std_valarray.h

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

// Copyright (C) 1997-1999 Cygnus Solutions
//
// 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 <[e-mail]>

#ifndef _CPP_VALARRAY
#define _CPP_VALARRAY 1

#include <bits/c++config.h>
#include <bits/std_cstddef.h>
#include <bits/std_cmath.h>
#include <bits/std_cstdlib.h>
#include <bits/std_numeric.h>
#include <bits/std_functional.h>
#include <bits/std_algorithm.h>

namespace std {

    template<class _Clos, typename _Tp> class _Expr;

    template<typename _Tp1, typename _Tp2> class _ValArray;    

    template<template<class> class _Oper,
        template<class, class> class _Meta, class _Dom> struct _UnClos;

    template<template<class> class _Oper,
        template<class, class> class _Meta1,
        template<class, class> class _Meta2,
        class _Dom1, class _Dom2> class _BinClos;

    template<template<class, class> class _Meta, class _Dom> class _SClos;

    template<template<class, class> class _Meta, class _Dom> class _GClos;
    
    template<template<class, class> class _Meta, class _Dom> class _IClos;
    
    template<template<class, class> class _Meta, class _Dom> class _ValFunClos;

    template<template<class, class> class _Meta, class _Dom> class _RefFunClos;

    template<class _Tp> struct _Unary_plus;
    template<class _Tp> struct _Bitwise_and;
    template<class _Tp> struct _Bitwise_or;
    template<class _Tp> struct _Bitwise_xor;  
    template<class _Tp> struct _Bitwise_not;
    template<class _Tp> struct _Shift_left;
    template<class _Tp> struct _Shift_right;
  
    template<class _Tp> class valarray;   // An array of type _Tp
    class slice;                          // BLAS-like slice out of an array
    template<class _Tp> class slice_array;
    class gslice;                         // generalized slice out of an array
    template<class _Tp> class gslice_array;
    template<class _Tp> class mask_array;     // masked array
    template<class _Tp> class indirect_array; // indirected array

}

#include <bits/valarray_array.h>
#include <bits/valarray_meta.h>
  
namespace std {

  template<class _Tp> class valarray
  {
  public:
      typedef _Tp value_type;

      // _lib.valarray.cons_ construct/destroy:
      valarray();
      explicit valarray(size_t);
      valarray(const _Tp&, size_t);
      valarray(const _Tp* __restrict__, size_t);
      valarray(const valarray&);
      valarray(const slice_array<_Tp>&);
      valarray(const gslice_array<_Tp>&);
      valarray(const mask_array<_Tp>&);
      valarray(const indirect_array<_Tp>&);
      template<class _Dom>
      valarray(const _Expr<_Dom,_Tp>& __e);
     ~valarray();

      // _lib.valarray.assign_ assignment:
      valarray<_Tp>& operator=(const valarray<_Tp>&);
      valarray<_Tp>& operator=(const _Tp&);
      valarray<_Tp>& operator=(const slice_array<_Tp>&);
      valarray<_Tp>& operator=(const gslice_array<_Tp>&);
      valarray<_Tp>& operator=(const mask_array<_Tp>&);
      valarray<_Tp>& operator=(const indirect_array<_Tp>&);

      template<class _Dom> valarray<_Tp>&
      	operator= (const _Expr<_Dom,_Tp>&);

      // _lib.valarray.access_ element access:
      _Tp                 operator[](size_t) const;
      _Tp&                operator[](size_t);		
      // _lib.valarray.sub_ subset operations:
      _Expr<_SClos<_ValArray,_Tp>, _Tp> operator[](slice) const;
      slice_array<_Tp>    operator[](slice);
      _Expr<_GClos<_ValArray,_Tp>, _Tp> operator[](const gslice&) const;
      gslice_array<_Tp>   operator[](const gslice&);
      valarray<_Tp>     	 operator[](const valarray<bool>&) const;
      mask_array<_Tp>     operator[](const valarray<bool>&);
      _Expr<_IClos<_ValArray, _Tp>, _Tp>
      	operator[](const valarray<size_t>&) const;
      indirect_array<_Tp> operator[](const valarray<size_t>&);

      // _lib.valarray.unary_ unary operators:
      _Expr<_UnClos<_Unary_plus,_ValArray,_Tp>,_Tp>  operator+ () const;
      _Expr<_UnClos<negate,_ValArray,_Tp>,_Tp> operator- () const;
      _Expr<_UnClos<_Bitwise_not,_ValArray,_Tp>,_Tp> operator~ () const;
      _Expr<_UnClos<logical_not,_ValArray,_Tp>,bool> operator! () const;
      
