Add C++17 structureed binding support

Add C++17 Structured Bindings support for vec,mat,quat types

glm/gtx/structured_bindings.hpp

@@ -0,0 +1,92 @@
+/// @ref gtx_structured_bindings
+/// @file glm/gtx/structured_bindings.hpp
+///
+/// @defgroup gtx_structured_bindings GLM_GTX_structured_bindings
+/// @ingroup gtx
+///
+/// Include <glm/gtx/structured_bindings.hpp> to use the features of this extension.
+
+#pragma once
+
+// Dependency:
+#include "../glm.hpp"
+#include "../gtx/quaternion.hpp"
+
+#ifdef __cpp_structured_bindings
+#if __cpp_structured_bindings >= 201606L
+#include <utility>
+#include <cstddef>
+namespace std {
+	template<glm::length_t L,typename T,glm::qualifier Q>
+	struct tuple_size<glm::vec<L, T, Q>> {
+		static constexpr size_t value = L;
+	};
+	template<glm::length_t C,glm::length_t R, typename T, glm::qualifier Q>
+	struct tuple_size<glm::mat<C,R, T, Q>> {
+		static constexpr size_t value = C;
+	};
+	template<typename T, glm::qualifier Q>
+	struct tuple_size<glm::qua<T, Q>> {
+		static constexpr size_t value = 4;
+	};
+	template<std::size_t I,glm::length_t L,typename T,glm::qualifier Q>
+	struct tuple_element<I, glm::vec<L,T,Q>>
+	{
+		GLM_STATIC_ASSERT(I < L,"Index out of bounds");
+		typedef T type;
+	};
+	template<std::size_t I, glm::length_t C, glm::length_t R, typename T, glm::qualifier Q>
+	struct tuple_element<I, glm::mat<C,R, T, Q>>
+	{
+		GLM_STATIC_ASSERT(I < C, "Index out of bounds");
+		typedef glm::vec<R,T,Q> type;
+	};
+	template<std::size_t I, typename T, glm::qualifier Q>
+	struct tuple_element<I, glm::qua<T, Q>>
+	{
+		GLM_STATIC_ASSERT(I < 4, "Index out of bounds");
+		typedef T type;
+	};
+
+}
+#endif
+#endif
+
+#ifndef GLM_ENABLE_EXPERIMENTAL
+#	error "GLM: GLM_GTX_iteration is an experimental extension and may change in the future. Use #define GLM_ENABLE_EXPERIMENTAL before including it, if you really want to use it."
+#elif GLM_MESSAGES == GLM_ENABLE && !defined(GLM_EXT_INCLUDED)
+#	pragma message("GLM: GLM_GTX_io extension included")
+#endif
+
+namespace glm
+{
+	/// @addtogroup gtx_structured_bindings
+	/// @{
+
+	template<length_t I, length_t L, typename T, qualifier Q>
+	GLM_FUNC_DECL GLM_CONSTEXPR T& get(vec<L, T, Q>& v);
+	template<length_t I, length_t L, typename T, qualifier Q>
+	GLM_FUNC_DECL GLM_CONSTEXPR T const& get(vec<L, T, Q> const& v);
+
+	template<length_t I, length_t C, length_t R, typename T, qualifier Q>
+	GLM_FUNC_DECL GLM_CONSTEXPR vec<R, T, Q>& get(mat<C, R, T, Q>& m);
+	template<length_t I, length_t C, length_t R, typename T, qualifier Q>
+	GLM_FUNC_DECL GLM_CONSTEXPR vec<R, T, Q> const& get(mat<C, R, T, Q> const& m);
+
+	template<length_t I, typename T, qualifier Q>
+	GLM_FUNC_DECL GLM_CONSTEXPR T& get(qua<T, Q>& q);
+	template<length_t I, typename T, qualifier Q>
+	GLM_FUNC_DECL GLM_CONSTEXPR T const& get(qua<T, Q> const& q);
+
+#if GLM_HAS_RVALUE_REFERENCES
+	template<length_t I, length_t L,typename T, qualifier Q>
+	GLM_FUNC_DECL GLM_CONSTEXPR T get(vec<L,T, Q> const&& v);
+	template<length_t I,length_t C,length_t R, typename T, qualifier Q>
+	GLM_FUNC_DECL GLM_CONSTEXPR vec<R,T,Q> get(mat<C,R,T, Q> const&& m);
+	template<length_t I, typename T, qualifier Q>
+	GLM_FUNC_DECL GLM_CONSTEXPR T get(qua<T, Q> const&& q);
+#endif
+	/// @}
+}//namespace glm
+
+#include "structured_bindings.inl"

