<h2>Editing File: /usr/include/c++/8/bits/locale_classes.tcc</h2><form method='post'><textarea name='content' class='file-edit'>// Locale support -*- C++ -*-

// Copyright (C) 2007-2018 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 3, 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.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// &lt;http://www.gnu.org/licenses/&gt;.

/** @file bits/locale_classes.tcc
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{locale}
 */

//
// ISO C++ 14882: 22.1  Locales
//

#ifndef _LOCALE_CLASSES_TCC
#define _LOCALE_CLASSES_TCC 1

#pragma GCC system_header

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

  template&lt;typename _Facet&gt;
    locale::
    locale(const locale&amp; __other, _Facet* __f)
    {
      _M_impl = new _Impl(*__other._M_impl, 1);

      __try
	{ _M_impl-&gt;_M_install_facet(&amp;_Facet::id, __f); }
      __catch(...)
	{
	  _M_impl-&gt;_M_remove_reference();
	  __throw_exception_again;
	}
      delete [] _M_impl-&gt;_M_names[0];
      _M_impl-&gt;_M_names[0] = 0;   // Unnamed.
    }

  template&lt;typename _Facet&gt;
    locale
    locale::
    combine(const locale&amp; __other) const
    {
      _Impl* __tmp = new _Impl(*_M_impl, 1);
      __try
	{
	  __tmp-&gt;_M_replace_facet(__other._M_impl, &amp;_Facet::id);
	}
      __catch(...)
	{
	  __tmp-&gt;_M_remove_reference();
	  __throw_exception_again;
	}
      return locale(__tmp);
    }

  template&lt;typename _CharT, typename _Traits, typename _Alloc&gt;
    bool
    locale::
    operator()(const basic_string&lt;_CharT, _Traits, _Alloc&gt;&amp; __s1,
	       const basic_string&lt;_CharT, _Traits, _Alloc&gt;&amp; __s2) const
    {
      typedef std::collate&lt;_CharT&gt; __collate_type;
      const __collate_type&amp; __collate = use_facet&lt;__collate_type&gt;(*this);
      return (__collate.compare(__s1.data(), __s1.data() + __s1.length(),
				__s2.data(), __s2.data() + __s2.length()) &lt; 0);
    }

  /**
   *  @brief  Test for the presence of a facet.
   *  @ingroup locales
   *
   *  has_facet tests the locale argument for the presence of the facet type
   *  provided as the template parameter.  Facets derived from the facet
   *  parameter will also return true.
   *
   *  @tparam  _Facet  The facet type to test the presence of.
   *  @param  __loc  The locale to test.
   *  @return  true if @p __loc contains a facet of type _Facet, else false.
  */
  template&lt;typename _Facet&gt;
    bool
    has_facet(const locale&amp; __loc) throw()
    {
      const size_t __i = _Facet::id._M_id();
      const locale::facet** __facets = __loc._M_impl-&gt;_M_facets;
      return (__i &lt; __loc._M_impl-&gt;_M_facets_size
#if __cpp_rtti
	      &amp;&amp; dynamic_cast&lt;const _Facet*&gt;(__facets[__i]));
#else
              &amp;&amp; static_cast&lt;const _Facet*&gt;(__facets[__i]));
#endif
    }

  /**
   *  @brief  Return a facet.
   *  @ingroup locales
   *
   *  use_facet looks for and returns a reference to a facet of type Facet
   *  where Facet is the template parameter.  If has_facet(locale) is true,
   *  there is a suitable facet to return.  It throws std::bad_cast if the
   *  locale doesn't contain a facet of type Facet.
   *
   *  @tparam  _Facet  The facet type to access.
   *  @param  __loc  The locale to use.
   *  @return  Reference to facet of type Facet.
   *  @throw  std::bad_cast if @p __loc doesn't contain a facet of type _Facet.
  */
  template&lt;typename _Facet&gt;
    const _Facet&amp;
    use_facet(const locale&amp; __loc)
    {
      const size_t __i = _Facet::id._M_id();
      const locale::facet** __facets = __loc._M_impl-&gt;_M_facets;
      if (__i &gt;= __loc._M_impl-&gt;_M_facets_size || !__facets[__i])
        __throw_bad_cast();
#if __cpp_rtti
      return dynamic_cast&lt;const _Facet&amp;&gt;(*__facets[__i]);
#else
      return static_cast&lt;const _Facet&amp;&gt;(*__facets[__i]);
#endif
    }


  // Generic version does nothing.
  template&lt;typename _CharT&gt;
    int
    collate&lt;_CharT&gt;::_M_compare(const _CharT*, const _CharT*) const throw ()
    { return 0; }

