text: /// @ref gtx_hash
  /// @file glm/gtx/hash.hpp
  ///
  /// @see core (dependence)
  ///
  /// @defgroup gtx_hash GLM_GTX_hash
  /// @ingroup gtx
  /// 
  /// @brief Add std::hash support for glm types
  /// 
  /// <glm/gtx/hash.hpp> need to be included to use these functionalities.
  
  #pragma once
  
  #ifndef GLM_ENABLE_EXPERIMENTAL
  #	error "GLM: GLM_GTX_hash 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."
  #endif
  
  #include <functional>
  
  #include "../vec2.hpp"
  #include "../vec3.hpp"
  #include "../vec4.hpp"
  #include "../gtc/vec1.hpp"
  
  #include "../gtc/quaternion.hpp"
  #include "../gtx/dual_quaternion.hpp"
  
  #include "../mat2x2.hpp"
  #include "../mat2x3.hpp"
  #include "../mat2x4.hpp"
  
  #include "../mat3x2.hpp"
  #include "../mat3x3.hpp"
  #include "../mat3x4.hpp"
  
  #include "../mat4x2.hpp"
  #include "../mat4x3.hpp"
  #include "../mat4x4.hpp"
  
  #if !GLM_HAS_CXX11_STL
  #	error "GLM_GTX_hash requires C++11 standard library support"
  #endif
  
  namespace std
  {
  	template<typename T, glm::precision P>
  	struct hash<glm::vec<1, T,P> >
  	{
  		GLM_FUNC_DECL size_t operator()(glm::vec<1, T, P> const & v) const;
  	};
  
  	template<typename T, glm::precision P>
  	struct hash<glm::vec<2, T,P> >
  	{
  		GLM_FUNC_DECL size_t operator()(glm::vec<2, T, P> const & v) const;
  	};
  
  	template<typename T, glm::precision P>
  	struct hash<glm::vec<3, T,P> >
  	{
  		GLM_FUNC_DECL size_t operator()(glm::vec<3, T, P> const & v) const;
  	};
  
  	template<typename T, glm::precision P>
  	struct hash<glm::vec<4, T,P> >
  	{
  		GLM_FUNC_DECL size_t operator()(glm::vec<4, T, P> const & v) const;
  	};
  
  	template<typename T, glm::precision P>
  	struct hash<glm::tquat<T,P>>
  	{
  		GLM_FUNC_DECL size_t operator()(glm::tquat<T, P> const & q) const;
  	};
  
  	template<typename T, glm::precision P>
  	struct hash<glm::tdualquat<T,P> >
  	{
  		GLM_FUNC_DECL size_t operator()(glm::tdualquat<T,P> const & q) const;
  	};
  
  	template<typename T, glm::precision P>
  	struct hash<glm::mat<2, 2, T,P> >
  	{
  		GLM_FUNC_DECL size_t operator()(glm::mat<2, 2, T,P> const & m) const;
  	};
  
  	template<typename T, glm::precision P>
  	struct hash<glm::mat<2, 3, T,P> >
  	{
  		GLM_FUNC_DECL size_t operator()(glm::mat<2, 3, T,P> const & m) const;
  	};
  
  	template<typename T, glm::precision P>
  	struct hash<glm::mat<2, 4, T,P> >
  	{
  		GLM_FUNC_DECL size_t operator()(glm::mat<2, 4, T,P> const & m) const;
  	};
  
  	template<typename T, glm::precision P>
  	struct hash<glm::mat<3, 2, T,P> >
  	{
  		GLM_FUNC_DECL size_t operator()(glm::mat<3, 2, T,P> const & m) const;
  	};
  
  	template<typename T, glm::precision P>
  	struct hash<glm::mat<3, 3, T,P> >
  	{
  		GLM_FUNC_DECL size_t operator()(glm::mat<3, 3, T,P> const & m) const;
  	};
  
  	template<typename T, glm::precision P>
  	struct hash<glm::mat<3, 4, T,P> >
  	{
  		GLM_FUNC_DECL size_t operator()(glm::mat<3, 4, T,P> const & m) const;
  	};
  
  	template<typename T, glm::precision P>
  	struct hash<glm::mat<4, 2, T,P> >
  	{
  		GLM_FUNC_DECL size_t operator()(glm::mat<4, 2, T,P> const & m) const;
  	};
  	
  	template<typename T, glm::precision P>
  	struct hash<glm::mat<4, 3, T,P> >
  	{
  		GLM_FUNC_DECL size_t operator()(glm::mat<4, 3, T,P> const & m) const;
  	};
  
  	template<typename T, glm::precision P>
  	struct hash<glm::mat<4, 4, T,P> >
  	{
  		GLM_FUNC_DECL size_t operator()(glm::mat<4, 4, T,P> const & m) const;
  	};
  } // namespace std
  
  #include "hash.inl"
  