From c8920ea9977db77861de2efd753825a5acf04389 Mon Sep 17 00:00:00 2001
From: King_DuckZ <king_duckz@gmx.com>
Date: Fri, 28 Oct 2016 22:20:23 +0200
Subject: [PATCH] Implementation of vector_cast that works with vwr::Vec.

---
 src/vector.hpp | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/src/vector.hpp b/src/vector.hpp
index cb863f6..afbf000 100644
--- a/src/vector.hpp
+++ b/src/vector.hpp
@@ -6,6 +6,7 @@
 #if !defined(NDEBUG)
 #	include <iostream>
 #endif
+#include <utility>
 
 #define SPECIALIZE_ARRAY_VECTOR(TYPE, DIM) \
     template <> \
@@ -34,12 +35,33 @@ namespace vwr {
 		return parStream;
 	}
 #endif
+
+	namespace implem {
+		template <typename TO, typename FROM, std::size_t... I>
+		Vec<TO> vector_cast (const Vec<FROM>& parVec, Vec<TO>*, std::index_sequence<I...>) {
+			static_assert(
+				static_cast<int>(Vec<TO>::dimensions) == static_cast<int>(Vec<FROM>::dimensions),
+				"Mismatching dimensions"
+			);
+			static_assert(sizeof...(I) == Vec<TO>::dimensions, "Mismatching index count");
+			typedef typename Vec<TO>::scalar_type CastType;
+
+			return Vec<TO>(static_cast<CastType>(parVec[I])...);
+		}
+	} //namespace implem
+
+	template <typename TOVec, typename FROM>
+	TOVec vector_cast (const Vec<FROM>& parVec) {
+		TOVec* const to = nullptr;
+		return implem::vector_cast(parVec, to, std::make_index_sequence<Vec<FROM>::dimensions>());
+	}
 } //namespace vwr
 
 namespace curry {
 	using vec2f = vwr::Vec<std::array<float, 2>>;
 	using vec2us = vwr::Vec<std::array<uint16_t, 2>>;
 	using vec2i = vwr::Vec<std::array<int32_t, 2>>;
+	using vwr::vector_cast;
 } //namespace curry
 
 //make stuff from CloonelJump compile happily