arma_util.hpp

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#ifndef MLPACK_BINDINGS_PYTHON_CYTHON_ARMA_UTIL_HPP
#define MLPACK_BINDINGS_PYTHON_CYTHON_ARMA_UTIL_HPP

// Include Armadillo via mlpack.
#include <mlpack/core.hpp>

template<typename T>
void SetMemState(T& t, int state)
{
  const_cast<arma::uhword&>(t.mem_state) = state;
}

template<typename T>
size_t GetMemState(T& t)
{
  // Fake the memory state if we are using preallocated memory---since we will
  // end up copying that memory, NumPy can own it.
  if (t.mem && t.n_elem <= arma::arma_config::mat_prealloc)
    return 0;

  return (size_t) t.mem_state;
}

template<typename T>
inline typename T::elem_type* GetMemory(T& m)
{
  if (m.mem && m.n_elem <= arma::arma_config::mat_prealloc)
  {
    // We need to allocate new memory.
    typename T::elem_type* mem =
        arma::memory::acquire<typename T::elem_type>(m.n_elem);
    arma::arrayops::copy(mem, m.memptr(), m.n_elem);
    return mem;
  }
  else
  {
    return m.memptr();
  }
}

#endif