33 #ifndef _GLIBCXX_STRING_VIEW
34 #define _GLIBCXX_STRING_VIEW 1
36 #pragma GCC system_header
38 #if __cplusplus >= 201703L
47 namespace std _GLIBCXX_VISIBILITY(default)
49 _GLIBCXX_BEGIN_NAMESPACE_VERSION
51 # define __cpp_lib_string_view 201803L
52 #if __cplusplus > 201703L
53 # define __cpp_lib_constexpr_string_view 201811L
58 __sv_check(
size_t __size,
size_t __pos,
const char* __s)
61 __throw_out_of_range_fmt(__N(
"%s: __pos (which is %zu) > __size "
62 "(which is %zu)"), __s, __pos, __size);
69 __sv_limit(
size_t __size,
size_t __pos,
size_t __off) noexcept
71 const bool __testoff = __off < __size - __pos;
72 return __testoff ? __off : __size - __pos;
93 template<
typename _CharT,
typename _Traits = std::
char_traits<_CharT>>
94 class basic_string_view
96 static_assert(!is_array_v<_CharT>);
97 static_assert(is_trivial_v<_CharT> && is_standard_layout_v<_CharT>);
98 static_assert(is_same_v<_CharT, typename _Traits::char_type>);
103 using traits_type = _Traits;
104 using value_type = _CharT;
105 using pointer = value_type*;
106 using const_pointer =
const value_type*;
107 using reference = value_type&;
108 using const_reference =
const value_type&;
109 using const_iterator =
const value_type*;
110 using iterator = const_iterator;
112 using reverse_iterator = const_reverse_iterator;
113 using size_type = size_t;
114 using difference_type = ptrdiff_t;
115 static constexpr size_type npos = size_type(-1);
120 basic_string_view() noexcept
121 : _M_len{0}, _M_str{
nullptr}
124 constexpr basic_string_view(
const basic_string_view&) noexcept = default;
126 __attribute__((__nonnull__)) constexpr
127 basic_string_view(const _CharT* __str) noexcept
128 : _M_len{traits_type::length(__str)},
133 basic_string_view(
const _CharT* __str, size_type __len) noexcept
134 : _M_len{__len}, _M_str{__str}
137 #if __cplusplus > 201703L && __cpp_lib_concepts
138 template<contiguous_iterator _It, sized_sentinel_for<_It> _End>
139 requires same_as<iter_value_t<_It>, _CharT>
140 && (!convertible_to<_End, size_type>)
142 basic_string_view(_It __first, _End __last)
143 : _M_len(__last - __first), _M_str(std::to_address(__first))
147 constexpr basic_string_view&
148 operator=(
const basic_string_view&) noexcept = default;
152 constexpr const_iterator
153 begin() const noexcept
154 {
return this->_M_str; }
156 constexpr const_iterator
158 {
return this->_M_str + this->_M_len; }
160 constexpr const_iterator
162 {
return this->_M_str; }
164 constexpr const_iterator
165 cend() const noexcept
166 {
return this->_M_str + this->_M_len; }
168 constexpr const_reverse_iterator
170 {
return const_reverse_iterator(this->
end()); }
172 constexpr const_reverse_iterator
173 rend() const noexcept
174 {
return const_reverse_iterator(this->
begin()); }
176 constexpr const_reverse_iterator
178 {
return const_reverse_iterator(this->
end()); }
180 constexpr const_reverse_iterator
181 crend() const noexcept
182 {
return const_reverse_iterator(this->
begin()); }
187 size() const noexcept
188 {
return this->_M_len; }
191 length() const noexcept
195 max_size() const noexcept
197 return (npos -
sizeof(size_type) -
sizeof(
void*))
198 /
sizeof(value_type) / 4;
201 [[nodiscard]] constexpr
bool
202 empty() const noexcept
203 {
return this->_M_len == 0; }
207 constexpr const_reference
208 operator[](size_type __pos)
const noexcept
210 __glibcxx_assert(__pos < this->_M_len);
211 return *(this->_M_str + __pos);
214 constexpr const_reference
215 at(size_type __pos)
const
218 __throw_out_of_range_fmt(__N(
"basic_string_view::at: __pos "
219 "(which is %zu) >= this->size() "
220 "(which is %zu)"), __pos, this->size());
221 return *(this->_M_str + __pos);
224 constexpr const_reference
225 front() const noexcept
227 __glibcxx_assert(this->_M_len > 0);
228 return *this->_M_str;
231 constexpr const_reference
232 back() const noexcept
234 __glibcxx_assert(this->_M_len > 0);
235 return *(this->_M_str + this->_M_len - 1);
238 constexpr const_pointer
239 data() const noexcept
240 {
return this->_M_str; }
245 remove_prefix(size_type __n) noexcept
247 __glibcxx_assert(this->_M_len >= __n);
253 remove_suffix(size_type __n) noexcept
254 { this->_M_len -= __n; }
257 swap(basic_string_view& __sv) noexcept
268 copy(_CharT* __str, size_type __n, size_type __pos = 0)
const
270 __glibcxx_requires_string_len(__str, __n);
271 __pos = std::__sv_check(size(), __pos,
"basic_string_view::copy");
272 const size_type __rlen =
std::min(__n, _M_len - __pos);
275 traits_type::copy(__str, data() + __pos, __rlen);
279 constexpr basic_string_view
280 substr(size_type __pos = 0, size_type __n = npos) const noexcept(false)
282 __pos = std::__sv_check(size(), __pos,
"basic_string_view::substr");
283 const size_type __rlen =
std::min(__n, _M_len - __pos);
284 return basic_string_view{_M_str + __pos, __rlen};
288 compare(basic_string_view __str)
const noexcept
290 const size_type __rlen =
std::min(this->_M_len, __str._M_len);
291 int __ret = traits_type::compare(this->_M_str, __str._M_str, __rlen);
293 __ret = _S_compare(this->_M_len, __str._M_len);
298 compare(size_type __pos1, size_type __n1, basic_string_view __str)
const
299 {
return this->substr(__pos1, __n1).compare(__str); }
302 compare(size_type __pos1, size_type __n1,
303 basic_string_view __str, size_type __pos2, size_type __n2)
const
305 return this->substr(__pos1, __n1).compare(__str.substr(__pos2, __n2));
308 __attribute__((__nonnull__)) constexpr
int
309 compare(const _CharT* __str) const noexcept
310 {
return this->compare(basic_string_view{__str}); }
312 __attribute__((__nonnull__)) constexpr
int
313 compare(size_type __pos1, size_type __n1, const _CharT* __str)
const
314 {
return this->substr(__pos1, __n1).compare(basic_string_view{__str}); }
317 compare(size_type __pos1, size_type __n1,
318 const _CharT* __str, size_type __n2)
const noexcept(
false)
320 return this->substr(__pos1, __n1)
321 .compare(basic_string_view(__str, __n2));
324 #if __cplusplus > 201703L
325 #define __cpp_lib_starts_ends_with 201711L
327 starts_with(basic_string_view __x)
const noexcept
328 {
return this->substr(0, __x.size()) == __x; }
331 starts_with(_CharT __x)
const noexcept
332 {
return !this->empty() && traits_type::eq(this->front(), __x); }
335 starts_with(
const _CharT* __x)
const noexcept
336 {
return this->starts_with(basic_string_view(__x)); }
339 ends_with(basic_string_view __x)
const noexcept
341 return this->size() >= __x.size()
342 && this->compare(this->size() - __x.size(), npos, __x) == 0;
346 ends_with(_CharT __x)
const noexcept
347 {
return !this->empty() && traits_type::eq(this->back(), __x); }
350 ends_with(
const _CharT* __x)
const noexcept
351 {
return this->ends_with(basic_string_view(__x)); }
357 find(basic_string_view __str, size_type __pos = 0) const noexcept
358 {
return this->find(__str._M_str, __pos, __str._M_len); }
361 find(_CharT __c, size_type __pos = 0) const noexcept;
364 find(const _CharT* __str, size_type __pos, size_type __n) const noexcept;
366 __attribute__((__nonnull__)) constexpr size_type
367 find(const _CharT* __str, size_type __pos = 0) const noexcept
368 {
return this->find(__str, __pos, traits_type::length(__str)); }
371 rfind(basic_string_view __str, size_type __pos = npos) const noexcept
372 {
return this->rfind(__str._M_str, __pos, __str._M_len); }
375 rfind(_CharT __c, size_type __pos = npos) const noexcept;
378 rfind(const _CharT* __str, size_type __pos, size_type __n) const noexcept;
380 __attribute__((__nonnull__)) constexpr size_type
381 rfind(const _CharT* __str, size_type __pos = npos) const noexcept
382 {
return this->rfind(__str, __pos, traits_type::length(__str)); }
385 find_first_of(basic_string_view __str, size_type __pos = 0) const noexcept
386 {
return this->find_first_of(__str._M_str, __pos, __str._M_len); }
389 find_first_of(_CharT __c, size_type __pos = 0) const noexcept
390 {
return this->find(__c, __pos); }
393 find_first_of(
const _CharT* __str, size_type __pos,
394 size_type __n)
const noexcept;
396 __attribute__((__nonnull__)) constexpr size_type
397 find_first_of(const _CharT* __str, size_type __pos = 0) const noexcept
398 {
return this->find_first_of(__str, __pos, traits_type::length(__str)); }
401 find_last_of(basic_string_view __str,
402 size_type __pos = npos) const noexcept
403 {
return this->find_last_of(__str._M_str, __pos, __str._M_len); }
406 find_last_of(_CharT __c, size_type __pos=npos) const noexcept
407 {
return this->rfind(__c, __pos); }
410 find_last_of(
const _CharT* __str, size_type __pos,
411 size_type __n)
const noexcept;
413 __attribute__((__nonnull__)) constexpr size_type
414 find_last_of(const _CharT* __str, size_type __pos = npos) const noexcept
415 {
return this->find_last_of(__str, __pos, traits_type::length(__str)); }
418 find_first_not_of(basic_string_view __str,
419 size_type __pos = 0) const noexcept
420 {
return this->find_first_not_of(__str._M_str, __pos, __str._M_len); }
423 find_first_not_of(_CharT __c, size_type __pos = 0) const noexcept;
426 find_first_not_of(const _CharT* __str,
427 size_type __pos, size_type __n) const noexcept;
429 __attribute__((__nonnull__)) constexpr size_type
430 find_first_not_of(const _CharT* __str, size_type __pos = 0) const noexcept
432 return this->find_first_not_of(__str, __pos,
433 traits_type::length(__str));
437 find_last_not_of(basic_string_view __str,
438 size_type __pos = npos) const noexcept
439 {
return this->find_last_not_of(__str._M_str, __pos, __str._M_len); }
442 find_last_not_of(_CharT __c, size_type __pos = npos) const noexcept;
445 find_last_not_of(const _CharT* __str,
446 size_type __pos, size_type __n) const noexcept;
448 __attribute__((__nonnull__)) constexpr size_type
449 find_last_not_of(const _CharT* __str,
450 size_type __pos = npos) const noexcept
452 return this->find_last_not_of(__str, __pos,
453 traits_type::length(__str));
459 _S_compare(size_type __n1, size_type __n2) noexcept
461 const difference_type __diff = __n1 - __n2;
466 return static_cast<int>(__diff);
470 const _CharT* _M_str;
473 #if __cplusplus > 201703L && __cpp_lib_concepts && __cpp_deduction_guides
474 template<contiguous_iterator _It, sized_sentinel_for<_It> _End>
475 basic_string_view(_It, _End) -> basic_string_view<iter_value_t<_It>>;
485 template<
typename _CharT,
typename _Traits>
487 operator==(basic_string_view<_CharT, _Traits> __x,
488 basic_string_view<_CharT, _Traits> __y) noexcept
489 {
return __x.size() == __y.size() && __x.compare(__y) == 0; }
491 template<
typename _CharT,
typename _Traits>
493 operator==(basic_string_view<_CharT, _Traits> __x,
494 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
496 {
return __x.size() == __y.size() && __x.compare(__y) == 0; }
498 #if __cpp_lib_three_way_comparison
499 template<
typename _CharT,
typename _Traits>
501 operator<=>(basic_string_view<_CharT, _Traits> __x,
502 basic_string_view<_CharT, _Traits> __y) noexcept
503 -> decltype(__detail::__char_traits_cmp_cat<_Traits>(0))
504 {
return __detail::__char_traits_cmp_cat<_Traits>(__x.compare(__y)); }
506 template<
typename _CharT,
typename _Traits>
508 operator<=>(basic_string_view<_CharT, _Traits> __x,
509 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
511 -> decltype(__detail::__char_traits_cmp_cat<_Traits>(0))
512 {
return __detail::__char_traits_cmp_cat<_Traits>(__x.compare(__y)); }
514 template<
typename _CharT,
typename _Traits>
516 operator==(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
517 basic_string_view<_CharT, _Traits> __y) noexcept
518 {
return __x.size() == __y.size() && __x.compare(__y) == 0; }
520 template<
typename _CharT,
typename _Traits>
522 operator!=(basic_string_view<_CharT, _Traits> __x,
523 basic_string_view<_CharT, _Traits> __y) noexcept
524 {
return !(__x == __y); }
526 template<
typename _CharT,
typename _Traits>
528 operator!=(basic_string_view<_CharT, _Traits> __x,
529 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
531 {
return !(__x == __y); }
533 template<
typename _CharT,
typename _Traits>
535 operator!=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
536 basic_string_view<_CharT, _Traits> __y) noexcept
537 {
return !(__x == __y); }
539 template<
typename _CharT,
typename _Traits>
541 operator< (basic_string_view<_CharT, _Traits> __x,
542 basic_string_view<_CharT, _Traits> __y) noexcept
543 {
return __x.compare(__y) < 0; }
545 template<
typename _CharT,
typename _Traits>
547 operator< (basic_string_view<_CharT, _Traits> __x,
548 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
550 {
return __x.compare(__y) < 0; }
552 template<
typename _CharT,
typename _Traits>
554 operator< (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
555 basic_string_view<_CharT, _Traits> __y) noexcept
556 {
return __x.compare(__y) < 0; }
558 template<
typename _CharT,
typename _Traits>
560 operator> (basic_string_view<_CharT, _Traits> __x,
561 basic_string_view<_CharT, _Traits> __y) noexcept
562 {
return __x.compare(__y) > 0; }
564 template<
typename _CharT,
typename _Traits>
566 operator> (basic_string_view<_CharT, _Traits> __x,
567 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
569 {
return __x.compare(__y) > 0; }
571 template<
typename _CharT,
typename _Traits>
573 operator> (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
574 basic_string_view<_CharT, _Traits> __y) noexcept
575 {
return __x.compare(__y) > 0; }
577 template<
typename _CharT,
typename _Traits>
579 operator<=(basic_string_view<_CharT, _Traits> __x,
580 basic_string_view<_CharT, _Traits> __y) noexcept
581 {
return __x.compare(__y) <= 0; }
583 template<
typename _CharT,
typename _Traits>
585 operator<=(basic_string_view<_CharT, _Traits> __x,
586 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
588 {
return __x.compare(__y) <= 0; }
590 template<
typename _CharT,
typename _Traits>
592 operator<=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
593 basic_string_view<_CharT, _Traits> __y) noexcept
594 {
return __x.compare(__y) <= 0; }
596 template<
typename _CharT,
typename _Traits>
598 operator>=(basic_string_view<_CharT, _Traits> __x,
599 basic_string_view<_CharT, _Traits> __y) noexcept
600 {
return __x.compare(__y) >= 0; }
602 template<
typename _CharT,
typename _Traits>
604 operator>=(basic_string_view<_CharT, _Traits> __x,
605 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
607 {
return __x.compare(__y) >= 0; }
609 template<
typename _CharT,
typename _Traits>
611 operator>=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
612 basic_string_view<_CharT, _Traits> __y) noexcept
613 {
return __x.compare(__y) >= 0; }
614 #endif // three-way comparison
617 template<
typename _CharT,
typename _Traits>
618 inline basic_ostream<_CharT, _Traits>&
619 operator<<(basic_ostream<_CharT, _Traits>& __os,
620 basic_string_view<_CharT,_Traits> __str)
621 {
return __ostream_insert(__os, __str.data(), __str.size()); }
626 using string_view = basic_string_view<char>;
627 #ifdef _GLIBCXX_USE_WCHAR_T
628 using wstring_view = basic_string_view<wchar_t>;
630 #ifdef _GLIBCXX_USE_CHAR8_T
631 using u8string_view = basic_string_view<char8_t>;
633 using u16string_view = basic_string_view<char16_t>;
634 using u32string_view = basic_string_view<char32_t>;
638 template<
typename _Tp>
642 struct hash<string_view>
643 :
public __hash_base<size_t, string_view>
646 operator()(
const string_view& __str)
const noexcept
647 {
return std::_Hash_impl::hash(__str.data(), __str.length()); }
654 #ifdef _GLIBCXX_USE_WCHAR_T
656 struct hash<wstring_view>
657 :
public __hash_base<size_t, wstring_view>
660 operator()(
const wstring_view& __s)
const noexcept
661 {
return std::_Hash_impl::hash(__s.data(),
662 __s.length() *
sizeof(wchar_t)); }
670 #ifdef _GLIBCXX_USE_CHAR8_T
672 struct hash<u8string_view>
673 :
public __hash_base<size_t, u8string_view>
676 operator()(
const u8string_view& __str)
const noexcept
677 {
return std::_Hash_impl::hash(__str.data(), __str.length()); }
686 struct hash<u16string_view>
687 :
public __hash_base<size_t, u16string_view>
690 operator()(
const u16string_view& __s)
const noexcept
691 {
return std::_Hash_impl::hash(__s.data(),
692 __s.length() *
sizeof(char16_t)); }
700 struct hash<u32string_view>
701 :
public __hash_base<size_t, u32string_view>
704 operator()(
const u32string_view& __s)
const noexcept
705 {
return std::_Hash_impl::hash(__s.data(),
706 __s.length() *
sizeof(char32_t)); }
713 inline namespace literals
715 inline namespace string_view_literals
717 #pragma GCC diagnostic push
718 #pragma GCC diagnostic ignored "-Wliteral-suffix"
719 inline constexpr basic_string_view<char>
720 operator""sv(
const char* __str,
size_t __len) noexcept
721 {
return basic_string_view<char>{__str, __len}; }
723 #ifdef _GLIBCXX_USE_WCHAR_T
724 inline constexpr basic_string_view<wchar_t>
725 operator""sv(
const wchar_t* __str,
size_t __len) noexcept
726 {
return basic_string_view<wchar_t>{__str, __len}; }
729 #ifdef _GLIBCXX_USE_CHAR8_T
730 inline constexpr basic_string_view<char8_t>
731 operator""sv(
const char8_t* __str,
size_t __len) noexcept
732 {
return basic_string_view<char8_t>{__str, __len}; }
735 inline constexpr basic_string_view<char16_t>
736 operator""sv(
const char16_t* __str,
size_t __len) noexcept
737 {
return basic_string_view<char16_t>{__str, __len}; }
739 inline constexpr basic_string_view<char32_t>
740 operator""sv(
const char32_t* __str,
size_t __len) noexcept
741 {
return basic_string_view<char32_t>{__str, __len}; }
743 #pragma GCC diagnostic pop
747 #if __cpp_lib_concepts
751 template<
typename _CharT,
typename _Traits>
752 inline constexpr
bool
753 enable_borrowed_range<basic_string_view<_CharT, _Traits>> =
true;
756 template<
typename _CharT,
typename _Traits>
757 inline constexpr
bool
758 enable_view<basic_string_view<_CharT, _Traits>> =
true;
761 _GLIBCXX_END_NAMESPACE_VERSION
764 #include <bits/string_view.tcc>
766 #endif // __cplusplus <= 201402L
768 #endif // _GLIBCXX_EXPERIMENTAL_STRING_VIEW
constexpr auto rend(_Container &__cont) -> decltype(__cont.rend())
Return a reverse iterator pointing one past the first element of the container.
_Tp * begin(valarray< _Tp > &__va)
Return an iterator pointing to the first element of the valarray.
constexpr auto crend(const _Container &__cont) -> decltype(std::rend(__cont))
Return a reverse iterator pointing one past the first element of the const container.
constexpr auto crbegin(const _Container &__cont) -> decltype(std::rbegin(__cont))
Return a reverse iterator pointing to the last element of the const container.
constexpr auto cbegin(const _Container &__cont) noexcept(noexcept(std::begin(__cont))) -> decltype(std::begin(__cont))
Return an iterator pointing to the first element of the const container.
constexpr auto rbegin(_Container &__cont) -> decltype(__cont.rbegin())
Return a reverse iterator pointing to the last element of the container.
_Tp * end(valarray< _Tp > &__va)
Return an iterator pointing to one past the last element of the valarray.
constexpr auto cend(const _Container &__cont) noexcept(noexcept(std::end(__cont))) -> decltype(std::end(__cont))
Return an iterator pointing to one past the last element of the const container.
constexpr const _Tp & min(const _Tp &, const _Tp &)
This does what you think it does.
__numeric_traits_integer< _Tp > __int_traits
Convenience alias for __numeric_traits<integer-type>.