valarray_after.h

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

// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
// 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// 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 <[e-mail]>

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

#ifndef _VALARRAY_AFTER_H
#define _VALARRAY_AFTER_H 1

#pragma GCC system_header

namespace std
{
  //
  // gslice_array closure.
  //
  template<class _Dom>
    class _GBase
    {
    public:
      typedef typename _Dom::value_type value_type;
      
      _GBase (const _Dom& __e, const valarray<size_t>& __i)
      : _M_expr (__e), _M_index(__i) {}
      
      value_type
      operator[] (size_t __i) const
      { return _M_expr[_M_index[__i]]; }
      
      size_t
      size () const
      { return _M_index.size(); }

    private:
      const _Dom&	      _M_expr;
      const valarray<size_t>& _M_index;
    };

  template<typename _Tp>
    class _GBase<_Array<_Tp> >
    {
    public:
      typedef _Tp value_type;
      
      _GBase (_Array<_Tp> __a, const valarray<size_t>& __i)
      : _M_array (__a), _M_index(__i) {}
      
      value_type
      operator[] (size_t __i) const
      { return _M_array._M_data[_M_index[__i]]; }
      
      size_t
      size () const
      { return _M_index.size(); }

    private:
      const _Array<_Tp>       _M_array;
      const valarray<size_t>& _M_index;
    };

  template<class _Dom>
    struct _GClos<_Expr, _Dom>
    : _GBase<_Dom>
    {
      typedef _GBase<_Dom> _Base;
      typedef typename _Base::value_type value_type;
      
      _GClos (const _Dom& __e, const valarray<size_t>& __i)
      : _Base (__e, __i) {}
    };

  template<typename _Tp>
    struct _GClos<_ValArray, _Tp>
    : _GBase<_Array<_Tp> >
    {
      typedef _GBase<_Array<_Tp> > _Base;
      typedef typename _Base::value_type value_type;
      
      _GClos (_Array<_Tp> __a, const valarray<size_t>& __i)
      : _Base (__a, __i) {}
    };

  //
  // indirect_array closure
  //
  template<class _Dom>
    class _IBase
    {
    public:
      typedef typename _Dom::value_type value_type;

      _IBase (const _Dom& __e, const valarray<size_t>& __i)
      : _M_expr (__e), _M_index (__i) {}
      
      value_type
      operator[] (size_t __i) const
      { return _M_expr[_M_index[__i]]; }
      
      size_t
      size() const
      { return _M_index.size(); }

    private:
      const _Dom&	      _M_expr;
      const valarray<size_t>& _M_index;
    };

  template<class _Dom>
    struct _IClos<_Expr, _Dom>
    : _IBase<_Dom>
    {
      typedef _IBase<_Dom> _Base;
      typedef typename _Base::value_type value_type;
      
      _IClos (const _Dom& __e, const valarray<size_t>& __i)
      : _Base (__e, __i) {}
    };

  template<typename _Tp>
    struct _IClos<_ValArray, _Tp>
    : _IBase<valarray<_Tp> >
    {
      typedef _IBase<valarray<_Tp> > _Base;
      typedef _Tp value_type;
      
      _IClos (const valarray<_Tp>& __a, const valarray<size_t>& __i)
      : _Base (__a, __i) {}
    };
  
  //
  // class _Expr
  //
  template<class _Clos, typename _Tp>
    class _Expr
    {
    public:
      typedef _Tp value_type;

      _Expr(const _Clos&);

      const _Clos& operator()() const;

      value_type operator[](size_t) const;
      valarray<value_type> operator[](slice) const;
      valarray<value_type> operator[](const gslice&) const;
      valarray<value_type> operator[](const valarray<bool>&) const;
      valarray<value_type> operator[](const valarray<size_t>&) const;

      _Expr<_UnClos<__unary_plus, std::_Expr, _Clos>, value_type>
      operator+() const;

      _Expr<_UnClos<__negate, std::_Expr, _Clos>, value_type>
      operator-() const;

      _Expr<_UnClos<__bitwise_not, std::_Expr, _Clos>, value_type>
      operator~() const;

      _Expr<_UnClos<__logical_not, std::_Expr, _Clos>, bool>
      operator!() const;

      size_t size() const;
      value_type sum() const;

      valarray<value_type> shift(int) const;
      valarray<value_type> cshift(int) const;

      value_type min() const;
      value_type max() const;

      valarray<value_type> apply(value_type (*)(const value_type&)) const;
      valarray<value_type> apply(value_type (*)(value_type)) const;

    private:
      const _Clos _M_closure;
    };

  template<class _Clos, typename _Tp>
    inline
    _Expr<_Clos, _Tp>::_Expr(const _Clos& __c) : _M_closure(__c) {}

  template<class _Clos, typename _Tp>
    inline const _Clos&
    _Expr<_Clos, _Tp>::operator()() const
    { return _M_closure; }

  template<class _Clos, typename _Tp>
    inline _Tp
    _Expr<_Clos, _Tp>::operator[](size_t __i) const
    { return _M_closure[__i]; }

  template<class _Clos, typename _Tp>
    inline valarray<_Tp>
    _Expr<_Clos, _Tp>::operator[](slice __s) const
    {
      valarray<_Tp> __v = valarray<_Tp>(*this)[__s];
      return __v;
    }

  template<class _Clos, typename _Tp>
    inline valarray<_Tp>
    _Expr<_Clos, _Tp>::operator[](const gslice& __gs) const
    {
      valarray<_Tp> __v = valarray<_Tp>(*this)[__gs];
      return __v;
    }

  template<class _Clos, typename _Tp>
    inline valarray<_Tp>
    _Expr<_Clos, _Tp>::operator[](const valarray<bool>& __m) const
    {
      valarray<_Tp> __v = valarray<_Tp>(*this)[__m];
      return __v;
    }

  template<class _Clos, typename _Tp>
    inline valarray<_Tp>
    _Expr<_Clos, _Tp>::operator[](const valarray<size_t>& __i) const
    {
      valarray<_Tp> __v = valarray<_Tp>(*this)[__i];
      return __v;
    }

  template<class _Clos, typename _Tp>
    inline size_t
    _Expr<_Clos, _Tp>::size() const
    { return _M_closure.size(); }

  template<class _Clos, typename _Tp>
    inline valarray<_Tp>
    _Expr<_Clos, _Tp>::shift(int __n) const
    {
      valarray<_Tp> __v = valarray<_Tp>(*this).shift(__n);
      return __v;
    }

  template<class _Clos, typename _Tp>
    inline valarray<_Tp>
    _Expr<_Clos, _Tp>::cshift(int __n) const
    {
      valarray<_Tp> __v = valarray<_Tp>(*this).cshift(__n);
      return __v;
    }

  template<class _Clos, typename _Tp>
    inline valarray<_Tp>
    _Expr<_Clos, _Tp>::apply(_Tp __f(const _Tp&)) const
    {
      valarray<_Tp> __v = valarray<_Tp>(*this).apply(__f);
      return __v;