More constexpr test

glm/detail/type_mat3x3.hpp

@@ -30,7 +30,7 @@ namespace glm
 		GLM_FUNC_DECL static GLM_CONSTEXPR_CXX11 length_type length() { return 3; }
 
 		GLM_FUNC_DECL col_type & operator[](length_type i);
-		GLM_FUNC_DECL col_type const& operator[](length_type i) const;
+		GLM_FUNC_DECL GLM_CONSTEXPR_CXX11 col_type const& operator[](length_type i) const;
 
 		// -- Constructors --
 
@@ -175,7 +175,7 @@ namespace glm
 	// -- Boolean operators --
 
 	template<typename T, qualifier Q>
-	GLM_FUNC_DECL bool operator==(mat<3, 3, T, Q> const& m1, mat<3, 3, T, Q> const& m2);
+	GLM_FUNC_DECL GLM_CONSTEXPR_CXX11 bool operator==(mat<3, 3, T, Q> const& m1, mat<3, 3, T, Q> const& m2);
 
 	template<typename T, qualifier Q>
 	GLM_FUNC_DECL bool operator!=(mat<3, 3, T, Q> const& m1, mat<3, 3, T, Q> const& m2);

glm/detail/type_mat3x3.inl

@@ -248,7 +248,7 @@ namespace glm
 	}
 
 	template<typename T, qualifier Q>
-	GLM_FUNC_QUALIFIER typename mat<3, 3, T, Q>::col_type const& mat<3, 3, T, Q>::operator[](typename mat<3, 3, T, Q>::length_type i) const
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR_CXX11 typename mat<3, 3, T, Q>::col_type const& mat<3, 3, T, Q>::operator[](typename mat<3, 3, T, Q>::length_type i) const
 	{
 		assert(i < this->length());
 		return this->value[i];
@@ -591,7 +591,7 @@ namespace glm
 	// -- Boolean operators --
 
 	template<typename T, qualifier Q>
-	GLM_FUNC_QUALIFIER bool operator==(mat<3, 3, T, Q> const& m1, mat<3, 3, T, Q> const& m2)
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR_CXX11 bool operator==(mat<3, 3, T, Q> const& m1, mat<3, 3, T, Q> const& m2)
 	{
 		return (m1[0] == m2[0]) && (m1[1] == m2[1]) && (m1[2] == m2[2]);
 	}

test/core/core_type_mat3x3.cpp

@@ -187,6 +187,10 @@ static int test_constexpr()
 {
 #if GLM_HAS_CONSTEXPR_CXX11
 	static_assert(glm::mat3x3::length() == 3, "GLM: Failed constexpr");
+
+	GLM_CONSTEXPR_CXX11 glm::mat3x3 const Z(0.0f);
+	static_assert(Z[0] == glm::vec3(0.0f), "GLM: Failed constexpr");
+	static_assert(Z == glm::mat3x3(0.0f), "GLM: Failed constexpr");
 #endif
 
 	return 0;