33 #ifndef _GLIBCXX_STRING_VIEW
34 #define _GLIBCXX_STRING_VIEW 1
36 #pragma GCC system_header
38 #if __cplusplus >= 201703L
49 #if __cplusplus >= 202002L
53 namespace std _GLIBCXX_VISIBILITY(default)
55 _GLIBCXX_BEGIN_NAMESPACE_VERSION
57 # define __cpp_lib_string_view 201803L
58 #if __cplusplus > 201703L
59 # define __cpp_lib_constexpr_string_view 201811L
64 __sv_check(
size_t __size,
size_t __pos,
const char* __s)
67 __throw_out_of_range_fmt(__N(
"%s: __pos (which is %zu) > __size "
68 "(which is %zu)"), __s, __pos, __size);
75 __sv_limit(
size_t __size,
size_t __pos,
size_t __off) noexcept
77 const bool __testoff = __off < __size - __pos;
78 return __testoff ? __off : __size - __pos;
99 template<
typename _CharT,
typename _Traits = std::
char_traits<_CharT>>
102 static_assert(!is_array_v<_CharT>);
103 static_assert(is_trivial_v<_CharT> && is_standard_layout_v<_CharT>);
104 static_assert(is_same_v<_CharT, typename _Traits::char_type>);
109 using traits_type = _Traits;
110 using value_type = _CharT;
111 using pointer = value_type*;
112 using const_pointer =
const value_type*;
113 using reference = value_type&;
114 using const_reference =
const value_type&;
115 using const_iterator =
const value_type*;
116 using iterator = const_iterator;
119 using size_type = size_t;
120 using difference_type = ptrdiff_t;
121 static constexpr size_type npos = size_type(-1);
127 : _M_len{0}, _M_str{
nullptr}
132 __attribute__((__nonnull__)) constexpr
134 : _M_len{traits_type::length(__str)},
140 : _M_len{__len}, _M_str{__str}
143 #if __cplusplus >= 202002L && __cpp_lib_concepts
144 template<contiguous_iterator _It, sized_sentinel_for<_It> _End>
145 requires same_as<iter_value_t<_It>, _CharT>
146 && (!convertible_to<_End, size_type>)
149 noexcept(noexcept(__last - __first))
153 #if __cplusplus > 202002L
154 template<
typename _Range,
typename _DRange = remove_cvref_t<_Range>>
155 requires (!is_same_v<_DRange, basic_string_view>)
156 && ranges::contiguous_range<_Range>
157 && ranges::sized_range<_Range>
158 && is_same_v<ranges::range_value_t<_Range>, _CharT>
159 && (!is_convertible_v<_Range, const _CharT*>)
160 && (!requires (_DRange& __d) {
161 __d.operator ::std::basic_string_view<_CharT, _Traits>();
163 && (!requires {
typename _DRange::traits_type; }
164 || is_same_v<typename _DRange::traits_type, _Traits>)
167 noexcept(noexcept(ranges::size(__r)) && noexcept(ranges::data(__r)))
168 : _M_len(ranges::size(__r)), _M_str(ranges::data(__r))
180 constexpr const_iterator
181 begin()
const noexcept
182 {
return this->_M_str; }
184 constexpr const_iterator
186 {
return this->_M_str + this->_M_len; }
188 constexpr const_iterator
189 cbegin()
const noexcept
190 {
return this->_M_str; }
192 constexpr const_iterator
193 cend()
const noexcept
194 {
return this->_M_str + this->_M_len; }
197 rbegin()
const noexcept
201 rend()
const noexcept
205 crbegin()
const noexcept
209 crend()
const noexcept
215 size()
const noexcept
216 {
return this->_M_len; }
219 length()
const noexcept
223 max_size()
const noexcept
225 return (npos -
sizeof(size_type) -
sizeof(
void*))
226 /
sizeof(value_type) / 4;
229 [[nodiscard]] constexpr
bool
230 empty()
const noexcept
231 {
return this->_M_len == 0; }
235 constexpr const_reference
236 operator[](size_type __pos)
const noexcept
238 __glibcxx_assert(__pos < this->_M_len);
239 return *(this->_M_str + __pos);
242 constexpr const_reference
243 at(size_type __pos)
const
246 __throw_out_of_range_fmt(__N(
