// -*- C++ -*-/*************************************************************************** * blitz/array/multi.h  Support for multicomponent arrays * * Copyright (C) 1997-2001 Todd Veldhuizen <tveldhui@oonumerics.org> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * Suggestions:          blitz-dev@oonumerics.org * Bugs:                 blitz-bugs@oonumerics.org * * For more information, please see the Blitz++ Home Page: *    http://oonumerics.org/blitz/ * ****************************************************************************/#ifndef BZ_ARRAYMULTI_H#define BZ_ARRAYMULTI_H#ifndef BZ_ARRAY_H #error <blitz/array/multi.h> must be included via <blitz/array.h>#endifBZ_NAMESPACE(blitz)/* * The multicomponent_traits class provides a mapping from multicomponent * tuples to the element type they contain.  For example: * * multicomponent_traits<complex<float> >::T_numtype is float, * multicomponent_traits<TinyVector<int,3> >::T_numtype is int. * * This is used to support Array<T,N>::operator[], which extracts components * from a multicomponent array. */// By default, produce a harmless component type, and zero components.template<typename T_component>struct multicomponent_traits {    typedef T_component T_element;    static const int numComponents = 0;};// TinyVectortemplate<typename T_numtype, int N_rank>struct multicomponent_traits<TinyVector<T_numtype,N_rank> > {    typedef T_numtype T_element;    static const int numComponents = N_rank;};#ifdef BZ_HAVE_COMPLEX// complex<T>template<typename T>struct multicomponent_traits<complex<T> > {    typedef T T_element;    static const int numComponents = 2;};#endif// This macro is provided so that users can register their own// multicomponent types.#define BZ_DECLARE_MULTICOMPONENT_TYPE(T_tuple,T,N)          \  BZ_NAMESPACE(blitz)                                        \  template<>                                                 \  struct multicomponent_traits<T_tuple > {                   \    typedef T T_element;                                     \    static const int numComponents = N;                      \  };                                                         \  BZ_NAMESPACE_ENDBZ_NAMESPACE_END#endif // BZ_ARRAYMULTI_H