valarray_array.h

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

// Copyright (C) 1997, 1998, 1999, 2000, 2003
//  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 <[e-mail]>

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

#ifndef _VALARRAY_ARRAY_H
#define _VALARRAY_ARRAY_H 1

#pragma GCC system_header

#include <bits/c++config.h>
#include <bits/cpp_type_traits.h>
#include <cstdlib>
#include <cstring>
#include <new>

namespace std
{
  //
  // Helper functions on raw pointers
  //

  // We get memory by the old fashion way
  inline void*
  __valarray_get_memory(size_t __n)
  { return operator new(__n); }

  template<typename _Tp>
     inline _Tp*__restrict__
     __valarray_get_storage(size_t __n)
     {
       return static_cast<_Tp*__restrict__>
         (std::__valarray_get_memory(__n * sizeof(_Tp)));
     }

  // Return memory to the system
  inline void
  __valarray_release_memory(void* __p)
  { operator delete(__p); }

  // Turn a raw-memory into an array of _Tp filled with _Tp()
  // This is required in 'valarray<T> v(n);'
  template<typename _Tp, bool>
     struct _Array_default_ctor
     {
       // Please note that this isn't exception safe.  But
       // valarrays aren't required to be exception safe.
       inline static void
       _S_do_it(_Tp* __restrict__ __b, _Tp* __restrict__ __e)
       { while (__b != __e) new(__b++) _Tp(); }
     };

  template<typename _Tp>
     struct _Array_default_ctor<_Tp, true>
     {
       // For fundamental types, it suffices to say 'memset()'
       inline static void
       _S_do_it(_Tp* __restrict__ __b, _Tp* __restrict__ __e)
       { std::memset(__b, 0, (__e - __b)*sizeof(_Tp)); }
     };

  template<typename _Tp>
     inline void
     __valarray_default_construct(_Tp* __restrict__ __b, _Tp* __restrict__ __e)
     {
       _Array_default_ctor<_Tp, __is_fundamental<_Tp>::_M_type>::
         _S_do_it(__b, __e);
     }

  // Turn a raw-memory into an array of _Tp filled with __t
  // This is the required in valarray<T> v(n, t).  Also
  // used in valarray<>::resize().
  template<typename _Tp, bool>
     struct _Array_init_ctor
     {
       // Please note that this isn't exception safe.  But
       // valarrays aren't required to be exception safe.
       inline static void
       _S_do_it(_Tp* __restrict__ __b, _Tp* __restrict__ __e, const _Tp __t)
       { while (__b != __e) new(__b++) _Tp(__t); }
     };

  template<typename _Tp>
     struct _Array_init_ctor<_Tp, true>
     {
       inline static void
       _S_do_it(_Tp* __restrict__ __b, _Tp* __restrict__ __e,  const _Tp __t)
       { while (__b != __e) *__b++ = __t; }
     };

  template<typename _Tp>
     inline void
     __valarray_fill_construct(_Tp* __restrict__ __b, _Tp* __restrict__ __e,
                               const _Tp __t)
     {
       _Array_init_ctor<_Tp, __is_fundamental<_Tp>::_M_type>::
         _S_do_it(__b, __e, __t);
     }

  //
  // copy-construct raw array [__o, *) from plain array [__b, __e)
  // We can't just say 'memcpy()'
  //
  template<typename _Tp, bool>
     struct _Array_copy_ctor
     {
       // Please note that this isn't exception safe.  But
       // valarrays aren't required to be exception safe.
       inline static void
       _S_do_it(const _Tp* __restrict__ __b, const _Tp* __restrict__ __e,
                _Tp* __restrict__ __o)
       { while (__b != __e) new(__o++) _Tp(*__b++); }
     };

  template<typename _Tp>
     struct _Array_copy_ctor<_Tp, true>
     {
       inline static void
       _S_do_it(const _Tp* __restrict__ __b, const _Tp* __restrict__ __e,
                _Tp* __restrict__ __o)
       { std::memcpy(__o, __b, (__e - __b)*sizeof(_Tp)); }
     };

  template<typename _Tp>
     inline void
     __valarray_copy_construct(const _Tp* __restrict__ __b,
                               const _Tp* __restrict__ __e,
                               _Tp* __restrict__ __o)
     {
       _Array_copy_ctor<_Tp, __is_fundamental<_Tp>::_M_type>::
         _S_do_it(__b, __e, __o);
     }

  // copy-construct raw array [__o, *) from strided array __a[<__n : __s>]
  template<typename _Tp>
     inline void
     __valarray_copy_construct (const _Tp* __restrict__ __a, size_t __n,
                                size_t __s, _Tp* __restrict__ __o)
     {
       if (__is_fundamental<_Tp>::_M_type)
         while (__n--) { *__o++ = *__a; __a += __s; }
       else
         while (__n--) { new(__o++) _Tp(*__a);  __a += __s; }
     }

  // copy-construct raw array [__o, *) from indexed array __a[__i[<__n>]]
  template<typename _Tp>
     inline void
     __valarray_copy_construct (const _Tp* __restrict__ __a,
                                const size_t* __restrict__ __i,
                                _Tp* __restrict__ __o, size_t __n)
     {
       if (__is_fundamental<_Tp>::_M_type)
         while (__n--) *__o++ = __a[*__i++];
       else
         while (__n--) new (__o++) _Tp(__a[*__i++]);
     }