"basic_string_view::at: __pos "
247 "(which is %zu) >= this->size() "
248 "(which is %zu)"), __pos, this->size());
249 return *(this->_M_str + __pos);
252 constexpr const_reference
253 front()
const noexcept
255 __glibcxx_assert(this->_M_len > 0);
256 return *this->_M_str;
259 constexpr const_reference
260 back()
const noexcept
262 __glibcxx_assert(this->_M_len > 0);
263 return *(this->_M_str + this->_M_len - 1);
266 constexpr const_pointer
267 data()
const noexcept
268 {
return this->_M_str; }
273 remove_prefix(size_type __n) noexcept
275 __glibcxx_assert(this->_M_len >= __n);
281 remove_suffix(size_type __n) noexcept
282 { this->_M_len -= __n; }
296 copy(_CharT* __str, size_type __n, size_type __pos = 0)
const
298 __glibcxx_requires_string_len(__str, __n);
299 __pos = std::__sv_check(size(), __pos,
"basic_string_view::copy");
300 const size_type __rlen =
std::min(__n, _M_len - __pos);
303 traits_type::copy(__str, data() + __pos, __rlen);
308 substr(size_type __pos = 0, size_type __n = npos)
const noexcept(
false)
310 __pos = std::__sv_check(size(), __pos,
"basic_string_view::substr");
311 const size_type __rlen =
std::min(__n, _M_len - __pos);
318 const size_type __rlen =
std::min(this->_M_len, __str._M_len);
319 int __ret = traits_type::compare(this->_M_str, __str._M_str, __rlen);
321 __ret = _S_compare(this->_M_len, __str._M_len);
327 {
return this->substr(__pos1, __n1).compare(__str); }
330 compare(size_type __pos1, size_type __n1,
333 return this->substr(__pos1, __n1).compare(__str.substr(__pos2, __n2));
336 __attribute__((__nonnull__)) constexpr
int
337 compare(
const _CharT* __str)
const noexcept
340 __attribute__((__nonnull__)) constexpr
int
341 compare(size_type __pos1, size_type __n1,
const _CharT* __str)
const
345 compare(size_type __pos1, size_type __n1,
346 const _CharT* __str, size_type __n2)
const noexcept(
false)
348 return this->substr(__pos1, __n1)
352 #if __cplusplus > 201703L
353 #define __cpp_lib_starts_ends_with 201711L
356 {
return this->substr(0, __x.size()) == __x; }
359 starts_with(_CharT __x)
const noexcept
360 {
return !this->empty() && traits_type::eq(this->front(), __x); }
363 starts_with(
const _CharT* __x)
const noexcept
369 const auto __len = this->size();
370 const auto __xlen = __x.size();
371 return __len >= __xlen
372 && traits_type::compare(end() - __xlen, __x.data(), __xlen) == 0;
376 ends_with(_CharT __x)
const noexcept
377 {
return !this->empty() && traits_type::eq(this->back(), __x); }
380 ends_with(
const _CharT* __x)
const noexcept
384 #if __cplusplus > 202002L
385 #define __cpp_lib_string_contains 202011L
388 {
return this->find(__x) != npos; }
391 contains(_CharT __x)
const noexcept
392 {
return this->find(__x) != npos; }
395 contains(
const _CharT* __x)
const noexcept
396 {
return this->find(__x) != npos; }
403 {
return this->find(__str._M_str, __pos, __str._M_len); }
406 find(_CharT __c, size_type __pos = 0)
const noexcept;
409 find(
const _CharT* __str, size_type __pos, size_type __n)
const noexcept;
411 __attribute__((__nonnull__)) constexpr size_type
412 find(
const _CharT* __str, size_type __pos = 0)
const noexcept
413 {
return this->find(__str, __pos, traits_type::length(__str)); }
417 {
return this->rfind(__str._M_str, __pos, __str._M_len); }
420 rfind(_CharT __c, size_type __pos = npos)
const noexcept;
423 rfind(
const _CharT* __str, size_type __pos, size_type __n)
const noexcept;
425 __attribute__((__nonnull__)) constexpr size_type
426 rfind(