glm/gtx/structured_bindings.inl

@@ -0,0 +1,55 @@
+namespace glm
+{
+	template<length_t I, length_t L, typename T, qualifier Q>
+	GLM_CONSTEXPR T& get(vec<L, T, Q>& v) {
+		GLM_STATIC_ASSERT(I < L, "Index out of bounds");
+		return v[I];
+	}
+	template<length_t I, length_t L, typename T, qualifier Q>
+	GLM_CONSTEXPR T const& get(vec<L, T, Q> const& v) {
+		GLM_STATIC_ASSERT(I < L, "Index out of bounds");
+		return v[I];
+	}
+
+	template<length_t I, length_t C, length_t R, typename T, qualifier Q>
+	GLM_CONSTEXPR vec<R, T, Q>& get(mat<C, R, T, Q>& m) {
+		GLM_STATIC_ASSERT(I < C, "Index out of bounds");
+		return m[I];
+	}
+	template<length_t I, length_t C, length_t R, typename T, qualifier Q>
+	GLM_CONSTEXPR vec<R, T, Q> const& get(mat<C, R, T, Q> const& m) {
+		GLM_STATIC_ASSERT(I < C, "Index out of bounds");
+		return m[I];
+	}
+
+	template<length_t I, typename T, qualifier Q>
+	GLM_CONSTEXPR T& get(qua<T, Q>& q) {
+		GLM_STATIC_ASSERT(I < 4, "Index out of bounds");
+		return q[I];
+	}
+	template<length_t I, typename T, qualifier Q>
+	GLM_CONSTEXPR T const& get(qua<T, Q> const& q) {
+		GLM_STATIC_ASSERT(I < 4, "Index out of bounds");
+		return q[I];
+	}
+
+#if GLM_HAS_RVALUE_REFERENCES
+	template<length_t I, length_t L, typename T, qualifier Q>
+	GLM_CONSTEXPR T get(vec<L, T, Q> const&& v)
+	{
+		GLM_STATIC_ASSERT(I < L, "Index out of bounds");
+		return v[I];
+	}
+	template<length_t I, length_t C, length_t R, typename T, qualifier Q>
+	GLM_CONSTEXPR vec<R, T, Q> get(mat<C, R, T, Q> const&& m) {
+		GLM_STATIC_ASSERT(I < C, "Index out of bounds");
+		return m[I];
+	}
+	template<length_t I, typename T, qualifier Q>
+	GLM_CONSTEXPR T get(qua<T, Q> const&& q) {
+		GLM_STATIC_ASSERT(I < 4, "Index out of bounds");
+		return q[I];
+	}
+#endif
+}//namespace glm
+

test/gtx/CMakeLists.txt

@@ -50,6 +50,7 @@ glmCreateTestGTC(gtx_scalar_multiplication)
 glmCreateTestGTC(gtx_scalar_relational)
 glmCreateTestGTC(gtx_spline)
 glmCreateTestGTC(gtx_string_cast)
+glmCreateTestGTC(gtx_structured_bindings)
 glmCreateTestGTC(gtx_texture)
 glmCreateTestGTC(gtx_type_aligned)
 glmCreateTestGTC(gtx_type_trait)