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DenseLinAlgPack_OutFormat.hpp
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00041 
00042 #ifndef LINALGPACK_OUT_FORMAT_H
00043 #define LINALGPACK_OUT_FORMAT_H
00044 
00045 #include "DenseLinAlgPack_IOFormat.hpp"
00046 
00047 namespace DenseLinAlgPack {
00048 
00050 /* * Output stream operator function for const_bound_format objects.
00051   *
00052   * This template function performs the following tasks.
00053   * \begin{enumeration}
00054   * <li> Saves the formating state of #os#
00055   * <li> Sets the formating state of #os# to that stored in #bf.f()#
00056   * <li> Calls #output(os, bf.obj(), bf.extra_flags().flags())#
00057   * <li> Resets the streams formating state to its original.
00058   * \end{enumeration}
00059   *
00060   * The original formating state of #os# is preserved even if an exception
00061   * is thrown. 
00062   */
00063 template<class T>
00064 std::ostream& operator<<(std::ostream& os, const LinAlgPackIO::const_bound_format<T>& bf)
00065 {
00066   using LinAlgPackIO::ios_format_memento;
00067   ios_format_memento old_format = ios_format_memento::save_format(os);
00068   try {
00069     bf.f().set_format(os);
00070     output( os, bf.obj(), bf.f().extra_flags().flags() );
00071   }
00072   catch(...) {
00073     old_format.set_format(os);
00074     throw;
00075   }
00076   old_format.set_format(os);
00077   return os;
00078 }
00079 
00081 template<class T>
00082 inline std::ostream& operator<<(std::ostream& os, const LinAlgPackIO::bound_format<T>& bf) {
00083   return operator<<( os, LinAlgPackIO::const_bound_format<T>( bf.f(), bf.obj() ) );
00084 }
00085 
00086 } // end namespace DenseLinAlgPack
00087 
00088 #endif // LINALGPACK_OUT_FORMAT_H
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