const _CharT* __str, size_type __pos = npos)
const noexcept
427 {
return this->rfind(__str, __pos, traits_type::length(__str)); }
431 {
return this->find_first_of(__str._M_str, __pos, __str._M_len); }
434 find_first_of(_CharT __c, size_type __pos = 0)
const noexcept
435 {
return this->find(__c, __pos); }
438 find_first_of(
const _CharT* __str, size_type __pos,
439 size_type __n)
const noexcept;
441 __attribute__((__nonnull__)) constexpr size_type
442 find_first_of(
const _CharT* __str, size_type __pos = 0)
const noexcept
443 {
return this->find_first_of(__str, __pos, traits_type::length(__str)); }
447 size_type __pos = npos)
const noexcept
448 {
return this->find_last_of(__str._M_str, __pos, __str._M_len); }
451 find_last_of(_CharT __c, size_type __pos=npos)
const noexcept
452 {
return this->rfind(__c, __pos); }
455 find_last_of(
const _CharT* __str, size_type __pos,
456 size_type __n)
const noexcept;
458 __attribute__((__nonnull__)) constexpr size_type
459 find_last_of(
const _CharT* __str, size_type __pos = npos)
const noexcept
460 {
return this->find_last_of(__str, __pos, traits_type::length(__str)); }
464 size_type __pos = 0)
const noexcept
465 {
return this->find_first_not_of(__str._M_str, __pos, __str._M_len); }
468 find_first_not_of(_CharT __c, size_type __pos = 0)
const noexcept;
471 find_first_not_of(
const _CharT* __str,
472 size_type __pos, size_type __n)
const noexcept;
474 __attribute__((__nonnull__)) constexpr size_type
475 find_first_not_of(
const _CharT* __str, size_type __pos = 0)
const noexcept
477 return this->find_first_not_of(__str, __pos,
478 traits_type::length(__str));
483 size_type __pos = npos)
const noexcept
484 {
return this->find_last_not_of(__str._M_str, __pos, __str._M_len); }
487 find_last_not_of(_CharT __c, size_type __pos = npos)
const noexcept;
490 find_last_not_of(
const _CharT* __str,
491 size_type __pos, size_type __n)
const noexcept;
493 __attribute__((__nonnull__)) constexpr size_type
494 find_last_not_of(
const _CharT* __str,
495 size_type __pos = npos)
const noexcept
497 return this->find_last_not_of(__str, __pos,
498 traits_type::length(__str));
504 _S_compare(size_type __n1, size_type __n2) noexcept
507 const difference_type __diff = __n1 - __n2;
508 if (__diff > __limits::__max)
509 return __limits::__max;
510 if (__diff < __limits::__min)
511 return __limits::__min;
512 return static_cast<int>(__diff);
516 const _CharT* _M_str;
519 #if __cplusplus > 201703L && __cpp_lib_concepts && __cpp_deduction_guides
520 template<contiguous_iterator _It, sized_sentinel_for<_It> _End>
523 #if __cplusplus > 202002L
524 template<ranges::contiguous_range _Range>
537 template<
typename _CharT,
typename _Traits>
541 {
return __x.size() == __y.size() && __x.compare(__y) == 0; }
543 template<
typename _CharT,
typename _Traits>
545 operator==(basic_string_view<_CharT, _Traits> __x,
546 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
548 {
return __x.size() == __y.size() && __x.compare(__y) == 0; }
550 #if __cpp_lib_three_way_comparison
551 template<
typename _CharT,
typename _Traits>
553 operator<=>(basic_string_view<_CharT, _Traits> __x,
554 basic_string_view<_CharT, _Traits> __y) noexcept
555 -> decltype(__detail::__char_traits_cmp_cat<_Traits>(0))
556 {
return __detail::__char_traits_cmp_cat<_Traits>(__x.compare(__y)); }
558 template<
typename _CharT,
typename _Traits>
560 operator<=>(basic_string_view<_CharT, _Traits> __x,
561 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
