MatrixConvert.h

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// GMTL is (C) Copyright 2001-2010 by Allen Bierbaum
// Distributed under the GNU Lesser General Public License 2.1 with an
// addendum covering inlined code. (See accompanying files LICENSE and
// LICENSE.addendum or http://www.gnu.org/copyleft/lesser.txt)

#ifndef _GMTL_MATRIX_CONVERT_H_
#define _GMTL_MATRIX_CONVERT_H_

#include <boost/mpl/for_each.hpp>
#include <boost/mpl/range_c.hpp>
#include <boost/lambda/lambda.hpp>
#include <gmtl/Matrix.h>


namespace gmtl
{

template<typename DATA_TYPE_OUT, typename DATA_TYPE_IN, unsigned ROWS, unsigned COLS>
inline gmtl::Matrix<DATA_TYPE_OUT, ROWS, COLS>
convertTo(const gmtl::Matrix<DATA_TYPE_IN, ROWS, COLS>& in)
{
   using namespace boost::lambda;

   gmtl::Matrix<DATA_TYPE_OUT, ROWS, COLS> out;

   // Accessing in.mData and out.mData in this way allows for use of
   // Boost.Lambda so that a separate helper function is not required to do
   // the assignment.
   const DATA_TYPE_IN* in_data(in.mData);
   DATA_TYPE_OUT* out_data(out.mData);

   // This relies on implicit casting between data types.
   boost::mpl::for_each< boost::mpl::range_c<unsigned int, 0, ROWS * COLS> >(
      *(out_data + boost::lambda::_1) = *(in_data + boost::lambda::_1)
   );

   return out;
}

}


#endif /* _GMTL_MATRIX_CONVERT_H_ */