33 #ifndef _GLIBCXX_STRING_VIEW
34 #define _GLIBCXX_STRING_VIEW 1
36 #pragma GCC system_header
38 #if __cplusplus >= 201703L
47 #if __cplusplus >= 202002L
51 namespace std _GLIBCXX_VISIBILITY(default)
53 _GLIBCXX_BEGIN_NAMESPACE_VERSION
55 # define __cpp_lib_string_view 201803L
56 #if __cplusplus > 201703L
57 # define __cpp_lib_constexpr_string_view 201811L
62 __sv_check(
size_t __size,
size_t __pos,
const char* __s)
65 __throw_out_of_range_fmt(__N(
"%s: __pos (which is %zu) > __size "
66 "(which is %zu)"), __s, __pos, __size);
73 __sv_limit(
size_t __size,
size_t __pos,
size_t __off) noexcept
75 const bool __testoff = __off < __size - __pos;
76 return __testoff ? __off : __size - __pos;
97 template<
typename _CharT,
typename _Traits = std::
char_traits<_CharT>>
100 static_assert(!is_array_v<_CharT>);
101 static_assert(is_trivial_v<_CharT> && is_standard_layout_v<_CharT>);
102 static_assert(is_same_v<_CharT, typename _Traits::char_type>);
107 using traits_type = _Traits;
108 using value_type = _CharT;
109 using pointer = value_type*;
110 using const_pointer =
const value_type*;
111 using reference = value_type&;
112 using const_reference =
const value_type&;
113 using const_iterator =
const value_type*;
114 using iterator = const_iterator;
117 using size_type = size_t;
118 using difference_type = ptrdiff_t;
119 static constexpr size_type npos = size_type(-1);
125 : _M_len{0}, _M_str{
nullptr}
130 __attribute__((__nonnull__)) constexpr
132 : _M_len{traits_type::length(__str)},
138 : _M_len{__len}, _M_str{__str}
141 #if __cplusplus >= 202002L && __cpp_lib_concepts
142 template<contiguous_iterator _It, sized_sentinel_for<_It> _End>
143 requires same_as<iter_value_t<_It>, _CharT>
144 && (!convertible_to<_End, size_type>)
147 : _M_len(__last - __first), _M_str(std::to_address(__first))
150 #if __cplusplus > 202002L
151 template<
typename _Range,
typename _DRange = remove_cvref_t<_Range>>
152 requires (!is_same_v<_DRange, basic_string_view>)
153 && ranges::contiguous_range<_Range>
154 && ranges::sized_range<_Range>
155 && is_same_v<ranges::range_value_t<_Range>, _CharT>
156 && (!is_convertible_v<_Range, const _CharT*>)
157 && (!requires (_DRange& __d) {
158 __d.operator ::std::basic_string_view<_CharT, _Traits>();
160 && (!requires {
typename _DRange::traits_type; }
161 || is_same_v<typename _DRange::traits_type, _Traits>)
175 constexpr const_iterator
176 begin()
const noexcept
177 {
return this->_M_str; }
179 constexpr const_iterator
181 {
return this->_M_str + this->_M_len; }
183 constexpr const_iterator
184 cbegin()
const noexcept
185 {
return this->_M_str; }
187 constexpr const_iterator
188 cend()
const noexcept
189 {
return this->_M_str + this->_M_len; }
192 rbegin()
const noexcept
196 rend()
const noexcept
200 crbegin()
const noexcept
204 crend()
const noexcept
210 size()
const noexcept
211 {
return this->_M_len; }
214 length()
const noexcept
218 max_size()
const noexcept
220 return (npos -
sizeof(size_type) -
sizeof(
void*))
221 /
sizeof(value_type) / 4;
224 [[nodiscard]] constexpr
bool
225 empty()
const noexcept
226 {
return this->_M_len == 0; }
230 constexpr const_reference
231 operator[](size_type __pos)
const noexcept
233 __glibcxx_assert(__pos < this->_M_len);
234 return *(this->_M_str + __pos);
237 constexpr const_reference
238 at(size_type __pos)
const
241 __throw_out_of_range_fmt(__N(
"basic_string_view::at: __pos "
242 "(which is %zu) >= this->size() "
243 "(which is %zu)"), __pos, this->size());
244 return *(this->_M_str + __pos);
