libstdc++
string_view
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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 experimental/string_view
00026  *  This is a TS C++ Library header.
00027  */
00028 
00029 //
00030 // N3762 basic_string_view library
00031 //
00032 
00033 #ifndef _GLIBCXX_EXPERIMENTAL_STRING_VIEW
00034 #define _GLIBCXX_EXPERIMENTAL_STRING_VIEW 1
00035 
00036 #pragma GCC system_header
00037 
00038 #if __cplusplus >= 201402L
00039 
00040 #include <string>
00041 #include <limits>
00042 #include <experimental/bits/lfts_config.h>
00043 
00044 namespace std _GLIBCXX_VISIBILITY(default)
00045 {
00046 _GLIBCXX_BEGIN_NAMESPACE_VERSION
00047 
00048 namespace experimental
00049 {
00050 inline namespace fundamentals_v1
00051 {
00052 #define __cpp_lib_experimental_string_view 201411
00053 
00054   /**
00055    *  @class basic_string_view <experimental/string_view>
00056    *  @brief  A non-owning reference to a string.
00057    *
00058    *  @ingroup strings
00059    *  @ingroup sequences
00060    *  @ingroup experimental
00061    *
00062    *  @tparam _CharT  Type of character
00063    *  @tparam _Traits  Traits for character type, defaults to
00064    *                   char_traits<_CharT>.
00065    *
00066    *  A basic_string_view looks like this:
00067    *
00068    *  @code
00069    *    _CharT*    _M_str
00070    *    size_t     _M_len
00071    *  @endcode
00072    */
00073   template<typename _CharT, typename _Traits = std::char_traits<_CharT>>
00074     class basic_string_view
00075     {
00076     public:
00077 
00078       // types
00079       using traits_type = _Traits;
00080       using value_type = _CharT;
00081       using pointer = const _CharT*;
00082       using const_pointer = const _CharT*;
00083       using reference = const _CharT&;
00084       using const_reference = const _CharT&;
00085       using const_iterator = const _CharT*;
00086       using iterator = const_iterator;
00087       using const_reverse_iterator = std::reverse_iterator<const_iterator>;
00088       using reverse_iterator = const_reverse_iterator;
00089       using size_type = size_t;
00090       using difference_type = ptrdiff_t;
00091       static constexpr size_type npos = size_type(-1);
00092 
00093       // [string.view.cons], construct/copy
00094 
00095       constexpr
00096       basic_string_view() noexcept
00097       : _M_len{0}, _M_str{nullptr}
00098       { }
00099 
00100       constexpr basic_string_view(const basic_string_view&) noexcept = default;
00101 
00102       template<typename _Allocator>
00103         basic_string_view(const basic_string<_CharT, _Traits,
00104                           _Allocator>& __str) noexcept
00105         : _M_len{__str.length()}, _M_str{__str.data()}
00106         { }
00107 
00108       constexpr basic_string_view(const _CharT* __str)
00109       : _M_len{__str == nullptr ? 0 : traits_type::length(__str)},
00110         _M_str{__str}
00111       { }
00112 
00113       constexpr basic_string_view(const _CharT* __str, size_type __len)
00114       : _M_len{__len},
00115         _M_str{__str}
00116       { }
00117 
00118       basic_string_view&
00119       operator=(const basic_string_view&) noexcept = default;
00120 
00121       // [string.view.iterators], iterators
00122 
00123       constexpr const_iterator
00124       begin() const noexcept
00125       { return this->_M_str; }
00126 
00127       constexpr const_iterator
00128       end() const noexcept
00129       { return this->_M_str + this->_M_len; }
00130 
00131       constexpr const_iterator
00132       cbegin() const noexcept
00133       { return this->_M_str; }
00134 
00135       constexpr const_iterator
00136       cend() const noexcept
00137       { return this->_M_str + this->_M_len; }
00138 
00139       const_reverse_iterator
00140       rbegin() const noexcept
00141       { return const_reverse_iterator(this->end()); }
00142 
00143       const_reverse_iterator
00144       rend() const noexcept
00145       { return const_reverse_iterator(this->begin()); }
00146 
00147       const_reverse_iterator
00148       crbegin() const noexcept
00149       { return const_reverse_iterator(this->end()); }
00150 
00151       const_reverse_iterator
00152       crend() const noexcept
00153       { return const_reverse_iterator(this->begin()); }
00154 
00155       // [string.view.capacity], capacity
00156 
00157       constexpr size_type
00158       size() const noexcept
00159       { return this->_M_len; }
00160 
00161       constexpr size_type
00162       length() const noexcept
00163       { return _M_len; }
00164 
00165       constexpr size_type
00166       max_size() const noexcept
00167       {
00168         return (npos - sizeof(size_type) - sizeof(void*))
00169                 / sizeof(value_type) / 4;
00170       }
00171 
00172       constexpr bool
00173       empty() const noexcept
00174       { return this->_M_len == 0; }
00175 
00176       // [string.view.access], element access
00177 
00178       constexpr const _CharT&
00179       operator[](size_type __pos) const
00180       {
00181         // TODO: Assert to restore in a way compatible with the constexpr.
