libstdc++
string_view.tcc
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00001 // Components for manipulating non-owning sequences of characters -*- C++ -*-
00002 
00003 // Copyright (C) 2013-2018 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 3, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // Under Section 7 of GPL version 3, you are granted additional
00017 // permissions described in the GCC Runtime Library Exception, version
00018 // 3.1, as published by the Free Software Foundation.
00019 
00020 // You should have received a copy of the GNU General Public License and
00021 // a copy of the GCC Runtime Library Exception along with this program;
00022 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
00023 // <http://www.gnu.org/licenses/>.
00024 
00025 /** @file include/bits/string_view.tcc
00026  *  This is an internal header file, included by other library headers.
00027  *  Do not attempt to use it directly. @headername{string_view}
00028  */
00029 
00030 //
00031 // N3762 basic_string_view library
00032 //
00033 
00034 #ifndef _GLIBCXX_STRING_VIEW_TCC
00035 #define _GLIBCXX_STRING_VIEW_TCC 1
00036 
00037 #pragma GCC system_header
00038 
00039 #if __cplusplus >= 201703L
00040 
00041 namespace std _GLIBCXX_VISIBILITY(default)
00042 {
00043 _GLIBCXX_BEGIN_NAMESPACE_VERSION
00044 
00045   template<typename _CharT, typename _Traits>
00046     constexpr typename basic_string_view<_CharT, _Traits>::size_type
00047     basic_string_view<_CharT, _Traits>::
00048     find(const _CharT* __str, size_type __pos, size_type __n) const noexcept
00049     {
00050       __glibcxx_requires_string_len(__str, __n);
00051 
00052       if (__n == 0)
00053         return __pos <= this->_M_len ? __pos : npos;
00054 
00055       if (__n <= this->_M_len)
00056         {
00057           for (; __pos <= this->_M_len - __n; ++__pos)
00058             if (traits_type::eq(this->_M_str[__pos], __str[0])
00059                 && traits_type::compare(this->_M_str + __pos + 1,
00060                                         __str + 1, __n - 1) == 0)
00061               return __pos;
00062         }
00063       return npos;
00064     }
00065 
00066   template<typename _CharT, typename _Traits>
00067     constexpr typename basic_string_view<_CharT, _Traits>::size_type
00068     basic_string_view<_CharT, _Traits>::
00069     find(_CharT __c, size_type __pos) const noexcept
00070     {
00071       size_type __ret = npos;
00072       if (__pos < this->_M_len)
00073         {
00074           const size_type __n = this->_M_len - __pos;
00075           const _CharT* __p = traits_type::find(this->_M_str + __pos, __n, __c);
00076           if (__p)
00077             __ret = __p - this->_M_str;
00078         }
00079       return __ret;
00080     }
00081 
00082   template<typename _CharT, typename _Traits>
00083     constexpr typename basic_string_view<_CharT, _Traits>::size_type
00084     basic_string_view<_CharT, _Traits>::
00085     rfind(const _CharT* __str, size_type __pos, size_type __n) const noexcept
00086     {
00087       __glibcxx_requires_string_len(__str, __n);
00088 
00089       if (__n <= this->_M_len)
00090         {
00091           __pos = std::min(size_type(this->_M_len - __n), __pos);
00092           do
00093             {
00094               if (traits_type::compare(this->_M_str + __pos, __str, __n) == 0)
00095                 return __pos;
00096             }
00097           while (__pos-- > 0);
00098         }
00099       return npos;
00100     }
00101 
00102   template<typename _CharT, typename _Traits>
00103     constexpr typename basic_string_view<_CharT, _Traits>::size_type
00104     basic_string_view<_CharT, _Traits>::
00105     rfind(_CharT __c, size_type __pos) const noexcept
00106     {
00107       size_type __size = this->_M_len;
00108       if (__size > 0)
00109         {
00110           if (--__size > __pos)
00111             __size = __pos;
00112           for (++__size; __size-- > 0; )
00113             if (traits_type::eq(this->_M_str[__size], __c))
00114               return __size;
00115         }
00116       return npos;