563 -> decltype(__detail::__char_traits_cmp_cat<_Traits>(0))
564 {
return __detail::__char_traits_cmp_cat<_Traits>(__x.compare(__y)); }
566 template<
typename _CharT,
typename _Traits>
568 operator==(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
569 basic_string_view<_CharT, _Traits> __y) noexcept
570 {
return __x.size() == __y.size() && __x.compare(__y) == 0; }
572 template<
typename _CharT,
typename _Traits>
574 operator!=(basic_string_view<_CharT, _Traits> __x,
575 basic_string_view<_CharT, _Traits> __y) noexcept
576 {
return !(__x == __y); }
578 template<
typename _CharT,
typename _Traits>
580 operator!=(basic_string_view<_CharT, _Traits> __x,
581 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
583 {
return !(__x == __y); }
585 template<
typename _CharT,
typename _Traits>
587 operator!=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
588 basic_string_view<_CharT, _Traits> __y) noexcept
589 {
return !(__x == __y); }
591 template<
typename _CharT,
typename _Traits>
593 operator< (basic_string_view<_CharT, _Traits> __x,
594 basic_string_view<_CharT, _Traits> __y) noexcept
595 {
return __x.compare(__y) < 0; }
597 template<
typename _CharT,
typename _Traits>
599 operator< (basic_string_view<_CharT, _Traits> __x,
600 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
602 {
return __x.compare(__y) < 0; }
604 template<
typename _CharT,
typename _Traits>
606 operator< (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
607 basic_string_view<_CharT, _Traits> __y) noexcept
608 {
return __x.compare(__y) < 0; }
610 template<
typename _CharT,
typename _Traits>
612 operator> (basic_string_view<_CharT, _Traits> __x,
613 basic_string_view<_CharT, _Traits> __y) noexcept
614 {
return __x.compare(__y) > 0; }
616 template<
typename _CharT,
typename _Traits>
618 operator> (basic_string_view<_CharT, _Traits> __x,
619 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
621 {
return __x.compare(__y) > 0; }
623 template<
typename _CharT,
typename _Traits>
625 operator> (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
626 basic_string_view<_CharT, _Traits> __y) noexcept
627 {
return __x.compare(__y) > 0; }
629 template<
typename _CharT,
typename _Traits>
631 operator<=(basic_string_view<_CharT, _Traits> __x,
632 basic_string_view<_CharT, _Traits> __y) noexcept
633 {
return __x.compare(__y) <= 0; }
635 template<
typename _CharT,
typename _Traits>
637 operator<=(basic_string_view<_CharT, _Traits> __x,
638 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
640 {
return __x.compare(__y) <= 0; }
642 template<
typename _CharT,
typename _Traits>
644 operator<=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
645 basic_string_view<_CharT, _Traits> __y) noexcept
646 {
return __x.compare(__y) <= 0; }
648 template<
typename _CharT,
typename _Traits>
650 operator>=(basic_string_view<_CharT, _Traits> __x,
651 basic_string_view<_CharT, _Traits> __y) noexcept
652 {
return __x.compare(__y) >= 0; }
654 template<
typename _CharT,
typename _Traits>
656 operator>=(basic_string_view<_CharT, _Traits> __x,
657 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
659 {
return __x.compare(__y) >= 0; }
661 template<
typename _CharT,
typename _Traits>
663 operator>=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
664 basic_string_view<_CharT, _Traits> __y) noexcept
665 {
return __x.compare(__y) >= 0; }
669 template<
typename _CharT,
typename _Traits>
670 inline basic_ostream<_CharT, _Traits>&