00182         // __glibcxx_assert(__pos < this->_M_len);
00183         return *(this->_M_str + __pos);
00184       }
00185 
00186       constexpr const _CharT&
00187       at(size_type __pos) const
00188       {
00189         return __pos < this->_M_len
00190              ? *(this->_M_str + __pos)
00191              : (__throw_out_of_range_fmt(__N("basic_string_view::at: __pos "
00192                                              "(which is %zu) >= this->size() "
00193                                              "(which is %zu)"),
00194                                          __pos, this->size()),
00195                 *this->_M_str);
00196       }
00197 
00198       constexpr const _CharT&
00199       front() const
00200       {
00201         // TODO: Assert to restore in a way compatible with the constexpr.
00202         // __glibcxx_assert(this->_M_len > 0);
00203         return *this->_M_str;
00204       }
00205 
00206       constexpr const _CharT&
00207       back() const
00208       {
00209         // TODO: Assert to restore in a way compatible with the constexpr.
00210         // __glibcxx_assert(this->_M_len > 0);
00211         return *(this->_M_str + this->_M_len - 1);
00212       }
00213 
00214       constexpr const _CharT*
00215       data() const noexcept
00216       { return this->_M_str; }
00217 
00218       // [string.view.modifiers], modifiers:
00219 
00220       constexpr void
00221       remove_prefix(size_type __n)
00222       {
00223         __glibcxx_assert(this->_M_len >= __n);
00224         this->_M_str += __n;
00225         this->_M_len -= __n;
00226       }
00227 
00228       constexpr void
00229       remove_suffix(size_type __n)
00230       { this->_M_len -= __n; }
00231 
00232       constexpr void
00233       swap(basic_string_view& __sv) noexcept
00234       {
00235         auto __tmp = *this;
00236         *this = __sv;
00237         __sv = __tmp;
00238       }
00239 
00240 
00241       // [string.view.ops], string operations:
00242 
00243       template<typename _Allocator>
00244         explicit operator basic_string<_CharT, _Traits, _Allocator>() const
00245         {
00246           return { this->_M_str, this->_M_len };
00247         }
00248 
00249       template<typename _Allocator = std::allocator<_CharT>>
00250         basic_string<_CharT, _Traits, _Allocator>
00251         to_string(const _Allocator& __alloc = _Allocator()) const
00252         {
00253           return { this->_M_str, this->_M_len, __alloc };
00254         }
00255 
00256       size_type
00257       copy(_CharT* __str, size_type __n, size_type __pos = 0) const
00258       {
00259         __glibcxx_requires_string_len(__str, __n);
00260         if (__pos > this->_M_len)
00261           __throw_out_of_range_fmt(__N("basic_string_view::copy: __pos "
00262                                        "(which is %zu) > this->size() "
00263                                        "(which is %zu)"),
00264                                    __pos, this->size());
00265         size_type __rlen{std::min(__n, size_type{this->_M_len  - __pos})};
00266         for (auto __begin = this->_M_str + __pos,
00267              __end = __begin + __rlen; __begin != __end;)
00268           *__str++ = *__begin++;
00269         return __rlen;
00270       }
00271 
00272 
00273       // [string.view.ops], string operations:
00274 
00275       constexpr basic_string_view
00276       substr(size_type __pos = 0, size_type __n = npos) const
00277       {
00278         return __pos <= this->_M_len
00279              ? basic_string_view{this->_M_str + __pos,
