DenseLinAlgPack_OutFormat.hpp

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#ifndef LINALGPACK_OUT_FORMAT_H
#define LINALGPACK_OUT_FORMAT_H

#include "DenseLinAlgPack_IOFormat.hpp"

namespace DenseLinAlgPack {

/* * Output stream operator function for const_bound_format objects.
  *
  * This template function performs the following tasks.
  * \begin{enumeration}
  * <li> Saves the formating state of #os#
  * <li> Sets the formating state of #os# to that stored in #bf.f()#
  * <li> Calls #output(os, bf.obj(), bf.extra_flags().flags())#
  * <li> Resets the streams formating state to its original.
  * \end{enumeration}
  *
  * The original formating state of #os# is preserved even if an exception
  * is thrown. 
  */
template<class T>
std::ostream& operator<<(std::ostream& os, const LinAlgPackIO::const_bound_format<T>& bf)
{
  using LinAlgPackIO::ios_format_memento;
  ios_format_memento old_format = ios_format_memento::save_format(os);
  try {
    bf.f().set_format(os);
    output( os, bf.obj(), bf.f().extra_flags().flags() );
  }
  catch(...) {
    old_format.set_format(os);
    throw;
  }
  old_format.set_format(os);
  return os;
}

template<class T>
inline std::ostream& operator<<(std::ostream& os, const LinAlgPackIO::bound_format<T>& bf) {
  return operator<<( os, LinAlgPackIO::const_bound_format<T>( bf.f(), bf.obj() ) );
}

} // end namespace DenseLinAlgPack

#endif // LINALGPACK_OUT_FORMAT_H