247 constexpr const_reference
248 front()
const noexcept
250 __glibcxx_assert(this->_M_len > 0);
251 return *this->_M_str;
254 constexpr const_reference
255 back()
const noexcept
257 __glibcxx_assert(this->_M_len > 0);
258 return *(this->_M_str + this->_M_len - 1);
261 constexpr const_pointer
262 data()
const noexcept
263 {
return this->_M_str; }
268 remove_prefix(size_type __n) noexcept
270 __glibcxx_assert(this->_M_len >= __n);
276 remove_suffix(size_type __n) noexcept
277 { this->_M_len -= __n; }
291 copy(_CharT* __str, size_type __n, size_type __pos = 0)
const
293 __glibcxx_requires_string_len(__str, __n);
294 __pos = std::__sv_check(size(), __pos,
"basic_string_view::copy");
295 const size_type __rlen =
std::min(__n, _M_len - __pos);
298 traits_type::copy(__str, data() + __pos, __rlen);
303 substr(size_type __pos = 0, size_type __n = npos)
const noexcept(
false)
305 __pos = std::__sv_check(size(), __pos,
"basic_string_view::substr");
306 const size_type __rlen =
std::min(__n, _M_len - __pos);
313 const size_type __rlen =
std::min(this->_M_len, __str._M_len);
314 int __ret = traits_type::compare(this->_M_str, __str._M_str, __rlen);
316 __ret = _S_compare(this->_M_len, __str._M_len);
322 {
return this->substr(__pos1, __n1).compare(__str); }
325 compare(size_type __pos1, size_type __n1,
328 return this->substr(__pos1, __n1).compare(__str.substr(__pos2, __n2));
331 __attribute__((__nonnull__)) constexpr
int
332 compare(
const _CharT* __str)
const noexcept
335 __attribute__((__nonnull__)) constexpr
int
336 compare(size_type __pos1, size_type __n1,
const _CharT* __str)
const
340 compare(size_type __pos1, size_type __n1,
341 const _CharT* __str, size_type __n2)
const noexcept(
false)
343 return this->substr(__pos1, __n1)
347 #if __cplusplus > 201703L
348 #define __cpp_lib_starts_ends_with 201711L
351 {
return this->substr(0, __x.size()) == __x; }
354 starts_with(_CharT __x)
const noexcept
355 {
return !this->empty() && traits_type::eq(this->front(), __x); }
358 starts_with(
const _CharT* __x)
const noexcept
364 const auto __len = this->size();
365 const auto __xlen = __x.size();
366 return __len >= __xlen
367 && traits_type::compare(end() - __xlen, __x.data(), __xlen) == 0;
371 ends_with(_CharT __x)
const noexcept
372 {
return !this->empty() && traits_type::eq(this->back(), __x); }
375 ends_with(
const _CharT* __x)
const noexcept
379 #if __cplusplus > 202002L
380 #define __cpp_lib_string_contains 202011L
383 {
return this->find(__x) != npos; }
386 contains(_CharT __x)
const noexcept
387 {
return this->find(__x) != npos; }
390 contains(
const _CharT* __x)
const noexcept
391 {
return this->find(__x) != npos; }
398 {
return this->find(__str._M_str, __pos, __str._M_len); }
401 find(_CharT __c, size_type __pos = 0)
const noexcept;
404 find(
const _CharT* __str, size_type __pos, size_type __n)
const noexcept;
406 __attribute__((__nonnull__)) constexpr size_type
407 find(
const _CharT* __str, size_type __pos = 0)
const noexcept
408 {
return this->find(__str, __pos, traits_type::length(__str)); }
412 {
return this->rfind(__str._M_str, __pos, __str._M_len); }
415 rfind(_CharT __c, size_type __pos = npos)
const noexcept;
418 rfind(
const _CharT* __str, size_type __pos, size_type __n)
const noexcept;
420 __attribute__((__nonnull__)) constexpr size_type
421 rfind(
const _CharT* __str, size_type __pos = npos)
const noexcept
422 {
return this->rfind(__str, __pos, traits_type::length(__str)); }
426 {
return this->find_first_of(__str._M_str, __pos, __str._M_len); }
