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

// Copyright (C) 1997-1999, 2000 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>

#ifndef _CPP_BITS_SLICE_ARRAY_H
#define _CPP_BITS_SLICE_ARRAY_H 1

namespace std {
    
    template<typename _Tp>
    class slice_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 &);
        //        ~slice_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:
        friend class valarray<_Tp>;
        slice_array(_Array<_Tp>, const slice&);
        
        const size_t     _M_sz;
        const size_t     _M_stride;
        const _Array<_Tp> _M_array;
        
        // this constructor is implemented since we need to return a value.
        slice_array (const slice_array&);

        // not implemented
        slice_array ();
        slice_array& operator= (const slice_array&);
    };

    template<typename _Tp>
    inline slice_array<_Tp>::slice_array (_Array<_Tp> __a, const slice& __s)
            : _M_sz (__s.size ()), _M_stride (__s.stride ()),
              _M_array (__a.begin () + __s.start ()) {}

    
    template<typename _Tp>
    inline slice_array<_Tp>::slice_array(const slice_array<_Tp>& a)
            : _M_sz(a._M_sz), _M_stride(a._M_stride), _M_array(a._M_array) {}
    
    //    template<typename _Tp>
    //    inline slice_array<_Tp>::~slice_array () {}

    template<typename _Tp>
    inline void
    slice_array<_Tp>::operator= (const _Tp& __t) 
    { __valarray_fill (_M_array, _M_sz, _M_stride, __t); }
    
    template<typename _Tp>
    inline void
    slice_array<_Tp>::operator= (const valarray<_Tp>& __v) const
    { __valarray_copy (_Array<_Tp> (__v), _M_array, _M_sz, _M_stride); }
    
    template<typename _Tp>
    template<class _Dom>
    inline void
    slice_array<_Tp>::operator= (const _Expr<_Dom,_Tp>& __e) const
    { __valarray_copy (__e, _M_sz, _M_array, _M_stride); }

#undef _DEFINE_VALARRAY_OPERATOR
#define _DEFINE_VALARRAY_OPERATOR(op, name)				\
template<typename _Tp>							\
inline void								\
slice_array<_Tp>::operator op##= (const valarray<_Tp>& __v) const	\
{									\
  _Array_augmented_##name (_M_array, _M_sz, _M_stride, _Array<_Tp> (__v));\
}									\
									\
template<typename _Tp> template<class _Dom>				\
inline void								\
slice_array<_Tp>::operator op##= (const _Expr<_Dom,_Tp>& __e) const	\
{									\
    _Array_augmented_##name (_M_array, _M_stride, __e, _M_sz);		\
}
        

_DEFINE_VALARRAY_OPERATOR(*, multiplies)
_DEFINE_VALARRAY_OPERATOR(/, divides)
_DEFINE_VALARRAY_OPERATOR(%, modulus)
_DEFINE_VALARRAY_OPERATOR(+, plus)
_DEFINE_VALARRAY_OPERATOR(-, minus)
_DEFINE_VALARRAY_OPERATOR(^, xor)
_DEFINE_VALARRAY_OPERATOR(&, and)
_DEFINE_VALARRAY_OPERATOR(|, or)
_DEFINE_VALARRAY_OPERATOR(<<, shift_left)
_DEFINE_VALARRAY_OPERATOR(>>, shift_right)

#undef _DEFINE_VALARRAY_OPERATOR

} // std::

#endif /* _CPP_BITS_SLICE_ARRAY_H */

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