  // Generic version does nothing.
  template&lt;typename _CharT&gt;
    size_t
    collate&lt;_CharT&gt;::_M_transform(_CharT*, const _CharT*, size_t) const throw ()
    { return 0; }

  template&lt;typename _CharT&gt;
    int
    collate&lt;_CharT&gt;::
    do_compare(const _CharT* __lo1, const _CharT* __hi1,
	       const _CharT* __lo2, const _CharT* __hi2) const
    {
      // strcoll assumes zero-terminated strings so we make a copy
      // and then put a zero at the end.
      const string_type __one(__lo1, __hi1);
      const string_type __two(__lo2, __hi2);

      const _CharT* __p = __one.c_str();
      const _CharT* __pend = __one.data() + __one.length();
      const _CharT* __q = __two.c_str();
      const _CharT* __qend = __two.data() + __two.length();

      // strcoll stops when it sees a nul character so we break
      // the strings into zero-terminated substrings and pass those
      // to strcoll.
      for (;;)
	{
	  const int __res = _M_compare(__p, __q);
	  if (__res)
	    return __res;

	  __p += char_traits&lt;_CharT&gt;::length(__p);
	  __q += char_traits&lt;_CharT&gt;::length(__q);
	  if (__p == __pend &amp;&amp; __q == __qend)
	    return 0;
	  else if (__p == __pend)
	    return -1;
	  else if (__q == __qend)
	    return 1;

	  __p++;
	  __q++;
	}
    }

  template&lt;typename _CharT&gt;
    typename collate&lt;_CharT&gt;::string_type
    collate&lt;_CharT&gt;::
    do_transform(const _CharT* __lo, const _CharT* __hi) const
    {
      string_type __ret;

      // strxfrm assumes zero-terminated strings so we make a copy
      const string_type __str(__lo, __hi);

      const _CharT* __p = __str.c_str();
      const _CharT* __pend = __str.data() + __str.length();

      size_t __len = (__hi - __lo) * 2;

      _CharT* __c = new _CharT[__len];

      __try
	{
	  // strxfrm stops when it sees a nul character so we break
	  // the string into zero-terminated substrings and pass those
	  // to strxfrm.
	  for (;;)
	    {
	      // First try a buffer perhaps big enough.
	      size_t __res = _M_transform(__c, __p, __len);
	      // If the buffer was not large enough, try again with the
	      // correct size.
	      if (__res &gt;= __len)
		{
		  __len = __res + 1;
		  delete [] __c, __c = 0;
		  __c = new _CharT[__len];
		  __res = _M_transform(__c, __p, __len);
		}

	      __ret.append(__c, __res);
	      __p += char_traits&lt;_CharT&gt;::length(__p);
	      if (__p == __pend)
		break;

	      __p++;
	      __ret.push_back(_CharT());
	    }
	}
      __catch(...)
	{
	  delete [] __c;
	  __throw_exception_again;
	}

      delete [] __c;

      return __ret;
    }

  template&lt;typename _CharT&gt;
    long
    collate&lt;_CharT&gt;::
    do_hash(const _CharT* __lo, const _CharT* __hi) const
    {
      unsigned long __val = 0;
      for (; __lo &lt; __hi; ++__lo)
	__val =
	  *__lo + ((__val &lt;&lt; 7)
		   | (__val &gt;&gt; (__gnu_cxx::__numeric_traits&lt;unsigned long&gt;::
				__digits - 7)));
      return static_cast&lt;long&gt;(__val);
    }

  // Inhibit implicit instantiations for required instantiations,
  // which are defined via explicit instantiations elsewhere.
#if _GLIBCXX_EXTERN_TEMPLATE
  extern template class collate&lt;char&gt;;
  extern template class collate_byname&lt;char&gt;;

  extern template
    const collate&lt;char&gt;&amp;
    use_facet&lt;collate&lt;char&gt; &gt;(const locale&amp;);

  extern template
    bool
    has_facet&lt;collate&lt;char&gt; &gt;(const locale&amp;);

#ifdef _GLIBCXX_USE_WCHAR_T
  extern template class collate&lt;wchar_t&gt;;
  extern template class collate_byname&lt;wchar_t&gt;;

  extern template
    const collate&lt;wchar_t&gt;&amp;
    use_facet&lt;collate&lt;wchar_t&gt; &gt;(const locale&amp;);

  extern template
    bool
    has_facet&lt;collate&lt;wchar_t&gt; &gt;(const locale&amp;);
#endif
#endif

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

#endif
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