make_alias.hpp

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#ifndef MLPACK_CORE_MATH_MAKE_ALIAS_HPP
#define MLPACK_CORE_MATH_MAKE_ALIAS_HPP

namespace mlpack {
namespace math {

template<typename ElemType>
arma::Mat<ElemType> MakeAlias(arma::Mat<ElemType>& input,
                              const bool strict = true)
{
  // Use the advanced constructor.
  return arma::Mat<ElemType>(input.memptr(), input.n_rows, input.n_cols, false,
      strict);
}

template<typename ElemType>
arma::Row<ElemType> MakeAlias(arma::Row<ElemType>& input,
                              const bool strict = true)
{
  // Use the advanced constructor.
  return arma::Row<ElemType>(input.memptr(), input.n_elem, false, strict);
}

template<typename ElemType>
arma::Col<ElemType> MakeAlias(arma::Col<ElemType>& input,
                              const bool strict = true)
{
  // Use the advanced constructor.
  return arma::Col<ElemType>(input.memptr(), input.n_elem, false, strict);
}

template<typename ElemType>
arma::SpMat<ElemType> MakeAlias(const arma::SpMat<ElemType>& input,
                                const bool /* strict */ = true)
{
  // Make a copy...
  return arma::SpMat<ElemType>(input);
}

template<typename ElemType>
arma::SpRow<ElemType> MakeAlias(const arma::SpRow<ElemType>& input,
                                const bool /* strict */ = true)
{
  // Make a copy...
  return arma::SpRow<ElemType>(input);
}

template<typename ElemType>
arma::SpCol<ElemType> MakeAlias(const arma::SpCol<ElemType>& input,
                                const bool /* strict */ = true)
{
  // Make a copy...
  return arma::SpCol<ElemType>(input);
}

template<typename ElemType>
void ClearAlias(arma::Mat<ElemType>& mat)
{
  if (mat.mem_state >= 1)
    mat.reset();
}

template<typename ElemType>
void ClearAlias(arma::SpMat<ElemType>& /* mat */)
{
  // Nothing to do.
}


} // namespace math
} // namespace mlpack

#endif