CMakeLists.txt

@@ -2,6 +2,7 @@
 add_library(
 	NostalgiaCommon
 		bounds.cpp
+		vec.cpp
 )
 
 install(
@@ -18,6 +19,7 @@ install(
 		common.hpp
 		point.hpp
 		size.hpp
+		vec.hpp
 	DESTINATION
 		include/nostalgia/common
 )

src/nostalgia/common/vec.cpp

@@ -0,0 +1,18 @@
+/*
+ * Copyright 2016 - 2022 Gary Talent (gary@drinkingtea.net). All rights reserved.
+ */
+
+#include <ox/std/defines.hpp>
+
+#include "vec.hpp"
+
+namespace nostalgia::common {
+
+#ifndef OX_OS_BareMetal // doesn't compile in devKitPro for some reason
+static_assert([] {
+	Vec2 v(1, 2);
+	return v.x == 1 && v.y == 2 && v[0] == 1 && v[1] == 2;
+});
+#endif
+
+}

src/nostalgia/common/vec.hpp

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2016 - 2022 Gary Talent (gary@drinkingtea.net). All rights reserved.
+ */
+
+#pragma once
+
+#if __has_include(<imgui.h>)
+#include <imgui.h>
+#endif
+
+#include <ox/std/types.hpp>
+
+namespace nostalgia::common {
+
+struct Vec2 {
+	float x = 0;
+	float y = 0;
+
+	constexpr Vec2() noexcept = default;
+
+	constexpr Vec2(float pX, float pY) noexcept: x(pX), y(pY) {
+	}
+
+#if __has_include(<imgui.h>)
+	explicit constexpr Vec2(const ImVec2 &v) noexcept: x(v.x), y(v.y) {
+	}
+#endif
+
+	constexpr auto &operator[](std::size_t i) noexcept {
+		return (&x)[i];
+	}
+
+	constexpr const auto &operator[](std::size_t i) const noexcept {
+		return (&x)[i];
+	}
+
+#if __has_include(<imgui.h>)
+	explicit operator ImVec2() const noexcept {
+		return {x, y};
+	}
+#endif
+};
+
+}