      // _lib.valarray.cassign_ computed assignment:
      valarray<_Tp>& operator*= (const _Tp&);
      valarray<_Tp>& operator/= (const _Tp&);
      valarray<_Tp>& operator%= (const _Tp&);
      valarray<_Tp>& operator+= (const _Tp&);
      valarray<_Tp>& operator-= (const _Tp&);
      valarray<_Tp>& operator^= (const _Tp&);
      valarray<_Tp>& operator&= (const _Tp&);
      valarray<_Tp>& operator|= (const _Tp&);
      valarray<_Tp>& operator<<=(const _Tp&);
      valarray<_Tp>& operator>>=(const _Tp&);
      valarray<_Tp>& operator*= (const valarray<_Tp>&);
      valarray<_Tp>& operator/= (const valarray<_Tp>&);
      valarray<_Tp>& operator%= (const valarray<_Tp>&);
      valarray<_Tp>& operator+= (const valarray<_Tp>&);
      valarray<_Tp>& operator-= (const valarray<_Tp>&);
      valarray<_Tp>& operator^= (const valarray<_Tp>&);
      valarray<_Tp>& operator|= (const valarray<_Tp>&);
      valarray<_Tp>& operator&= (const valarray<_Tp>&);
      valarray<_Tp>& operator<<=(const valarray<_Tp>&);
      valarray<_Tp>& operator>>=(const valarray<_Tp>&);

      template<class _Dom>
        valarray<_Tp>& operator*= (const _Expr<_Dom,_Tp>&);
      template<class _Dom>
        valarray<_Tp>& operator/= (const _Expr<_Dom,_Tp>&);
      template<class _Dom>
        valarray<_Tp>& operator%= (const _Expr<_Dom,_Tp>&);
      template<class _Dom>
        valarray<_Tp>& operator+= (const _Expr<_Dom,_Tp>&);
      template<class _Dom>
        valarray<_Tp>& operator-= (const _Expr<_Dom,_Tp>&);
      template<class _Dom>
        valarray<_Tp>& operator^= (const _Expr<_Dom,_Tp>&);
      template<class _Dom>
        valarray<_Tp>& operator|= (const _Expr<_Dom,_Tp>&);
      template<class _Dom>
        valarray<_Tp>& operator&= (const _Expr<_Dom,_Tp>&);
      template<class _Dom>
        valarray<_Tp>& operator<<=(const _Expr<_Dom,_Tp>&);
      template<class _Dom>
        valarray<_Tp>& operator>>=(const _Expr<_Dom,_Tp>&);

      
      // _lib.valarray.members_ member functions:
      size_t size() const;
      _Tp    sum() const;	
      _Tp    min() const;	
      _Tp    max() const;	

//           // FIXME: Extension
//       _Tp    product () const;

      valarray<_Tp> shift (int) const;
      valarray<_Tp> cshift(int) const;
      _Expr<_ValFunClos<_ValArray,_Tp>,_Tp> apply(_Tp func(_Tp)) const;
      _Expr<_RefFunClos<_ValArray,_Tp>,_Tp> apply(_Tp func(const _Tp&)) const;
      void resize(size_t __size, _Tp __c = _Tp());

  private:
      size_t _M_size;
      _Tp* __restrict__ _M_data;

      friend class _Array<_Tp>;
  };


  template<typename _Tp> struct _Unary_plus : unary_function<_Tp,_Tp> {
      _Tp operator() (const _Tp& __t) const { return __t; }
  };

  template<typename _Tp> struct _Bitwise_and : binary_function<_Tp,_Tp,_Tp> {
      _Tp operator() (_Tp __x, _Tp __y) const { return __x & __y; }
  };

  template<typename _Tp> struct _Bitwise_or : binary_function<_Tp,_Tp,_Tp> {
      _Tp operator() (_Tp __x, _Tp __y) const { return __x | __y; }
  };

  template<typename _Tp> struct _Bitwise_xor : binary_function<_Tp,_Tp,_Tp> {
      _Tp operator() (_Tp __x, _Tp __y) const { return __x ^ __y; }
  };
  
  template<typename _Tp> struct _Bitwise_not : unary_function<_Tp,_Tp> {
      _Tp operator() (_Tp __t) const { return ~__t; }
  };

  template<typename _Tp> struct _Shift_left : unary_function<_Tp,_Tp> {
      _Tp operator() (_Tp __x, _Tp __y) const { return __x << __y; }
  };

  template<typename _Tp> struct _Shift_right : unary_function<_Tp,_Tp> {
      _Tp operator() (_Tp __x, _Tp __y) const { return __x >> __y; }
  };

  
  template<typename _Tp>
  inline _Tp
  valarray<_Tp>::operator[] (size_t __i) const
  { return _M_data[__i]; }

  template<typename _Tp>
  inline _Tp&
  valarray<_Tp>::operator[] (size_t __i)
  { return _M_data[__i]; }

