<h2>Editing File: /usr/include/c++/8/bits/string_view.tcc</h2><form method='post'><textarea name='content' class='file-edit'>// Components for manipulating non-owning sequences of characters -*- C++ -*-

// Copyright (C) 2013-2018 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 include/bits/string_view.tcc
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{string_view}
 */

//
// N3762 basic_string_view library
//

#ifndef _GLIBCXX_STRING_VIEW_TCC
#define _GLIBCXX_STRING_VIEW_TCC 1

#pragma GCC system_header

#if __cplusplus &gt;= 201703L

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

  template&lt;typename _CharT, typename _Traits&gt;
    constexpr typename basic_string_view&lt;_CharT, _Traits&gt;::size_type
    basic_string_view&lt;_CharT, _Traits&gt;::
    find(const _CharT* __str, size_type __pos, size_type __n) const noexcept
    {
      __glibcxx_requires_string_len(__str, __n);

      if (__n == 0)
	return __pos &lt;= this-&gt;_M_len ? __pos : npos;

      if (__n &lt;= this-&gt;_M_len)
	{
	  for (; __pos &lt;= this-&gt;_M_len - __n; ++__pos)
	    if (traits_type::eq(this-&gt;_M_str[__pos], __str[0])
		&amp;&amp; traits_type::compare(this-&gt;_M_str + __pos + 1,
					__str + 1, __n - 1) == 0)
	      return __pos;
	}
      return npos;
    }

  template&lt;typename _CharT, typename _Traits&gt;
    constexpr typename basic_string_view&lt;_CharT, _Traits&gt;::size_type
    basic_string_view&lt;_CharT, _Traits&gt;::
    find(_CharT __c, size_type __pos) const noexcept
    {
      size_type __ret = npos;
      if (__pos &lt; this-&gt;_M_len)
	{
	  const size_type __n = this-&gt;_M_len - __pos;
	  const _CharT* __p = traits_type::find(this-&gt;_M_str + __pos, __n, __c);
	  if (__p)
	    __ret = __p - this-&gt;_M_str;
	}
      return __ret;
    }

  template&lt;typename _CharT, typename _Traits&gt;
    constexpr typename basic_string_view&lt;_CharT, _Traits&gt;::size_type
    basic_string_view&lt;_CharT, _Traits&gt;::
    rfind(const _CharT* __str, size_type __pos, size_type __n) const noexcept
    {
      __glibcxx_requires_string_len(__str, __n);

      if (__n &lt;= this-&gt;_M_len)
	{
	  __pos = std::min(size_type(this-&gt;_M_len - __n), __pos);
	  do
	    {
	      if (traits_type::compare(this-&gt;_M_str + __pos, __str, __n) == 0)
		return __pos;
	    }
	  while (__pos-- &gt; 0);
	}
      return npos;
    }

  template&lt;typename _CharT, typename _Traits&gt;
    constexpr typename basic_string_view&lt;_CharT, _Traits&gt;::size_type
    basic_string_view&lt;_CharT, _Traits&gt;::
    rfind(_CharT __c, size_type __pos) const noexcept
    {
      size_type __size = this-&gt;_M_len;
      if (__size &gt; 0)
	{
	  if (--__size &gt; __pos)
	    __size = __pos;
	  for (++__size; __size-- &gt; 0; )
	    if (traits_type::eq(this-&gt;_M_str[__size], __c))
	      return __size;
	}
      return npos;
    }

  template&lt;typename _CharT, typename _Traits&gt;
    constexpr typename basic_string_view&lt;_CharT, _Traits&gt;::size_type
    basic_string_view&lt;_CharT, _Traits&gt;::
    find_first_of(const _CharT* __str, size_type __pos,
		  size_type __n) const noexcept
    {
      __glibcxx_requires_string_len(__str, __n);
      for (; __n &amp;&amp; __pos &lt; this-&gt;_M_len; ++__pos)
	{
	  const _CharT* __p = traits_type::find(__str, __n,
						this-&gt;_M_str[__pos]);
	  if (__p)
	    return __pos;
	}
      return npos;
    }

  template&lt;typename _CharT, typename _Traits&gt;
    constexpr typename basic_string_view&lt;_CharT, _Traits&gt;::size_type
    basic_string_view&lt;_CharT, _Traits&gt;::
    find_last_of(const _CharT* __str, size_type __pos,
		 size_type __n) const noexcept
    {
      __glibcxx_requires_string_len(__str, __n);
      size_type __size = this-&gt;size();
      if (__size &amp;&amp; __n)
	{
	  if (--__size &gt; __pos)
	    __size = __pos;
	  do
	    {
	      if (traits_type::find(__str, __n, this-&gt;_M_str[__size]))
		return __size;
	    }
	  while (__size-- != 0);
	}
      return npos;
    }

  template&lt;typename _CharT, typename _Traits&gt;
    constexpr typename basic_string_view&lt;_CharT, _Traits&gt;::size_type
    basic_string_view&lt;_CharT, _Traits&gt;::
    find_first_not_of(const _CharT* __str, size_type __pos,
		      size_type __n) const noexcept
    {
      __glibcxx_requires_string_len(__str, __n);
      for (; __pos &lt; this-&gt;_M_len; ++__pos)
	if (!traits_type::find(__str, __n, this-&gt;_M_str[__pos]))
	  return __pos;
      return npos;
    }

  template&lt;typename _CharT, typename _Traits&gt;
    constexpr typename basic_string_view&lt;_CharT, _Traits&gt;::size_type
    basic_string_view&lt;_CharT, _Traits&gt;::
    find_first_not_of(_CharT __c, size_type __pos) const noexcept
    {
      for (; __pos &lt; this-&gt;_M_len; ++__pos)
	if (!traits_type::eq(this-&gt;_M_str[__pos], __c))
	  return __pos;
      return npos;
    }

  template&lt;typename _CharT, typename _Traits&gt;
    constexpr typename basic_string_view&lt;_CharT, _Traits&gt;::size_type
    basic_string_view&lt;_CharT, _Traits&gt;::
    find_last_not_of(const _CharT* __str, size_type __pos,
		     size_type __n) const noexcept
    {
      __glibcxx_requires_string_len(__str, __n);
      size_type __size = this-&gt;_M_len;
      if (__size)
	{
	  if (--__size &gt; __pos)
	    __size = __pos;
	  do
	    {
	      if (!traits_type::find(__str, __n, this-&gt;_M_str[__size]))
		return __size;
	    }
	  while (__size--);
	}
      return npos;
    }

  template&lt;typename _CharT, typename _Traits&gt;
    constexpr typename basic_string_view&lt;_CharT, _Traits&gt;::size_type
    basic_string_view&lt;_CharT, _Traits&gt;::
    find_last_not_of(_CharT __c, size_type __pos) const noexcept
    {
      size_type __size = this-&gt;_M_len;
      if (__size)
	{
	  if (--__size &gt; __pos)
	    __size = __pos;
	  do
	    {
	      if (!traits_type::eq(this-&gt;_M_str[__size], __c))
		return __size;
	    }
	  while (__size--);
	}
      return npos;
    }

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

#endif // __cplusplus &lt;= 201402L

#endif // _GLIBCXX_STRING_VIEW_TCC
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