libstdc++-v3/include/experimental/bits/string_view.tcc

   1 // Components for manipulating non-owning sequences of characters -*- C++ -*-
   2
   3 // Copyright (C) 2013-2017 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 /** @file experimental/bits/string_view.tcc
  26  *  This is an internal header file, included by other library headers.
  27  *  Do not attempt to use it directly. @headername{experimental/string_view}
  28  */
  29
  30 //
  31 // N3762 basic_string_view library
  32 //
  33
  34 #ifndef _GLIBCXX_EXPERIMENTAL_STRING_VIEW_TCC
  35 #define _GLIBCXX_EXPERIMENTAL_STRING_VIEW_TCC 1
  36
  37 #pragma GCC system_header
  38
  39 #if __cplusplus <= 201103L
  40 # include <bits/c++14_warning.h>
  41 #else
  42
  43 namespace std _GLIBCXX_VISIBILITY(default)
  44 {
  45 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  46
  47 namespace experimental
  48 {
  49 inline namespace fundamentals_v1
  50 {
  51   template<typename _CharT, typename _Traits>
  52     constexpr typename basic_string_view<_CharT, _Traits>::size_type
  53     basic_string_view<_CharT, _Traits>::
  54     find(const _CharT* __str, size_type __pos, size_type __n) const noexcept
  55     {
  56       __glibcxx_requires_string_len(__str, __n);
  57
  58       if (__n == 0)
  59         return __pos <= this->_M_len ? __pos : npos;
  60
  61       if (__n <= this->_M_len)
  62         {
  63           for (; __pos <= this->_M_len - __n; ++__pos)
  64             if (traits_type::eq(this->_M_str[__pos], __str[0])
  65                 && traits_type::compare(this->_M_str + __pos + 1,
  66                                         __str + 1, __n - 1) == 0)
  67               return __pos;
  68         }
  69       return npos;
  70     }
  71
  72   template<typename _CharT, typename _Traits>
  73     constexpr typename basic_string_view<_CharT, _Traits>::size_type
  74     basic_string_view<_CharT, _Traits>::
  75     find(_CharT __c, size_type __pos) const noexcept
  76     {
  77       size_type __ret = npos;
  78       if (__pos < this->_M_len)
  79         {
  80           const size_type __n = this->_M_len - __pos;
  81           const _CharT* __p = traits_type::find(this->_M_str + __pos, __n, __c);
  82           if (__p)
  83             __ret = __p - this->_M_str;
  84         }
  85       return __ret;
  86     }
  87
  88   template<typename _CharT, typename _Traits>
  89     constexpr typename basic_string_view<_CharT, _Traits>::size_type
  90     basic_string_view<_CharT, _Traits>::
  91     rfind(const _CharT* __str, size_type __pos, size_type __n) const noexcept
  92     {
  93       __glibcxx_requires_string_len(__str, __n);
  94
  95       if (__n <= this->_M_len)
  96         {
  97           __pos = std::min(size_type(this->_M_len - __n), __pos);
  98           do
  99             {
 100               if (traits_type::compare(this->_M_str + __pos, __str, __n) == 0)
 101                 return __pos;
 102             }
 103           while (__pos-- > 0);
 104         }
 105       return npos;
 106     }
 107
 108   template<typename _CharT, typename _Traits>
 109     constexpr typename basic_string_view<_CharT, _Traits>::size_type
 110     basic_string_view<_CharT, _Traits>::
 111     rfind(_CharT __c, size_type __pos) const noexcept
 112     {
 113       size_type __size = this->_M_len;
 114       if (__size > 0)
 115         {
 116           if (--__size > __pos)
 117             __size = __pos;
 118           for (++__size; __size-- > 0; )
 119             if (traits_type::eq(this->_M_str[__size], __c))
 120               return __size;
 121         }
 122       return npos;
 123     }
 124
 125   template<typename _CharT, typename _Traits>
 126     constexpr typename basic_string_view<_CharT, _Traits>::size_type