429 find_first_of(_CharT __c, size_type __pos = 0)
const noexcept
430 {
return this->find(__c, __pos); }
433 find_first_of(
const _CharT* __str, size_type __pos,
434 size_type __n)
const noexcept;
436 __attribute__((__nonnull__)) constexpr size_type
437 find_first_of(
const _CharT* __str, size_type __pos = 0)
const noexcept
438 {
return this->find_first_of(__str, __pos, traits_type::length(__str)); }
442 size_type __pos = npos)
const noexcept
443 {
return this->find_last_of(__str._M_str, __pos, __str._M_len); }
446 find_last_of(_CharT __c, size_type __pos=npos)
const noexcept
447 {
return this->rfind(__c, __pos); }
450 find_last_of(
const _CharT* __str, size_type __pos,
451 size_type __n)
const noexcept;
453 __attribute__((__nonnull__)) constexpr size_type
454 find_last_of(
const _CharT* __str, size_type __pos = npos)
const noexcept
455 {
return this->find_last_of(__str, __pos, traits_type::length(__str)); }
459 size_type __pos = 0)
const noexcept
460 {
return this->find_first_not_of(__str._M_str, __pos, __str._M_len); }
463 find_first_not_of(_CharT __c, size_type __pos = 0)
const noexcept;
466 find_first_not_of(
const _CharT* __str,
467 size_type __pos, size_type __n)
const noexcept;
469 __attribute__((__nonnull__)) constexpr size_type
470 find_first_not_of(
const _CharT* __str, size_type __pos = 0)
const noexcept
472 return this->find_first_not_of(__str, __pos,
473 traits_type::length(__str));
478 size_type __pos = npos)
const noexcept
479 {
return this->find_last_not_of(__str._M_str, __pos, __str._M_len); }
482 find_last_not_of(_CharT __c, size_type __pos = npos)
const noexcept;
485 find_last_not_of(
const _CharT* __str,
486 size_type __pos, size_type __n)
const noexcept;
488 __attribute__((__nonnull__)) constexpr size_type
489 find_last_not_of(
const _CharT* __str,
490 size_type __pos = npos)
const noexcept
492 return this->find_last_not_of(__str, __pos,
493 traits_type::length(__str));
499 _S_compare(size_type __n1, size_type __n2) noexcept
502 const difference_type __diff = __n1 - __n2;
503 if (__diff > __limits::__max)
504 return __limits::__max;
505 if (__diff < __limits::__min)
506 return __limits::__min;
507 return static_cast<int>(__diff);
511 const _CharT* _M_str;
514 #if __cplusplus > 201703L && __cpp_lib_concepts && __cpp_deduction_guides
515 template<contiguous_iterator _It, sized_sentinel_for<_It> _End>
518 #if __cplusplus > 202002L
519 template<ranges::contiguous_range _Range>
532 template<
typename _CharT,
typename _Traits>
536 {
return __x.size() == __y.size() && __x.compare(__y) == 0; }
538 template<
typename _CharT,
typename _Traits>
540 operator==(basic_string_view<_CharT, _Traits> __x,
541 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
543 {
return __x.size() == __y.size() && __x.compare(__y) == 0; }
545 #if __cpp_lib_three_way_comparison
546 template<
typename _CharT,
typename _Traits>
548 operator<=>(basic_string_view<_CharT, _Traits> __x,
549 basic_string_view<_CharT, _Traits> __y) noexcept
550 -> decltype(__detail::__char_traits_cmp_cat<_Traits>(0))
551 {
return __detail::__char_traits_cmp_cat<_Traits>(__x.compare(__y)); }
553 template<
typename _CharT,
typename _Traits>
555 operator<=>(basic_string_view<_CharT, _Traits> __x,
556 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
558 -> decltype(__detail::__char_traits_cmp_cat<_Traits>(0))
559 {
return __detail::__char_traits_cmp_cat<_Traits>(__x.compare(__y)); }
561 template<
typename _CharT,
typename _Traits>