  // Do the necessary cleanup when we're done with arrays.
  template<typename _Tp>
     inline void
     __valarray_destroy_elements(_Tp* __restrict__ __b, _Tp* __restrict__ __e)
     {
       if (!__is_fundamental<_Tp>::_M_type)
         while (__b != __e) { __b->~_Tp(); ++__b; }
     }

  // Fill a plain array __a[<__n>] with __t
  template<typename _Tp>
     inline void
     __valarray_fill (_Tp* __restrict__ __a, size_t __n, const _Tp& __t)
     { while (__n--) *__a++ = __t; }

  // fill strided array __a[<__n-1 : __s>] with __t
  template<typename _Tp>
     inline void
     __valarray_fill (_Tp* __restrict__ __a, size_t __n,
                      size_t __s, const _Tp& __t)
     { for (size_t __i=0; __i<__n; ++__i, __a+=__s) *__a = __t; }

  // fill indir   ect array __a[__i[<__n>]] with __i
  template<typename _Tp>
     inline void
     __valarray_fill(_Tp* __restrict__ __a, const size_t* __restrict__ __i,
                     size_t __n, const _Tp& __t)
     { for (size_t __j=0; __j<__n; ++__j, ++__i) __a[*__i] = __t; }

  // copy plain array __a[<__n>] in __b[<__n>]
  // For non-fundamental types, it is wrong to say 'memcpy()'
  template<typename _Tp, bool>
     struct _Array_copier
     {
       inline static void
       _S_do_it(const _Tp* __restrict__ __a, size_t __n, _Tp* __restrict__ __b)
       { while (__n--) *__b++ = *__a++; }
     };

  template<typename _Tp>
     struct _Array_copier<_Tp, true>
     {
       inline static void
       _S_do_it(const _Tp* __restrict__ __a, size_t __n, _Tp* __restrict__ __b)
       { std::memcpy (__b, __a, __n * sizeof (_Tp)); }
     };

  // Copy a plain array __a[<__n>] into a play array __b[<>]
  template<typename _Tp>
     inline void
     __valarray_copy(const _Tp* __restrict__ __a, size_t __n,
                      _Tp* __restrict__ __b)
     {
       _Array_copier<_Tp, __is_fundamental<_Tp>::_M_type>::
         _S_do_it(__a, __n, __b);
     }

  // Copy strided array __a[<__n : __s>] in plain __b[<__n>]
  template<typename _Tp>
     inline void
     __valarray_copy(const _Tp* __restrict__ __a, size_t __n, size_t __s,
                      _Tp* __restrict__ __b)
     { for (size_t __i=0; __i<__n; ++__i, ++__b, __a += __s) *__b = *__a; }

  // Copy a plain array  __a[<__n>] into a strided array __b[<__n : __s>]
  template<typename _Tp>
     inline void
     __valarray_copy(const _Tp* __restrict__ __a, _Tp* __restrict__ __b,
                      size_t __n, size_t __s)
     { for (size_t __i=0; __i<__n; ++__i, ++__a, __b+=__s) *__b = *__a; }

  // Copy strided array __src[<__n : __s1>] into another
  // strided array __dst[< : __s2>].  Their sizes must match.
  template<typename _Tp>
     inline void
     __valarray_copy(const _Tp* __restrict__ __src, size_t __n, size_t __s1,
                     _Tp* __restrict__ __dst, size_t __s2)
     {
       for (size_t __i = 0; __i < __n; ++__i)
         __dst[__i * __s2] = __src [ __i * __s1];
     }


  // Copy an indexed array __a[__i[<__n>]] in plain array __b[<__n>]
  template<typename _Tp>
     inline void
     __valarray_copy (const _Tp* __restrict__ __a,
                      const size_t* __restrict__ __i,
                      _Tp* __restrict__ __b, size_t __n)
     { for (size_t __j=0; __j<__n; ++__j, ++__b, ++__i) *__b = __a[*__i]; }

  // Copy a plain array __a[<__n>] in an indexed array __b[__i[<__n>]]
  template<typename _Tp>
     inline void
     __valarray_copy (const _Tp* __restrict__ __a, size_t __n,
                      _Tp* __restrict__ __b, const size_t* __restrict__ __i)
     { for (size_t __j=0; __j<__n; ++__j, ++__a, ++__i) __b[*__i] = *__a; }

  // Copy the __n first elements of an indexed array __src[<__i>] into
  // another indexed array __dst[<__j>].
  template<typename _Tp>
     inline void
     __valarray_copy(const _Tp* __restrict__ __src, size_t __n,
                     const size_t* __restrict__ __i,
                     _Tp* __restrict__ __dst, const size_t* __restrict__ __j)
     {
       for (size_t __k = 0; __k < __n; ++__k)
         __dst[*__j++] = __src[*__i++];
     }

  //
  // Compute the sum of elements in range [__f, __l)
  // This is a naive algorithm.  It suffers from cancelling.
  // In the future try to specialize
  // for _Tp = float, double, long double using a more accurate
  // algorithm.
  //
  template<typename _Tp>
     inline _Tp
     __valarray_sum(const _Tp* __restrict__ __f, const _Tp* __restrict__ __l)
     {
       _Tp __r = _Tp();
       while (__f != __l) __r += *__f++;