Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

QVM: Quaternions, Vectors, Matrices

identity_mat

#include <boost/qvm/mat_operations.hpp>

namespace boost
{
    namespace qvm
    {
        template <class S,int D>
        -unspecified-return-type- identity_mat();
    }
}

Returns:

An identity matrix of size DxD and scalar type S.