563 operator==(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
564 basic_string_view<_CharT, _Traits> __y) noexcept
565 {
return __x.size() == __y.size() && __x.compare(__y) == 0; }
567 template<
typename _CharT,
typename _Traits>
569 operator!=(basic_string_view<_CharT, _Traits> __x,
570 basic_string_view<_CharT, _Traits> __y) noexcept
571 {
return !(__x == __y); }
573 template<
typename _CharT,
typename _Traits>
575 operator!=(basic_string_view<_CharT, _Traits> __x,
576 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
578 {
return !(__x == __y); }
580 template<
typename _CharT,
typename _Traits>
582 operator!=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
583 basic_string_view<_CharT, _Traits> __y) noexcept
584 {
return !(__x == __y); }
586 template<
typename _CharT,
typename _Traits>
588 operator< (basic_string_view<_CharT, _Traits> __x,
589 basic_string_view<_CharT, _Traits> __y) noexcept
590 {
return __x.compare(__y) < 0; }
592 template<
typename _CharT,
typename _Traits>
594 operator< (basic_string_view<_CharT, _Traits> __x,
595 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
597 {
return __x.compare(__y) < 0; }
599 template<
typename _CharT,
typename _Traits>
601 operator< (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
602 basic_string_view<_CharT, _Traits> __y) noexcept
603 {
return __x.compare(__y) < 0; }
605 template<
typename _CharT,
typename _Traits>
607 operator> (basic_string_view<_CharT, _Traits> __x,
608 basic_string_view<_CharT, _Traits> __y) noexcept
609 {
return __x.compare(__y) > 0; }
611 template<
typename _CharT,
typename _Traits>
613 operator> (basic_string_view<_CharT, _Traits> __x,
614 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
616 {
return __x.compare(__y) > 0; }
618 template<
typename _CharT,
typename _Traits>
620 operator> (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
621 basic_string_view<_CharT, _Traits> __y) noexcept
622 {
return __x.compare(__y) > 0; }
624 template<
typename _CharT,
typename _Traits>
626 operator<=(basic_string_view<_CharT, _Traits> __x,
627 basic_string_view<_CharT, _Traits> __y) noexcept
628 {
return __x.compare(__y) <= 0; }
630 template<
typename _CharT,
typename _Traits>
632 operator<=(basic_string_view<_CharT, _Traits> __x,
633 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
635 {
return __x.compare(__y) <= 0; }
637 template<
typename _CharT,
typename _Traits>
639 operator<=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
640 basic_string_view<_CharT, _Traits> __y) noexcept
641 {
return __x.compare(__y) <= 0; }
643 template<
typename _CharT,
typename _Traits>
645 operator>=(basic_string_view<_CharT, _Traits> __x,
646 basic_string_view<_CharT, _Traits> __y) noexcept
647 {
return __x.compare(__y) >= 0; }
649 template<
typename _CharT,
typename _Traits>
651 operator>=(basic_string_view<_CharT, _Traits> __x,
652 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
654 {
return __x.compare(__y) >= 0; }
656 template<
typename _CharT,
typename _Traits>
658 operator>=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
659 basic_string_view<_CharT, _Traits> __y) noexcept
660 {
return __x.compare(__y) >= 0; }
661 #endif // three-way comparison
664 template<
typename _CharT,
typename _Traits>
665 inline basic_ostream<_CharT, _Traits>&
666 operator<<(basic_ostream<_CharT, _Traits>& __os,
667 basic_string_view<_CharT,_Traits> __str)
668 {
return __ostream_insert(__os, __str.data(), __str.size()); }
673 using string_view = basic_string_view<char>;