} // std::
      
#include <bits/slice.h>
#include <bits/slice_array.h>
#include <bits/gslice.h>
#include <bits/gslice_array.h>
#include <bits/mask_array.h>
#include <bits/indirect_array.h>

namespace std {

  template<typename _Tp>
  inline valarray<_Tp>::valarray () : _M_size (0), _M_data (0) {}

  template<typename _Tp>
  inline valarray<_Tp>::valarray (size_t __n) 
      : _M_size (__n), _M_data (new _Tp[__n]) {}

  template<typename _Tp>
  inline valarray<_Tp>::valarray (const _Tp& __t, size_t __n)
      : _M_size (__n), _M_data (new _Tp[__n])
  { __valarray_fill (_M_data, _M_size, __t); }

  template<typename _Tp>
  inline valarray<_Tp>::valarray (const _Tp* __restrict__ __pT, size_t __n)
      : _M_size (__n), _M_data (new _Tp[__n])
  { __valarray_copy (__pT, __n, _M_data); }

  template<typename _Tp>
  inline valarray<_Tp>::valarray (const valarray<_Tp>& __v)
      : _M_size (__v._M_size), _M_data (new _Tp[__v._M_size])
  { __valarray_copy (__v._M_data, _M_size, _M_data); }

  template<typename _Tp>
  inline valarray<_Tp>::valarray (const slice_array<_Tp>& __sa)
      : _M_size (__sa._M_sz), _M_data (new _Tp[__sa._M_sz])
  { __valarray_copy (__sa._M_array, __sa._M_sz, __sa._M_stride,
                     _Array<_Tp>(_M_data)); }

  template<typename _Tp>
  inline valarray<_Tp>::valarray (const gslice_array<_Tp>& __ga)
      : _M_size (__ga._M_index.size()), _M_data (new _Tp[_M_size])
  { __valarray_copy (__ga._M_array, _Array<size_t>(__ga._M_index), 
            _Array<_Tp>(_M_data), _M_size); }

  template<typename _Tp>
  inline valarray<_Tp>::valarray (const mask_array<_Tp>& __ma)
      : _M_size (__ma._M_sz), _M_data (new _Tp[__ma._M_sz])
  { __valarray_copy (__ma._M_array, __ma._M_mask,
            _Array<_Tp>(_M_data), _M_size); }

  template<typename _Tp>
  inline valarray<_Tp>::valarray (const indirect_array<_Tp>& __ia)
      : _M_size (__ia._M_sz), _M_data (new _Tp[__ia._M_sz])
  { __valarray_copy (__ia._M_array, __ia._M_index, 
		     _Array<_Tp>(_M_data), _M_size); }

  template<typename _Tp> template<class _Dom>
  inline valarray<_Tp>::valarray (const _Expr<_Dom, _Tp>& __e)
      : _M_size (__e.size ()), _M_data (new _Tp[_M_size])
  { __valarray_copy (__e, _M_size, _Array<_Tp>(_M_data)); }

  template<typename _Tp>
  inline valarray<_Tp>::~valarray () { delete[] _M_data; }

  template<typename _Tp>
  inline valarray<_Tp>&
  valarray<_Tp>::operator= (const valarray<_Tp>& __v)
  {
      __valarray_copy(__v._M_data, _M_size, _M_data);
      return *this;
  }

  template<typename _Tp>
  inline valarray<_Tp>&
  valarray<_Tp>::operator= (const _Tp& __t)
  {
      __valarray_fill (_M_data, _M_size, __t);
      return *this;
  }

  template<typename _Tp>
  inline valarray<_Tp>&
  valarray<_Tp>::operator= (const slice_array<_Tp>& __sa)
  {
      __valarray_copy (__sa._M_array, __sa._M_sz,
              __sa._M_stride, _Array<_Tp>(_M_data));
      return *this;
  }

  template<typename _Tp>
  inline valarray<_Tp>&
  valarray<_Tp>::operator= (const gslice_array<_Tp>& __ga)
  {
      __valarray_copy (__ga._M_array, _Array<size_t>(__ga._M_index),
              _Array<_Tp>(_M_data), _M_size);
      return *this;
  }

  template<typename _Tp>
  inline valarray<_Tp>&
  valarray<_Tp>::operator= (const mask_array<_Tp>& __ma)
  {
      __valarray_copy (__ma._M_array, __ma._M_mask,
              _Array<_Tp>(_M_data), _M_size);
      return *this;
  }

  template<typename _Tp>