Implement a get_ram_overhead() utility function

#ifndef INCLUDE_UTILS_H_

#define INCLUDE_UTILS_H_

/*! \brief Obtain an estimate of the RAM overhead factor for optimization.

 *

 * Code speed-up optimization usually comes at the cost of increased memory

 * requirements. While this should not generally be a serious issue, it can

 * become such in case of models that require large amounts of memory to be

 * handled. This function tests the code build configuration to provide an

 * zero-order estimate of the weight of these overheads to protect the host

 * system from saturating the RAM.

 *

 * \return factor: `double` The multiplicative factor to be applied to data size.

 */

double get_ram_overhead();

/*! \brief Write a double complex matrix to a text file.

 *

 * \param af: `VirtualAsciiFile *` Pointer to an existing VirtualAsciiFile.

using namespace std;

double get_ram_overhead() {

  double result = 1.0;

#ifdef USE_MAGMA

  if (result < 15.0) result = 15.0;

#endif //USE_MAGMA

#ifdef USE_LAPACK

  if (result < 2.0) result = 2.0;

#endif //USE_MAGMA

  return result;

}

int write_dcomplex_matrix(

  VirtualAsciiFile *af, dcomplex **mat, int rows, int columns,

  const std::string& format, int first_index