674 #ifdef _GLIBCXX_USE_WCHAR_T
675 using wstring_view = basic_string_view<wchar_t>;
677 #ifdef _GLIBCXX_USE_CHAR8_T
678 using u8string_view = basic_string_view<char8_t>;
680 using u16string_view = basic_string_view<char16_t>;
681 using u32string_view = basic_string_view<char32_t>;
685 template<
typename _Tp>
690 :
public __hash_base<size_t, string_view>
693 operator()(
const string_view& __str)
const noexcept
694 {
return std::_Hash_impl::hash(__str.data(), __str.length()); }
701 #ifdef _GLIBCXX_USE_WCHAR_T
703 struct hash<wstring_view>
704 :
public __hash_base<size_t, wstring_view>
707 operator()(
const wstring_view& __s)
const noexcept
708 {
return std::_Hash_impl::hash(__s.data(),
709 __s.length() *
sizeof(wchar_t)); }
717 #ifdef _GLIBCXX_USE_CHAR8_T
719 struct hash<u8string_view>
720 :
public __hash_base<size_t, u8string_view>
723 operator()(
const u8string_view& __str)
const noexcept
724 {
return std::_Hash_impl::hash(__str.data(), __str.length()); }
733 struct hash<u16string_view>
734 :
public __hash_base<size_t, u16string_view>
737 operator()(
const u16string_view& __s)
const noexcept
738 {
return std::_Hash_impl::hash(__s.data(),
739 __s.length() *
sizeof(char16_t)); }
747 struct hash<u32string_view>
748 :
public __hash_base<size_t, u32string_view>
751 operator()(
const u32string_view& __s)
const noexcept
752 {
return std::_Hash_impl::hash(__s.data(),
753 __s.length() *
sizeof(char32_t)); }
760 inline namespace literals
762 inline namespace string_view_literals
764 #pragma GCC diagnostic push
765 #pragma GCC diagnostic ignored "-Wliteral-suffix"
766 inline constexpr basic_string_view<char>
767 operator""sv(
const char* __str,
size_t __len) noexcept
768 {
return basic_string_view<char>{__str, __len}; }
770 #ifdef _GLIBCXX_USE_WCHAR_T
771 inline constexpr basic_string_view<wchar_t>
772 operator""sv(
const wchar_t* __str,
size_t __len) noexcept
773 {
return basic_string_view<wchar_t>{__str, __len}; }
776 #ifdef _GLIBCXX_USE_CHAR8_T
777 inline constexpr basic_string_view<char8_t>
778 operator""sv(
const char8_t* __str,
size_t __len) noexcept
779 {
return basic_string_view<char8_t>{__str, __len}; }
782 inline constexpr basic_string_view<char16_t>
783 operator""sv(
const char16_t* __str,
size_t __len) noexcept
784 {
return basic_string_view<char16_t>{__str, __len}; }
786 inline constexpr basic_string_view<char32_t>
787 operator""sv(
const char32_t* __str,
size_t __len) noexcept
788 {
return basic_string_view<char32_t>{__str, __len}; }
790 #pragma GCC diagnostic pop
794 #if __cpp_lib_concepts
798 template<
typename _CharT,
typename _Traits>
799 inline constexpr
bool
800 enable_borrowed_range<basic_string_view<_CharT, _Traits>> =
true;
803 template<
typename _CharT,
typename _Traits>
804 inline constexpr
bool
805 enable_view<basic_string_view<_CharT, _Traits>> =
true;
808 _GLIBCXX_END_NAMESPACE_VERSION
811 #include <bits/string_view.tcc>
813 #endif // __cplusplus <= 201402L
815 #endif // _GLIBCXX_EXPERIMENTAL_STRING_VIEW
Primary class template hash.
A non-owning reference to a string.
constexpr const _Tp & min(const _Tp &, const _Tp &)
This does what you think it does.
constexpr auto data(_Container &__cont) noexcept(noexcept(__cont.data())) -> decltype(__cont.data())
Return the data pointer of a container.
__numeric_traits_integer< _Tp > __int_traits
Convenience alias for __numeric_traits<integer-type>.
constexpr auto size(const _Container &__cont) noexcept(noexcept(__cont.size())) -> decltype(__cont.size())
Return the size of a container.