00280                                 std::min(__n, size_type{this->_M_len  - __pos})}
00281              : (__throw_out_of_range_fmt(__N("basic_string_view::substr: __pos "
00282                                              "(which is %zu) > this->size() "
00283                                              "(which is %zu)"),
00284                                      __pos, this->size()), basic_string_view{});
00285       }
00286 
00287       constexpr int
00288       compare(basic_string_view __str) const noexcept
00289       {
00290         int __ret = traits_type::compare(this->_M_str, __str._M_str,
00291                                          std::min(this->_M_len, __str._M_len));
00292         if (__ret == 0)
00293           __ret = _S_compare(this->_M_len, __str._M_len);
00294         return __ret;
00295       }
00296 
00297       constexpr int
00298       compare(size_type __pos1, size_type __n1, basic_string_view __str) const
00299       { return this->substr(__pos1, __n1).compare(__str); }
00300 
00301       constexpr int
00302       compare(size_type __pos1, size_type __n1,
00303               basic_string_view __str, size_type __pos2, size_type __n2) const
00304       { return this->substr(__pos1, __n1).compare(__str.substr(__pos2, __n2)); }
00305 
00306       constexpr int
00307       compare(const _CharT* __str) const noexcept
00308       { return this->compare(basic_string_view{__str}); }
00309 
00310       constexpr int
00311       compare(size_type __pos1, size_type __n1, const _CharT* __str) const
00312       { return this->substr(__pos1, __n1).compare(basic_string_view{__str}); }
00313 
00314       constexpr int
00315       compare(size_type __pos1, size_type __n1,
00316               const _CharT* __str, size_type __n2) const
00317       {
00318         return this->substr(__pos1, __n1)
00319                    .compare(basic_string_view(__str, __n2));
00320       }
00321 
00322       constexpr size_type
00323       find(basic_string_view __str, size_type __pos = 0) const noexcept
00324       { return this->find(__str._M_str, __pos, __str._M_len); }
00325 
00326       constexpr size_type
00327       find(_CharT __c, size_type __pos=0) const noexcept;
00328 
00329       constexpr size_type
00330       find(const _CharT* __str, size_type __pos, size_type __n) const noexcept;
00331 
00332       constexpr size_type
00333       find(const _CharT* __str, size_type __pos=0) const noexcept
00334       { return this->find(__str, __pos, traits_type::length(__str)); }
00335 
00336       constexpr size_type
00337       rfind(basic_string_view __str, size_type __pos = npos) const noexcept
00338       { return this->rfind(__str._M_str, __pos, __str._M_len); }
00339 
00340       constexpr size_type
00341       rfind(_CharT __c, size_type __pos = npos) const noexcept;
00342 
00343       constexpr size_type
00344       rfind(const _CharT* __str, size_type __pos, size_type __n) const noexcept;
00345 
00346       constexpr size_type
00347       rfind(const _CharT* __str, size_type __pos = npos) const noexcept
00348       { return this->rfind(__str, __pos, traits_type::length(__str)); }
00349 
00350       constexpr size_type
00351       find_first_of(basic_string_view __str, size_type __pos = 0) const noexcept
00352       { return this->find_first_of(__str._M_str, __pos, __str._M_len); }
00353 
00354       constexpr size_type
00355       find_first_of(_CharT __c, size_type __pos = 0) const noexcept
00356       { return this->find(__c, __pos); }
00357 
00358       constexpr size_type
00359       find_first_of(const _CharT* __str, size_type __pos, size_type __n) const;
