0.9.5/api/a00147_source.html

 #ifndef GLM_GTX_vector_query

 #define GLM_GTX_vector_query


 // Dependency:

 #include "../glm.hpp"

 #include <cfloat>

 #include <limits>


 #if(defined(GLM_MESSAGES) && !defined(GLM_EXT_INCLUDED))

 #       pragma message("GLM: GLM_GTX_vector_query extension included")

 #endif


 namespace glm

 {


         template <typename T, precision P, template <typename, precision> class vecType>

         bool areCollinear(vecType<T, P> const & v0, vecType<T, P> const & v1, T const & epsilon);


         template <typename T, precision P, template <typename, precision> class vecType>

         bool areOrthogonal(vecType<T, P> const & v0, vecType<T, P> const & v1, T const & epsilon);


         template <typename T, precision P, template <typename, precision> class vecType>

         bool isNormalized(vecType<T, P> const & v, T const & epsilon);


         template <typename T, precision P, template <typename, precision> class vecType>

         bool isNull(vecType<T, P> const & v, T const & epsilon);


         template <typename T, precision P, template <typename, precision> class vecType>

         vecType<bool, P> isCompNull(vecType<T, P> const & v, T const & epsilon);


         template <typename T, precision P, template <typename, precision> class vecType>

         bool areOrthonormal(vecType<T, P> const & v0, vecType<T, P> const & v1, T const & epsilon);


 }// namespace glm


 #include "vector_query.inl"


 #endif//GLM_GTX_vector_query

glm::epsilon
GLM_FUNC_DECL genType epsilon()
Return the epsilon constant for floating point types.

glm::areOrthonormal
bool areOrthonormal(vecType< T, P > const &v0, vecType< T, P > const &v1, T const &epsilon)
Check whether two vectors are orthonormal.

glm::areOrthogonal
bool areOrthogonal(vecType< T, P > const &v0, vecType< T, P > const &v1, T const &epsilon)
Check whether two vectors are orthogonals.

glm::areCollinear
bool areCollinear(vecType< T, P > const &v0, vecType< T, P > const &v1, T const &epsilon)
Check whether two vectors are collinears.

glm::isNormalized
bool isNormalized(detail::tmat2x2< T, P > const &m, T const &epsilon)
Return whether a matrix is a normalized matrix.

glm::isNull
bool isNull(detail::tmat2x2< T, P > const &m, T const &epsilon)
Return whether a matrix a null matrix.

glm::isCompNull
vecType< bool, P > isCompNull(vecType< T, P > const &v, T const &epsilon)
Check whether a each component of a vector is null.