Some more stdlib (array and vector, untested so far).

stdlib/include/utility

@@ -0,0 +1,40 @@
+
+#pragma once
+
+#if !defined(BAD_APPLE_OS_UTILITY_INCLUDED)
+#define BAD_APPLE_OS_UTILITY_INCLUDED
+
+#include "type_traits"
+
+namespace std
+{
+template<typename T>
+constexpr remove_reference_t<T>&& move(T&& val) noexcept
+{
+    return static_cast<remove_reference_t<T>&&>(val);
+}
+
+template<typename T>
+constexpr void swap(T& first, T& second)
+{
+    T temp = std::move(first);
+    first = std::move(second);
+    second = std::move(temp);
+}
+
+template<typename T>
+[[nodiscard]] constexpr T&& forward(remove_reference_t<T>& value)
+{
+    return static_cast<T&&>(value);
+}
+
+template<typename T, typename U = T>
+[[nodiscard]] constexpr T exchange(T& obj, U&& newValue)
+{
+    T oldValue = std::move(obj);
+    obj = std::forward<U>(newValue);
+    return oldValue;
+}
+}
+
+#endif // !defined(BAD_APPLE_OS_UTILITY_INCLUDED)