00360 
00361       constexpr size_type
00362       find_first_of(const _CharT* __str, size_type __pos = 0) const noexcept
00363       { return this->find_first_of(__str, __pos, traits_type::length(__str)); }
00364 
00365       constexpr size_type
00366       find_last_of(basic_string_view __str,
00367                    size_type __pos = npos) const noexcept
00368       { return this->find_last_of(__str._M_str, __pos, __str._M_len); }
00369 
00370       constexpr size_type
00371       find_last_of(_CharT __c, size_type __pos=npos) const noexcept
00372       { return this->rfind(__c, __pos); }
00373 
00374       constexpr size_type
00375       find_last_of(const _CharT* __str, size_type __pos, size_type __n) const;
00376 
00377       constexpr size_type
00378       find_last_of(const _CharT* __str, size_type __pos = npos) const noexcept
00379       { return this->find_last_of(__str, __pos, traits_type::length(__str)); }
00380 
00381       constexpr size_type
00382       find_first_not_of(basic_string_view __str,
00383                         size_type __pos = 0) const noexcept
00384       { return this->find_first_not_of(__str._M_str, __pos, __str._M_len); }
00385 
00386       constexpr size_type
00387       find_first_not_of(_CharT __c, size_type __pos = 0) const noexcept;
00388 
00389       constexpr size_type
00390       find_first_not_of(const _CharT* __str,
00391                         size_type __pos, size_type __n) const;
00392 
00393       constexpr size_type
00394       find_first_not_of(const _CharT* __str, size_type __pos = 0) const noexcept
00395       {
00396         return this->find_first_not_of(__str, __pos,
00397                                        traits_type::length(__str));
00398       }
00399 
00400       constexpr size_type
00401       find_last_not_of(basic_string_view __str,
00402                        size_type __pos = npos) const noexcept
00403       { return this->find_last_not_of(__str._M_str, __pos, __str._M_len); }
00404 
00405       constexpr size_type
00406       find_last_not_of(_CharT __c, size_type __pos = npos) const noexcept;
00407 
00408       constexpr size_type
00409       find_last_not_of(const _CharT* __str,
00410                        size_type __pos, size_type __n) const;
00411 
00412       constexpr size_type
00413       find_last_not_of(const _CharT* __str,
00414                        size_type __pos = npos) const noexcept
00415       {
00416         return this->find_last_not_of(__str, __pos,
00417                                       traits_type::length(__str));
00418       }
00419 
00420     private:
00421 
00422       static constexpr int
00423       _S_compare(size_type __n1, size_type __n2) noexcept
00424       {
00425         return difference_type(__n1 - __n2) > std::numeric_limits<int>::max()
00426              ? std::numeric_limits<int>::max()
00427              : difference_type(__n1 - __n2) < std::numeric_limits<int>::min()
00428              ? std::numeric_limits<int>::min()
00429              : static_cast<int>(difference_type(__n1 - __n2));
00430       }
00431 
00432       size_t        _M_len;
00433       const _CharT* _M_str;
00434     };
00435 
00436   // [string.view.comparison], non-member basic_string_view comparison functions
00437 
00438   namespace __detail
00439   {
00440     // Identity transform to create a non-deduced context, so that only one
00441     // argument participates in template argument deduction and the other
00442     // argument gets implicitly converted to the deduced type. See n3766.html.