671 operator<<(basic_ostream<_CharT, _Traits>& __os,
672 basic_string_view<_CharT,_Traits> __str)
673 {
return __ostream_insert(__os, __str.data(), __str.size()); }
678 using string_view = basic_string_view<char>;
679 using wstring_view = basic_string_view<wchar_t>;
680 #ifdef _GLIBCXX_USE_CHAR8_T
681 using u8string_view = basic_string_view<char8_t>;
683 using u16string_view = basic_string_view<char16_t>;
684 using u32string_view = basic_string_view<char32_t>;
688 template<
typename _Tp>
692 struct hash<string_view>
693 :
public __hash_base<size_t, string_view>
696 operator()(
const string_view& __str)
const noexcept
697 {
return std::_Hash_impl::hash(__str.data(), __str.length()); }
705 struct hash<wstring_view>
706 :
public __hash_base<size_t, wstring_view>
709 operator()(
const wstring_view& __s)
const noexcept
710 {
return std::_Hash_impl::hash(__s.data(),
711 __s.length() *
sizeof(
wchar_t)); }
718 #ifdef _GLIBCXX_USE_CHAR8_T
720 struct hash<u8string_view>
721 :
public __hash_base<size_t, u8string_view>
724 operator()(
const u8string_view& __str)
const noexcept
725 {
return std::_Hash_impl::hash(__str.data(), __str.length()); }
734 struct hash<u16string_view>
735 :
public __hash_base<size_t, u16string_view>
738 operator()(
const u16string_view& __s)
const noexcept
739 {
return std::_Hash_impl::hash(__s.data(),
740 __s.length() *
sizeof(char16_t)); }
748 struct hash<u32string_view>
749 :
public __hash_base<size_t, u32string_view>
752 operator()(
const u32string_view& __s)
const noexcept
753 {
return std::_Hash_impl::hash(__s.data(),
754 __s.length() *
sizeof(char32_t)); }
761 inline namespace literals
763 inline namespace string_view_literals
765 #pragma GCC diagnostic push
766 #pragma GCC diagnostic ignored "-Wliteral-suffix"
767 inline constexpr basic_string_view<char>
768 operator""sv(
const char* __str,
size_t __len) noexcept
769 {
return basic_string_view<char>{__str, __len}; }
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}; }
775 #ifdef _GLIBCXX_USE_CHAR8_T
776 inline constexpr basic_string_view<char8_t>
777 operator""sv(
const char8_t* __str,
size_t __len) noexcept
778 {
return basic_string_view<char8_t>{__str, __len}; }
781 inline constexpr basic_string_view<char16_t>
782 operator""sv(
const char16_t* __str,
size_t __len) noexcept
783 {
return basic_string_view<char16_t>{__str, __len}; }
785 inline constexpr basic_string_view<char32_t>
786 operator""sv(
const char32_t* __str,
size_t __len) noexcept
787 {
return basic_string_view<char32_t>{__str, __len}; }
789 #pragma GCC diagnostic pop
793 #if __cpp_lib_concepts
797 template<
typename _CharT,
typename _Traits>
798 inline constexpr
bool
799 enable_borrowed_range<basic_string_view<_CharT, _Traits>> =
true;
802 template<
typename _CharT,
typename _Traits>
803 inline constexpr
bool
804 enable_view<basic_string_view<_CharT, _Traits>> =
true;
807 _GLIBCXX_END_NAMESPACE_VERSION
810 #include <bits/string_view.tcc>
constexpr _Tp * to_address(_Tp *__ptr) noexcept
Obtain address referenced by a pointer to an object.
constexpr const _Tp & min(const _Tp &, const _Tp &)
This does what you think it does.
ISO C++ entities toplevel namespace is std.
std::basic_ostream< _CharT, _Traits > & operator<<(std::basic_ostream< _CharT, _Traits > &__os, const bitset< _Nb > &__x)
Global I/O operators for bitsets.
__numeric_traits_integer< _Tp > __int_traits
Convenience alias for __numeric_traits<integer-type>.
A non-owning reference to a string.