Add files via upload

Author: CrabExtra

include/nbl/builtin/hlsl/utility.hlsl

@@ -0,0 +1,70 @@
+// Copyright (C) 2024 - DevSH Graphics Programming Sp. z O.O.
+// This file is part of the "Nabla Engine".
+// For conditions of distribution and use, see copyright notice in nabla.h
+#ifndef _NBL_BUILTIN_HLSL_UTILITY_INCLUDED_
+#define _NBL_BUILTIN_HLSL_UTILITY_INCLUDED_
+
+
+#include <nbl/builtin/hlsl/type_traits.hlsl>
+
+
+namespace nbl
+{
+namespace hlsl
+{
+
+template<typename T1, typename T2>
+struct pair
+{
+	using first_type = T1;
+	using second_type = T2;
+
+	first_type first;
+	second_type second;
+};
+
+template<typename T1, typename T2>
+pair<T1, T2> make_pair(T1 f, T2 s)
+{
+	pair<T1, T2> p;
+	p.first = f;
+	p.second = s;
+	return p;
+}
+
+template<typename T1, typename T2>
+void swap(NBL_REF_ARG(pair<T1, T2>) a, NBL_REF_ARG(pair<T1, T2>) b)
+{
+	T1 temp_first = a.first;
+	T2 temp_second = a.second;
+	a.first = b.first;
+	a.second = b.second;
+	b.first = temp_first;
+	b.second = temp_second;
+}
+
+template<typename T>
+const static bool always_true = true;
+#ifndef __HLSL_VERSION
+
+template<class T>
+std::add_rvalue_reference_t<T> declval() noexcept
+{
+	static_assert(false,"Actually calling declval is ill-formed.");
+}
+
+#else
+
+namespace experimental
+{
+
+template<class T>
+T declval() {}
+
+}
+
+#endif
+}
+}
+
+#endif