00443     template<typename _Tp>
00444       using __idt = common_type_t<_Tp>;
00445   }
00446 
00447   template<typename _CharT, typename _Traits>
00448     constexpr bool
00449     operator==(basic_string_view<_CharT, _Traits> __x,
00450                basic_string_view<_CharT, _Traits> __y) noexcept
00451     { return __x.size() == __y.size() && __x.compare(__y) == 0; }
00452 
00453   template<typename _CharT, typename _Traits>
00454     constexpr bool
00455     operator==(basic_string_view<_CharT, _Traits> __x,
00456                __detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
00457     { return __x.size() == __y.size() && __x.compare(__y) == 0; }
00458 
00459   template<typename _CharT, typename _Traits>
00460     constexpr bool
00461     operator==(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
00462                basic_string_view<_CharT, _Traits> __y) noexcept
00463     { return __x.size() == __y.size() && __x.compare(__y) == 0; }
00464 
00465   template<typename _CharT, typename _Traits>
00466     constexpr bool
00467     operator!=(basic_string_view<_CharT, _Traits> __x,
00468                basic_string_view<_CharT, _Traits> __y) noexcept
00469     { return !(__x == __y); }
00470 
00471   template<typename _CharT, typename _Traits>
00472     constexpr bool
00473     operator!=(basic_string_view<_CharT, _Traits> __x,
00474                __detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
00475     { return !(__x == __y); }
00476 
00477   template<typename _CharT, typename _Traits>
00478     constexpr bool
00479     operator!=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
00480                basic_string_view<_CharT, _Traits> __y) noexcept
00481     { return !(__x == __y); }
00482 
00483   template<typename _CharT, typename _Traits>
00484     constexpr bool
00485     operator< (basic_string_view<_CharT, _Traits> __x,
00486                basic_string_view<_CharT, _Traits> __y) noexcept
00487     { return __x.compare(__y) < 0; }
00488 
00489   template<typename _CharT, typename _Traits>
00490     constexpr bool
00491     operator< (basic_string_view<_CharT, _Traits> __x,
00492                __detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
00493     { return __x.compare(__y) < 0; }
00494 
00495   template<typename _CharT, typename _Traits>
00496     constexpr bool
00497     operator< (__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
00498                basic_string_view<_CharT, _Traits> __y) noexcept
00499     { return __x.compare(__y) < 0; }
00500 
00501   template<typename _CharT, typename _Traits>
00502     constexpr bool
00503     operator> (basic_string_view<_CharT, _Traits> __x,
00504                basic_string_view<_CharT, _Traits> __y) noexcept
00505     { return __x.compare(__y) > 0; }
00506 
00507   template<typename _CharT, typename _Traits>
00508     constexpr bool
00509     operator> (basic_string_view<_CharT, _Traits> __x,
00510                __detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
00511     { return __x.compare(__y) > 0; }
00512 
00513   template<typename _CharT, typename _Traits>
00514     constexpr bool
00515     operator> (__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
00516                basic_string_view<_CharT, _Traits> __y) noexcept
00517     { return __x.compare(__y) > 0; }
00518 
00519   template<typename _CharT, typename _Traits>
00520     constexpr bool
00521     operator<=(basic_string_view<_CharT, _Traits> __x,
00522                basic_string_view<_CharT, _Traits> __y) noexcept
00523     { return __x.compare(__y) <= 0; }
00524 
00525   template<typename _CharT, typename _Traits>
00526     constexpr bool
00527     operator<=(basic_string_view<_CharT, _Traits> __x,
00528                __detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
00529     { return __x.compare(__y) <= 0; }
00530 
00531   template<typename _CharT, typename _Traits>
00532     constexpr bool
00533     operator<=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
00534                basic_string_view<_CharT, _Traits> __y) noexcept
00535     { return __x.compare(__y) <= 0; }
00536 
00537   template<typename _CharT, typename _Traits>
00538     constexpr bool
00539     operator>=(basic_string_view<_CharT, _Traits> __x,
00540                basic_string_view<_CharT, _Traits> __y) noexcept
00541     { return __x.compare(__y) >= 0; }
00542 
00543   template<typename _CharT, typename _Traits>
00544     constexpr bool
00545     operator>=(basic_string_view<_CharT, _Traits> __x,
00546                __detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
00547     { return __x.compare(__y) >= 0; }
00548 
00549   template<typename _CharT, typename _Traits>
00550     constexpr bool