00117     }
00118 
00119   template<typename _CharT, typename _Traits>
00120     constexpr typename basic_string_view<_CharT, _Traits>::size_type
00121     basic_string_view<_CharT, _Traits>::
00122     find_first_of(const _CharT* __str, size_type __pos,
00123                   size_type __n) const noexcept
00124     {
00125       __glibcxx_requires_string_len(__str, __n);
00126       for (; __n && __pos < this->_M_len; ++__pos)
00127         {
00128           const _CharT* __p = traits_type::find(__str, __n,
00129                                                 this->_M_str[__pos]);
00130           if (__p)
00131             return __pos;
00132         }
00133       return npos;
00134     }
00135 
00136   template<typename _CharT, typename _Traits>
00137     constexpr typename basic_string_view<_CharT, _Traits>::size_type
00138     basic_string_view<_CharT, _Traits>::
00139     find_last_of(const _CharT* __str, size_type __pos,
00140                  size_type __n) const noexcept
00141     {
00142       __glibcxx_requires_string_len(__str, __n);
00143       size_type __size = this->size();
00144       if (__size && __n)
00145         {
00146           if (--__size > __pos)
00147             __size = __pos;
00148           do
00149             {
00150               if (traits_type::find(__str, __n, this->_M_str[__size]))
00151                 return __size;
00152             }
00153           while (__size-- != 0);
00154         }
00155       return npos;
00156     }
00157 
00158   template<typename _CharT, typename _Traits>
00159     constexpr typename basic_string_view<_CharT, _Traits>::size_type
00160     basic_string_view<_CharT, _Traits>::
00161     find_first_not_of(const _CharT* __str, size_type __pos,
00162                       size_type __n) const noexcept
00163     {
00164       __glibcxx_requires_string_len(__str, __n);
00165       for (; __pos < this->_M_len; ++__pos)
00166         if (!traits_type::find(__str, __n, this->_M_str[__pos]))
00167           return __pos;
00168       return npos;
00169     }
00170 
00171   template<typename _CharT, typename _Traits>
00172     constexpr typename basic_string_view<_CharT, _Traits>::size_type
00173     basic_string_view<_CharT, _Traits>::
00174     find_first_not_of(_CharT __c, size_type __pos) const noexcept
00175     {
00176       for (; __pos < this->_M_len; ++__pos)
00177         if (!traits_type::eq(this->_M_str[__pos], __c))
00178           return __pos;
00179       return npos;
00180     }
00181 
00182   template<typename _CharT, typename _Traits>
00183     constexpr typename basic_string_view<_CharT, _Traits>::size_type
00184     basic_string_view<_CharT, _Traits>::
00185     find_last_not_of(const _CharT* __str, size_type __pos,
00186                      size_type __n) const noexcept
00187     {
00188       __glibcxx_requires_string_len(__str, __n);
00189       size_type __size = this->_M_len;
00190       if (__size)
00191         {
00192           if (--__size > __pos)
00193             __size = __pos;
00194           do
00195             {
00196               if (!traits_type::find(__str, __n, this->_M_str[__size]))
00197                 return __size;
00198             }
00199           while (__size--);
00200         }
00201       return npos;
00202     }
00203 
00204   template<typename _CharT, typename _Traits>
00205     constexpr typename basic_string_view<_CharT, _Traits>::size_type
00206     basic_string_view<_CharT, _Traits>::
00207     find_last_not_of(_CharT __c, size_type __pos) const noexcept
00208     {
00209       size_type __size = this->_M_len;
00210       if (__size)
00211         {
00212           if (--__size > __pos)
00213             __size = __pos;
00214           do
00215             {
00216               if (!traits_type::eq(this->_M_str[__size], __c))
00217                 return __size;
00218             }
00219           while (__size--);
00220         }
00221       return npos;
00222     }
00223 
00224 _GLIBCXX_END_NAMESPACE_VERSION
00225 } // namespace std
00226 
00227 #endif // __cplusplus <= 201402L
00228 
00229 #endif // _GLIBCXX_STRING_VIEW_TCC