mask_array.h

// The template and inlines for the -*- C++ -*- mask_array class.

// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002
//  Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library 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, or (at your option)
// any later version.

// This library 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.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

// Written by Gabriel Dos Reis <Gabriel.Dos-Reis@DPTMaths.ENS-Cachan.Fr>

/** @file mask_array.h
 *  This is an internal header file, included by other library headers.
 *  You should not attempt to use it directly.
 */

#ifndef _MASK_ARRAY_H
#define _MASK_ARRAY_H 1

#pragma GCC system_header

namespace std {

  template <class _Tp> 
    class mask_array
    { 
    public:
      typedef _Tp value_type;
    
      void operator=(const valarray<_Tp>&) const;
      void operator*=(const valarray<_Tp>&) const;
      void operator/=(const valarray<_Tp>&) const;
      void operator%=(const valarray<_Tp>&) const;
      void operator+=(const valarray<_Tp>&) const; 
      void operator-=(const valarray<_Tp>&) const;
      void operator^=(const valarray<_Tp>&) const;  
      void operator&=(const valarray<_Tp>&) const;
      void operator|=(const valarray<_Tp>&) const;
      void operator<<=(const valarray<_Tp>&) const;  
      void operator>>=(const valarray<_Tp>&) const; 
      void operator=(const _Tp&) const;
    
        //        ~mask_array ();
        
      template<class _Dom>
        void operator=(const _Expr<_Dom,_Tp>&) const;
      template<class _Dom>
        void operator*=(const _Expr<_Dom,_Tp>&) const;
      template<class _Dom>
        void operator/=(const _Expr<_Dom,_Tp>&) const;
      template<class _Dom>
        void operator%=(const _Expr<_Dom,_Tp>&) const;
      template<class _Dom>
        void operator+=(const _Expr<_Dom,_Tp>&) const;
      template<class _Dom>
        void operator-=(const _Expr<_Dom,_Tp>&) const;
      template<class _Dom>
        void operator^=(const _Expr<_Dom,_Tp>&) const;
      template<class _Dom>
        void operator&=(const _Expr<_Dom,_Tp>&) const;
      template<class _Dom>
        void operator|=(const _Expr<_Dom,_Tp>&) const;
      template<class _Dom>
        void operator<<=(const _Expr<_Dom,_Tp>&) const;
      template<class _Dom>
        void operator>>=(const _Expr<_Dom,_Tp>&) const; 

    private:
      mask_array(_Array<_Tp>, size_t, _Array<bool>);
      friend class valarray<_Tp>;
        
      const size_t       _M_sz;
      const _Array<bool> _M_mask;
      const _Array<_Tp>   _M_array;
      
      mask_array (const mask_array&);
      
      // not implemented
      mask_array();
      mask_array& operator=(const mask_array&);
    };


  template<typename _Tp>
    inline mask_array<_Tp>::mask_array(const mask_array<_Tp>& a)
      : _M_sz(a._M_sz), _M_mask(a._M_mask), _M_array(a._M_array) {}

  template<typename _Tp>
    inline 
    mask_array<_Tp>::mask_array(_Array<_Tp> __a, size_t __s, _Array<bool> __m)
      : _M_sz(__s), _M_mask(__m), _M_array(__a) {}
    
  template<typename _Tp>
    inline void
    mask_array<_Tp>::operator=(const _Tp& __t) const
    { std::__valarray_fill(_M_array, _M_sz, _M_mask, __t); }
    
  template<typename _Tp>
    inline void
    mask_array<_Tp>::operator=(const valarray<_Tp>& __v) const
    { std::__valarray_copy(_Array<_Tp>(__v), __v.size(), _M_array, _M_mask); }

  template<typename _Tp>
    template<class _Ex>
      inline void
      mask_array<_Tp>::operator=(const _Expr<_Ex, _Tp>& __e) const
      { std::__valarray_copy(__e, __e.size(), _M_array, _M_mask); }

#undef _DEFINE_VALARRAY_OPERATOR
#define _DEFINE_VALARRAY_OPERATOR(_Op, _Name)				\
  template<typename _Tp>						\
    inline void								\
    mask_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const	\
    {									\
      _Array_augmented_##_Name(_M_array, _M_mask,			\
			       _Array<_Tp>(__v), __v.size());		\
    }									\
									\
  template<typename _Tp>                                                \
    template<class _Dom>			                        \
      inline void							\
      mask_array<_Tp>::operator _Op##=(const _Expr<_Dom, _Tp>& __e) const\
      {									\
	_Array_augmented_##_Name(_M_array, _M_mask, __e, __e.size());   \
      }

_DEFINE_VALARRAY_OPERATOR(*, __multiplies)
_DEFINE_VALARRAY_OPERATOR(/, __divides)
_DEFINE_VALARRAY_OPERATOR(%, __modulus)
_DEFINE_VALARRAY_OPERATOR(+, __plus)
_DEFINE_VALARRAY_OPERATOR(-, __minus)
_DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor)
_DEFINE_VALARRAY_OPERATOR(&, __bitwise_and)
_DEFINE_VALARRAY_OPERATOR(|, __bitwise_or)
_DEFINE_VALARRAY_OPERATOR(<<, __shift_left)
_DEFINE_VALARRAY_OPERATOR(>>, __shift_right)

#undef _DEFINE_VALARRAY_OPERATOR    
    
} // std::

#endif /* _MASK_ARRAY_H */

// Local Variables:
// mode:c++
// End: