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 201803
55 __sv_check(
size_t __size,
size_t __pos,
const char* __s)
58 __throw_out_of_range_fmt(__N(
"%s: __pos (which is %zu) > __size "
59 "(which is %zu)"), __s, __pos, __size);
66 __sv_limit(
size_t __size,
size_t __pos,
size_t __off) noexcept
68 const bool __testoff = __off < __size - __pos;
69 return __testoff ? __off : __size - __pos;
90 template<
typename _CharT,
typename _Traits = std::
char_traits<_CharT>>
91 class basic_string_view
93 static_assert(!is_array_v<_CharT>);
94 static_assert(is_trivial_v<_CharT> && is_standard_layout_v<_CharT>);
95 static_assert(is_same_v<_CharT, typename _Traits::char_type>);
100 using traits_type = _Traits;
101 using value_type = _CharT;
102 using pointer = value_type*;
103 using const_pointer =
const value_type*;
104 using reference = value_type&;
105 using const_reference =
const value_type&;
106 using const_iterator =
const value_type*;
107 using iterator = const_iterator;
109 using reverse_iterator = const_reverse_iterator;
110 using size_type = size_t;
111 using difference_type = ptrdiff_t;
112 static constexpr size_type npos = size_type(-1);
117 basic_string_view() noexcept
118 : _M_len{0}, _M_str{
nullptr}
121 constexpr basic_string_view(
const basic_string_view&) noexcept =
default;
123 __attribute__((__nonnull__)) constexpr
124 basic_string_view(
const _CharT* __str) noexcept
125 : _M_len{traits_type::length(__str)},
130 basic_string_view(
const _CharT* __str, size_type __len) noexcept
131 : _M_len{__len}, _M_str{__str}
134 #if __cplusplus > 201703L && __cpp_lib_concepts
135 template<contiguous_iterator _It, sized_sentinel_for<_It> _End>
136 requires same_as<iter_value_t<_It>, _CharT>
137 && (!convertible_to<_End, size_type>)
139 basic_string_view(_It __first, _End __last)
140 : _M_len(__last - __first), _M_str(
std::to_address(__first))
144 constexpr basic_string_view&
145 operator=(
const basic_string_view&) noexcept =
default;
149 constexpr const_iterator
150 begin() const noexcept
151 {
return this->_M_str; }
153 constexpr const_iterator
155 {
return this->_M_str + this->_M_len; }
157 constexpr const_iterator
159 {
return this->_M_str; }
161 constexpr const_iterator
162 cend() const noexcept
163 {
return this->_M_str + this->_M_len; }
165 constexpr const_reverse_iterator
167 {
return const_reverse_iterator(this->
end()); }
169 constexpr const_reverse_iterator
170 rend() const noexcept
171 {
return const_reverse_iterator(this->
begin()); }
173 constexpr const_reverse_iterator
175 {
return const_reverse_iterator(this->
end()); }
177 constexpr const_reverse_iterator
178 crend() const noexcept
179 {
return const_reverse_iterator(this->
begin()); }
184 size() const noexcept
185 {
return this->_M_len; }
188 length() const noexcept
192 max_size() const noexcept
194 return (npos -
sizeof(size_type) -
sizeof(
void*))
195 /
sizeof(value_type) / 4;
198 [[nodiscard]] constexpr
bool
199 empty() const noexcept
200 {
return this->_M_len == 0; }
204 constexpr const_reference
205 operator[](size_type __pos)
const noexcept
209 return *(this->_M_str + __pos);
212 constexpr const_reference
213 at(size_type __pos)
const
216 __throw_out_of_range_fmt(__N(
"basic_string_view::at: __pos "
217 "(which is %zu) >= this->size() "
218 "(which is %zu)"), __pos, this->size());
219 return *(this->_M_str + __pos);
222 constexpr const_reference
223 front() const noexcept
227 return *this->_M_str;
230 constexpr const_reference
231 back() const noexcept
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
267 copy(_CharT* __str, size_type __n, size_type __pos = 0)
const
269 __glibcxx_requires_string_len(__str, __n);
270 __pos = std::__sv_check(size(), __pos,
"basic_string_view::copy");
271 const size_type __rlen =
std::min(__n, _M_len - __pos);
274 traits_type::copy(__str, data() + __pos, __rlen);
278 constexpr basic_string_view
279 substr(size_type __pos = 0, size_type __n = npos)
const noexcept(
false)
281 __pos = std::__sv_check(size(), __pos,
"basic_string_view::substr");
282 const size_type __rlen =
std::min(__n, _M_len - __pos);
283 return basic_string_view{_M_str + __pos, __rlen};
287 compare(basic_string_view __str)
const noexcept
289 const size_type __rlen =
std::min(this->_M_len, __str._M_len);
290 int __ret = traits_type::compare(this->_M_str, __str._M_str, __rlen);
292 __ret = _S_compare(this->_M_len, __str._M_len);
297 compare(size_type __pos1, size_type __n1, basic_string_view __str)
const
298 {
return this->substr(__pos1, __n1).compare(__str); }
301 compare(size_type __pos1, size_type __n1,
302 basic_string_view __str, size_type __pos2, size_type __n2)
const
304 return this->substr(__pos1, __n1).compare(__str.substr(__pos2, __n2));
307 __attribute__((__nonnull__)) constexpr
int
308 compare(
const _CharT* __str)
const noexcept
309 {
return this->compare(basic_string_view{__str}); }
311 __attribute__((__nonnull__)) constexpr
int
312 compare(size_type __pos1, size_type __n1,
const _CharT* __str)
const
313 {
return this->substr(__pos1, __n1).compare(basic_string_view{__str}); }
316 compare(size_type __pos1, size_type __n1,
317 const _CharT* __str, size_type __n2)
const noexcept(
false)
319 return this->substr(__pos1, __n1)
320 .compare(basic_string_view(__str, __n2));
323 #if __cplusplus > 201703L
325 starts_with(basic_string_view __x)
const noexcept
326 {
return this->substr(0, __x.size()) == __x; }
329 starts_with(_CharT __x)
const noexcept
330 {
return !this->empty() && traits_type::eq(this->front(), __x); }
333 starts_with(
const _CharT* __x)
const noexcept
334 {
return this->starts_with(basic_string_view(__x)); }
337 ends_with(basic_string_view __x)
const noexcept
339 return this->size() >= __x.size()
340 && this->compare(this->size() - __x.size(), npos, __x) == 0;
344 ends_with(_CharT __x)
const noexcept
345 {
return !this->empty() && traits_type::eq(this->back(), __x); }
348 ends_with(
const _CharT* __x)
const noexcept
349 {
return this->ends_with(basic_string_view(__x)); }
355 find(basic_string_view __str, size_type __pos = 0) const noexcept
356 {
return this->find(__str._M_str, __pos, __str._M_len); }
359 find(_CharT __c, size_type __pos = 0) const noexcept;
362 find(const _CharT* __str, size_type __pos, size_type __n) const noexcept;
364 __attribute__((__nonnull__)) constexpr size_type
365 find(const _CharT* __str, size_type __pos = 0) const noexcept
366 {
return this->find(__str, __pos, traits_type::length(__str)); }
369 rfind(basic_string_view __str, size_type __pos = npos)
const noexcept
370 {
return this->rfind(__str._M_str, __pos, __str._M_len); }
373 rfind(_CharT __c, size_type __pos = npos)
const noexcept;
376 rfind(
const _CharT* __str, size_type __pos, size_type __n)
const noexcept;
378 __attribute__((__nonnull__)) constexpr size_type
379 rfind(
const _CharT* __str, size_type __pos = npos)
const noexcept
380 {
return this->rfind(__str, __pos, traits_type::length(__str)); }
383 find_first_of(basic_string_view __str, size_type __pos = 0) const noexcept
384 {
return this->find_first_of(__str._M_str, __pos, __str._M_len); }
387 find_first_of(_CharT __c, size_type __pos = 0) const noexcept
388 {
return this->find(__c, __pos); }
391 find_first_of(
const _CharT* __str, size_type __pos,
392 size_type __n)
const noexcept;
394 __attribute__((__nonnull__)) constexpr size_type
395 find_first_of(
const _CharT* __str, size_type __pos = 0) const noexcept
396 {
return this->find_first_of(__str, __pos, traits_type::length(__str)); }
399 find_last_of(basic_string_view __str,
400 size_type __pos = npos)
const noexcept
401 {
return this->find_last_of(__str._M_str, __pos, __str._M_len); }
404 find_last_of(_CharT __c, size_type __pos=npos)
const noexcept
405 {
return this->rfind(__c, __pos); }
408 find_last_of(
const _CharT* __str, size_type __pos,
409 size_type __n)
const noexcept;
411 __attribute__((__nonnull__)) constexpr size_type
412 find_last_of(
const _CharT* __str, size_type __pos = npos)
const noexcept
413 {
return this->find_last_of(__str, __pos, traits_type::length(__str)); }
416 find_first_not_of(basic_string_view __str,
417 size_type __pos = 0) const noexcept
418 {
return this->find_first_not_of(__str._M_str, __pos, __str._M_len); }
421 find_first_not_of(_CharT __c, size_type __pos = 0) const noexcept;
424 find_first_not_of(const _CharT* __str,
425 size_type __pos, size_type __n) const noexcept;
427 __attribute__((__nonnull__)) constexpr size_type
428 find_first_not_of(const _CharT* __str, size_type __pos = 0) const noexcept
430 return this->find_first_not_of(__str, __pos,
431 traits_type::length(__str));
435 find_last_not_of(basic_string_view __str,
436 size_type __pos = npos)
const noexcept
437 {
return this->find_last_not_of(__str._M_str, __pos, __str._M_len); }
440 find_last_not_of(_CharT __c, size_type __pos = npos)
const noexcept;
443 find_last_not_of(
const _CharT* __str,
444 size_type __pos, size_type __n)
const noexcept;
446 __attribute__((__nonnull__)) constexpr size_type
447 find_last_not_of(
const _CharT* __str,
448 size_type __pos = npos)
const noexcept
450 return this->find_last_not_of(__str, __pos,
451 traits_type::length(__str));
457 _S_compare(size_type __n1, size_type __n2) noexcept
459 const difference_type __diff = __n1 - __n2;
464 return static_cast<int>(__diff);
468 const _CharT* _M_str;
471 #if __cplusplus > 201703L && __cpp_lib_concepts && __cpp_deduction_guides
472 template<contiguous_iterator _It, sized_sentinel_for<_It> _End>
473 basic_string_view(_It, _End) -> basic_string_view<iter_value_t<_It>>;
483 template<
typename _CharT,
typename _Traits>
485 operator==(basic_string_view<_CharT, _Traits> __x,
486 basic_string_view<_CharT, _Traits> __y) noexcept
487 {
return __x.size() == __y.size() && __x.compare(__y) == 0; }
489 template<
typename _CharT,
typename _Traits>
491 operator==(basic_string_view<_CharT, _Traits> __x,
492 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
494 {
return __x.size() == __y.size() && __x.compare(__y) == 0; }
496 template<
typename _CharT,
typename _Traits>
498 operator==(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
499 basic_string_view<_CharT, _Traits> __y) noexcept
500 {
return __x.size() == __y.size() && __x.compare(__y) == 0; }
502 template<
typename _CharT,
typename _Traits>
504 operator!=(basic_string_view<_CharT, _Traits> __x,
505 basic_string_view<_CharT, _Traits> __y) noexcept
506 {
return !(__x == __y); }
508 template<
typename _CharT,
typename _Traits>
510 operator!=(basic_string_view<_CharT, _Traits> __x,
511 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
513 {
return !(__x == __y); }
515 template<
typename _CharT,
typename _Traits>
517 operator!=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
518 basic_string_view<_CharT, _Traits> __y) noexcept
519 {
return !(__x == __y); }
521 template<
typename _CharT,
typename _Traits>
523 operator< (basic_string_view<_CharT, _Traits> __x,
524 basic_string_view<_CharT, _Traits> __y) noexcept
525 {
return __x.compare(__y) < 0; }
527 template<
typename _CharT,
typename _Traits>
529 operator< (basic_string_view<_CharT, _Traits> __x,
530 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
532 {
return __x.compare(__y) < 0; }
534 template<
typename _CharT,
typename _Traits>
536 operator< (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
537 basic_string_view<_CharT, _Traits> __y) noexcept
538 {
return __x.compare(__y) < 0; }
540 template<
typename _CharT,
typename _Traits>
542 operator> (basic_string_view<_CharT, _Traits> __x,
543 basic_string_view<_CharT, _Traits> __y) noexcept
544 {
return __x.compare(__y) > 0; }
546 template<
typename _CharT,
typename _Traits>
548 operator> (basic_string_view<_CharT, _Traits> __x,
549 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
551 {
return __x.compare(__y) > 0; }
553 template<
typename _CharT,
typename _Traits>
555 operator> (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
556 basic_string_view<_CharT, _Traits> __y) noexcept
557 {
return __x.compare(__y) > 0; }
559 template<
typename _CharT,
typename _Traits>
561 operator<=(basic_string_view<_CharT, _Traits> __x,
562 basic_string_view<_CharT, _Traits> __y) noexcept
563 {
return __x.compare(__y) <= 0; }
565 template<
typename _CharT,
typename _Traits>
567 operator<=(basic_string_view<_CharT, _Traits> __x,
568 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
570 {
return __x.compare(__y) <= 0; }
572 template<
typename _CharT,
typename _Traits>
574 operator<=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
575 basic_string_view<_CharT, _Traits> __y) noexcept
576 {
return __x.compare(__y) <= 0; }
578 template<
typename _CharT,
typename _Traits>
580 operator>=(basic_string_view<_CharT, _Traits> __x,
581 basic_string_view<_CharT, _Traits> __y) noexcept
582 {
return __x.compare(__y) >= 0; }
584 template<
typename _CharT,
typename _Traits>
586 operator>=(basic_string_view<_CharT, _Traits> __x,
587 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
589 {
return __x.compare(__y) >= 0; }
591 template<
typename _CharT,
typename _Traits>
593 operator>=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
594 basic_string_view<_CharT, _Traits> __y) noexcept
595 {
return __x.compare(__y) >= 0; }
598 template<
typename _CharT,
typename _Traits>
599 inline basic_ostream<_CharT, _Traits>&
600 operator<<(basic_ostream<_CharT, _Traits>& __os,
601 basic_string_view<_CharT,_Traits> __str)
602 {
return __ostream_insert(__os, __str.data(), __str.size()); }
607 using string_view = basic_string_view<char>;
608 #ifdef _GLIBCXX_USE_WCHAR_T
609 using wstring_view = basic_string_view<wchar_t>;
611 #ifdef _GLIBCXX_USE_CHAR8_T
612 using u8string_view = basic_string_view<char8_t>;
614 using u16string_view = basic_string_view<char16_t>;
615 using u32string_view = basic_string_view<char32_t>;
619 template<
typename _Tp>
623 struct hash<string_view>
624 :
public __hash_base<size_t, string_view>
627 operator()(
const string_view& __str)
const noexcept
628 {
return std::_Hash_impl::hash(__str.data(), __str.length()); }
635 #ifdef _GLIBCXX_USE_WCHAR_T
637 struct hash<wstring_view>
638 :
public __hash_base<size_t, wstring_view>
641 operator()(
const wstring_view& __s)
const noexcept
642 {
return std::_Hash_impl::hash(__s.data(),
643 __s.length() *
sizeof(wchar_t)); }
651 #ifdef _GLIBCXX_USE_CHAR8_T
653 struct hash<u8string_view>
654 :
public __hash_base<size_t, u8string_view>
657 operator()(
const u8string_view& __str)
const noexcept
658 {
return std::_Hash_impl::hash(__str.data(), __str.length()); }
667 struct hash<u16string_view>
668 :
public __hash_base<size_t, u16string_view>
671 operator()(
const u16string_view& __s)
const noexcept
672 {
return std::_Hash_impl::hash(__s.data(),
673 __s.length() *
sizeof(char16_t)); }
681 struct hash<u32string_view>
682 :
public __hash_base<size_t, u32string_view>
685 operator()(
const u32string_view& __s)
const noexcept
686 {
return std::_Hash_impl::hash(__s.data(),
687 __s.length() *
sizeof(char32_t)); }
694 inline namespace literals
696 inline namespace string_view_literals
698 #pragma GCC diagnostic push
699 #pragma GCC diagnostic ignored "-Wliteral-suffix"
700 inline constexpr basic_string_view<char>
701 operator""sv(
const char* __str,
size_t __len) noexcept
702 {
return basic_string_view<char>{__str, __len}; }
704 #ifdef _GLIBCXX_USE_WCHAR_T
705 inline constexpr basic_string_view<wchar_t>
706 operator""sv(
const wchar_t* __str,
size_t __len) noexcept
707 {
return basic_string_view<wchar_t>{__str, __len}; }
710 #ifdef _GLIBCXX_USE_CHAR8_T
711 inline constexpr basic_string_view<char8_t>
712 operator""sv(
const char8_t* __str,
size_t __len) noexcept
713 {
return basic_string_view<char8_t>{__str, __len}; }
716 inline constexpr basic_string_view<char16_t>
717 operator""sv(
const char16_t* __str,
size_t __len) noexcept
718 {
return basic_string_view<char16_t>{__str, __len}; }
720 inline constexpr basic_string_view<char32_t>
721 operator""sv(
const char32_t* __str,
size_t __len) noexcept
722 {
return basic_string_view<char32_t>{__str, __len}; }
724 #pragma GCC diagnostic pop
728 #if __cpp_lib_concepts
732 template<
typename _CharT,
typename _Traits>
733 inline constexpr
bool
734 enable_borrowed_range<basic_string_view<_CharT, _Traits>> =
true;
737 template<
typename _CharT,
typename _Traits>
738 inline constexpr
bool
739 enable_view<basic_string_view<_CharT, _Traits>> =
true;
742 _GLIBCXX_END_NAMESPACE_VERSION
745 #include <bits/string_view.tcc>
747 #endif // __cplusplus <= 201402L
749 #endif // _GLIBCXX_EXPERIMENTAL_STRING_VIEW