 127     basic_string_view<_CharT, _Traits>::
 128     find_first_of(const _CharT* __str, size_type __pos, size_type __n) const
 129     {
 130       __glibcxx_requires_string_len(__str, __n);
 131       for (; __n && __pos < this->_M_len; ++__pos)
 132         {
 133           const _CharT* __p = traits_type::find(__str, __n,
 134                                                 this->_M_str[__pos]);
 135           if (__p)
 136             return __pos;
 137         }
 138       return npos;
 139     }
 140
 141   template<typename _CharT, typename _Traits>
 142     constexpr typename basic_string_view<_CharT, _Traits>::size_type
 143     basic_string_view<_CharT, _Traits>::
 144     find_last_of(const _CharT* __str, size_type __pos, size_type __n) const
 145     {
 146       __glibcxx_requires_string_len(__str, __n);
 147       size_type __size = this->size();
 148       if (__size && __n)
 149         {
 150           if (--__size > __pos)
 151             __size = __pos;
 152           do
 153             {
 154               if (traits_type::find(__str, __n, this->_M_str[__size]))
 155                 return __size;
 156             }
 157           while (__size-- != 0);
 158         }
 159       return npos;
 160     }
 161
 162   template<typename _CharT, typename _Traits>
 163     constexpr typename basic_string_view<_CharT, _Traits>::size_type
 164     basic_string_view<_CharT, _Traits>::
 165     find_first_not_of(const _CharT* __str, size_type __pos, size_type __n) const
 166     {
 167       __glibcxx_requires_string_len(__str, __n);
 168       for (; __pos < this->_M_len; ++__pos)
 169         if (!traits_type::find(__str, __n, this->_M_str[__pos]))
 170           return __pos;
 171       return npos;
 172     }
 173
 174   template<typename _CharT, typename _Traits>
 175     constexpr typename basic_string_view<_CharT, _Traits>::size_type
 176     basic_string_view<_CharT, _Traits>::
 177     find_first_not_of(_CharT __c, size_type __pos) const noexcept
 178     {
 179       for (; __pos < this->_M_len; ++__pos)
 180         if (!traits_type::eq(this->_M_str[__pos], __c))
 181           return __pos;
 182       return npos;
 183     }
 184
 185   template<typename _CharT, typename _Traits>
 186     constexpr typename basic_string_view<_CharT, _Traits>::size_type
 187     basic_string_view<_CharT, _Traits>::
 188     find_last_not_of(const _CharT* __str, size_type __pos, size_type __n) const
 189     {
 190       __glibcxx_requires_string_len(__str, __n);
 191       size_type __size = this->_M_len;
 192       if (__size)
 193         {
 194           if (--__size > __pos)
 195             __size = __pos;
 196           do
 197             {
 198               if (!traits_type::find(__str, __n, this->_M_str[__size]))
 199                 return __size;
 200             }
 201           while (__size--);
 202         }
 203       return npos;
 204     }
 205
 206   template<typename _CharT, typename _Traits>
 207     constexpr typename basic_string_view<_CharT, _Traits>::size_type
 208     basic_string_view<_CharT, _Traits>::
 209     find_last_not_of(_CharT __c, size_type __pos) const noexcept
 210     {
 211       size_type __size = this->_M_len;
 212       if (__size)
 213         {
 214           if (--__size > __pos)
 215             __size = __pos;
 216           do
 217             {
 218               if (!traits_type::eq(this->_M_str[__size], __c))
 219                 return __size;
 220             }
 221           while (__size--);
 222         }
 223       return npos;
 224     }
 225 } // namespace fundamentals_v1
 226 } // namespace experimental
 227
 228 _GLIBCXX_END_NAMESPACE_VERSION
 229 } // namespace std
 230
 231 #endif // __cplusplus <= 201103L
 232
 233 #endif // _GLIBCXX_EXPERIMENTAL_STRING_VIEW_TCC