namespace glm
{
	/// @addtogroup gtx_fast_square_root
	/// @{

	/// Faster than the common sqrt function but less accurate.
	///
	/// @see gtx_fast_square_root extension.
	template<typename genType>
	GLM_FUNC_DECL genType fastSqrt(genType x);

	/// Faster than the common sqrt function but less accurate.
	///
	/// @see gtx_fast_square_root extension.
	template<length_t L, typename T, qualifier Q>
	GLM_FUNC_DECL vec<L, T, Q> fastSqrt(vec<L, T, Q> const& x);

	/// Faster than the common inversesqrt function but less accurate.
	///
	/// @see gtx_fast_square_root extension.
	template<typename genType>
	GLM_FUNC_DECL genType fastInverseSqrt(genType x);

	/// Faster than the common inversesqrt function but less accurate.
	///
	/// @see gtx_fast_square_root extension.
	template<length_t L, typename T, qualifier Q>
	GLM_FUNC_DECL vec<L, T, Q> fastInverseSqrt(vec<L, T, Q> const& x);

	/// Faster than the common length function but less accurate.
	///
	/// @see gtx_fast_square_root extension.
	template<typename genType>
	GLM_FUNC_DECL genType fastLength(genType x);

	/// Faster than the common length function but less accurate.
	///
	/// @see gtx_fast_square_root extension.
	template<length_t L, typename T, qualifier Q>
	GLM_FUNC_DECL T fastLength(vec<L, T, Q> const& x);

	/// Faster than the common distance function but less accurate.
	///
	/// @see gtx_fast_square_root extension.
	template<typename genType>
	GLM_FUNC_DECL genType fastDistance(genType x, genType y);

	/// Faster than the common distance function but less accurate.
	///
	/// @see gtx_fast_square_root extension.
	template<length_t L, typename T, qualifier Q>
	GLM_FUNC_DECL T fastDistance(vec<L, T, Q> const& x, vec<L, T, Q> const& y);

	/// Faster than the common normalize function but less accurate.
	///
	/// @see gtx_fast_square_root extension.
	template<typename genType>
	GLM_FUNC_DECL genType fastNormalize(genType x);

	/// Faster than the common normalize function but less accurate.
	///
	/// @see gtx_fast_square_root extension.
	template<length_t L, typename T, qualifier Q>
	GLM_FUNC_DECL vec<L, T, Q> fastNormalize(vec<L, T, Q> const& x);

	/// @}
}// namespace glm

#include "fast_square_root.inl"
