Add generic swizzling function

libs/geom/include/psemek/geom/swizzle.hpp

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <cstddef>
+#include <type_traits>
+
+namespace psemek::geom
+{
+
+	namespace detail
+	{
+
+		template <typename T>
+		struct swizzle_rebind;
+
+		template <template <typename, std::size_t> typename C, typename T, std::size_t N>
+		struct swizzle_rebind<C<T, N>>
+		{
+			template <std::size_t M>
+			using type = C<T, M>;
+		};
+
+	}
+
+	template <std::size_t ... I>
+	constexpr auto swizzle = [](auto const & x){
+		using result = typename detail::swizzle_rebind<std::decay_t<decltype(x)>>::template type<sizeof...(I)>;
+		return result{(I == (-1) ? 0 : x[I])...};
+	};
+
+
+}