00551     operator>=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
00552                basic_string_view<_CharT, _Traits> __y) noexcept
00553     { return __x.compare(__y) >= 0; }
00554 
00555   // [string.view.io], Inserters and extractors
00556   template<typename _CharT, typename _Traits>
00557     inline basic_ostream<_CharT, _Traits>&
00558     operator<<(basic_ostream<_CharT, _Traits>& __os,
00559                basic_string_view<_CharT,_Traits> __str)
00560     { return __ostream_insert(__os, __str.data(), __str.size()); }
00561 
00562 
00563   // basic_string_view typedef names
00564 
00565   using string_view = basic_string_view<char>;
00566 #ifdef _GLIBCXX_USE_WCHAR_T
00567   using wstring_view = basic_string_view<wchar_t>;
00568 #endif
00569 #ifdef _GLIBCXX_USE_C99_STDINT_TR1
00570   using u16string_view = basic_string_view<char16_t>;
00571   using u32string_view = basic_string_view<char32_t>;
00572 #endif
00573 } // namespace fundamentals_v1
00574 } // namespace experimental
00575 
00576 
00577   // [string.view.hash], hash support:
00578   template<typename _Tp>
00579     struct hash;
00580 
00581   template<>
00582     struct hash<experimental::string_view>
00583     : public __hash_base<size_t, experimental::string_view>
00584     {
00585       size_t
00586       operator()(const experimental::string_view& __str) const noexcept
00587       { return std::_Hash_impl::hash(__str.data(), __str.length()); }
00588     };
00589 
00590   template<>
00591     struct __is_fast_hash<hash<experimental::string_view>> : std::false_type
00592     { };
00593 
00594 #ifdef _GLIBCXX_USE_WCHAR_T
00595   template<>
00596     struct hash<experimental::wstring_view>
00597     : public __hash_base<size_t, wstring>
00598     {
00599       size_t
00600       operator()(const experimental::wstring_view& __s) const noexcept
00601       { return std::_Hash_impl::hash(__s.data(),
00602                                      __s.length() * sizeof(wchar_t)); }
00603     };
00604 
00605   template<>
00606     struct __is_fast_hash<hash<experimental::wstring_view>> : std::false_type
00607     { };
00608 #endif
00609 
00610 #ifdef _GLIBCXX_USE_C99_STDINT_TR1
00611   template<>
00612     struct hash<experimental::u16string_view>
00613     : public __hash_base<size_t, experimental::u16string_view>
00614     {
00615       size_t
00616       operator()(const experimental::u16string_view& __s) const noexcept
00617       { return std::_Hash_impl::hash(__s.data(),
00618                                      __s.length() * sizeof(char16_t)); }
00619     };
00620 
00621   template<>
00622     struct __is_fast_hash<hash<experimental::u16string_view>> : std::false_type
00623     { };
00624 
00625   template<>
00626     struct hash<experimental::u32string_view>
00627     : public __hash_base<size_t, experimental::u32string_view>
00628     {
00629       size_t
00630       operator()(const experimental::u32string_view& __s) const noexcept
00631       { return std::_Hash_impl::hash(__s.data(),
00632                                      __s.length() * sizeof(char32_t)); }
00633     };
00634 
00635   template<>
00636     struct __is_fast_hash<hash<experimental::u32string_view>> : std::false_type
00637     { };
00638 #endif
00639 
00640 namespace experimental
00641 {
00642   // I added these EMSR.
00643   inline namespace literals
00644   {
00645   inline namespace string_view_literals
00646   {
00647 #pragma GCC diagnostic push
00648 #pragma GCC diagnostic ignored "-Wliteral-suffix"
00649     inline constexpr basic_string_view<char>
00650     operator""sv(const char* __str, size_t __len) noexcept
00651     { return basic_string_view<char>{__str, __len}; }
00652 
00653 #ifdef _GLIBCXX_USE_WCHAR_T
00654     inline constexpr basic_string_view<wchar_t>
00655     operator""sv(const wchar_t* __str, size_t __len) noexcept
00656     { return basic_string_view<wchar_t>{__str, __len}; }
00657 #endif
00658 
00659 #ifdef _GLIBCXX_USE_C99_STDINT_TR1
00660     inline constexpr basic_string_view<char16_t>
00661     operator""sv(const char16_t* __str, size_t __len) noexcept
00662     { return basic_string_view<char16_t>{__str, __len}; }
00663 
00664     inline constexpr basic_string_view<char32_t>
00665     operator""sv(const char32_t* __str, size_t __len) noexcept
00666     { return basic_string_view<char32_t>{__str, __len}; }
00667 #endif
00668 #pragma GCC diagnostic pop
00669   } // namespace string_literals
00670   } // namespace literals
00671 } // namespace experimental
00672 
00673 _GLIBCXX_END_NAMESPACE_VERSION
00674 } // namespace std
00675 
00676 #include <experimental/bits/string_view.tcc>
00677 
00678 #endif // __cplusplus <= 201103L
00679 
00680 #endif // _GLIBCXX_EXPERIMENTAL_STRING_VIEW