33 #ifndef _GLIBCXX_STRING_VIEW
34 #define _GLIBCXX_STRING_VIEW 1
36 #pragma GCC system_header
38 #if __cplusplus >= 201703L
48 #if __cplusplus > 202002L
52 namespace std _GLIBCXX_VISIBILITY(default)
54 _GLIBCXX_BEGIN_NAMESPACE_VERSION
56 # define __cpp_lib_string_view 201803L
57 #if __cplusplus > 201703L
58 # define __cpp_lib_constexpr_string_view 201811L
63 __sv_check(
size_t __size,
size_t __pos,
const char* __s)
66 __throw_out_of_range_fmt(__N(
"%s: __pos (which is %zu) > __size "
67 "(which is %zu)"), __s, __pos, __size);
74 __sv_limit(
size_t __size,
size_t __pos,
size_t __off) noexcept
76 const bool __testoff = __off < __size - __pos;
77 return __testoff ? __off : __size - __pos;
98 template<
typename _CharT,
typename _Traits = std::
char_traits<_CharT>>
101 static_assert(!is_array_v<_CharT>);
102 static_assert(is_trivial_v<_CharT> && is_standard_layout_v<_CharT>);
103 static_assert(is_same_v<_CharT, typename _Traits::char_type>);
108 using traits_type = _Traits;
109 using value_type = _CharT;
110 using pointer = value_type*;
111 using const_pointer =
const value_type*;
112 using reference = value_type&;
113 using const_reference =
const value_type&;
114 using const_iterator =
const value_type*;
115 using iterator = const_iterator;
118 using size_type = size_t;
119 using difference_type = ptrdiff_t;
120 static constexpr size_type npos = size_type(-1);
126 : _M_len{0}, _M_str{
nullptr}
131 __attribute__((__nonnull__)) constexpr
133 : _M_len{traits_type::length(__str)},
139 : _M_len{__len}, _M_str{__str}
142 #if __cplusplus >= 202002L && __cpp_lib_concepts
143 template<contiguous_iterator _It, sized_sentinel_for<_It> _End>
144 requires same_as<iter_value_t<_It>, _CharT>
145 && (!convertible_to<_End, size_type>)
148 : _M_len(__last - __first), _M_str(std::to_address(__first))
151 #if __cplusplus > 202002L
152 template<
typename _Range,
typename _DRange = remove_cvref_t<_Range>>
153 requires (!is_same_v<_DRange, basic_string_view>)
154 && ranges::contiguous_range<_Range>
155 && ranges::sized_range<_Range>
156 && is_same_v<ranges::range_value_t<_Range>, _CharT>
157 && (!is_convertible_v<_Range, const _CharT*>)
158 && (!requires (_DRange& __d) {
159 __d.operator ::std::basic_string_view<_CharT, _Traits>();
161 && (!requires {
typename _DRange::traits_type; }
162 || is_same_v<typename _DRange::traits_type, _Traits>)
176 constexpr const_iterator
177 begin()
const noexcept
178 {
return this->_M_str; }
180 constexpr const_iterator
182 {
return this->_M_str + this->_M_len; }
184 constexpr const_iterator
185 cbegin()
const noexcept
186 {
return this->_M_str; }
188 constexpr const_iterator
189 cend()
const noexcept
190 {
return this->_M_str + this->_M_len; }
193 rbegin()
const noexcept
197 rend()
const noexcept
201 crbegin()
const noexcept
205 crend()
const noexcept
211 size()
const noexcept
212 {
return this->_M_len; }
215 length()
const noexcept
219 max_size()
const noexcept
221 return (npos -
sizeof(size_type) -
sizeof(
void*))
222 /
sizeof(value_type) / 4;
225 [[nodiscard]] constexpr
bool
226 empty()
const noexcept
227 {
return this->_M_len == 0; }
231 constexpr const_reference
232 operator[](size_type __pos)
const noexcept
234 __glibcxx_assert(__pos < this->_M_len);
235 return *(this->_M_str + __pos);
238 constexpr const_reference
239 at(size_type __pos)
const
242 __throw_out_of_range_fmt(__N(
"basic_string_view::at: __pos "
243 "(which is %zu) >= this->size() "
244 "(which is %zu)"), __pos, this->size());
245 return *(this->_M_str + __pos);
248 constexpr const_reference
249 front()
const noexcept
251 __glibcxx_assert(this->_M_len > 0);
252 return *this->_M_str;
255 constexpr const_reference
256 back()
const noexcept
258 __glibcxx_assert(this->_M_len > 0);
259 return *(this->_M_str + this->_M_len - 1);
262 constexpr const_pointer
263 data()
const noexcept
264 {
return this->_M_str; }
269 remove_prefix(size_type __n) noexcept
271 __glibcxx_assert(this->_M_len >= __n);
277 remove_suffix(size_type __n) noexcept
278 { this->_M_len -= __n; }
292 copy(_CharT* __str, size_type __n, size_type __pos = 0)
const
294 __glibcxx_requires_string_len(__str, __n);
295 __pos = std::__sv_check(size(), __pos,
"basic_string_view::copy");
296 const size_type __rlen =
std::min(__n, _M_len - __pos);
299 traits_type::copy(__str, data() + __pos, __rlen);
304 substr(size_type __pos = 0, size_type __n = npos)
const noexcept(
false)
306 __pos = std::__sv_check(size(), __pos,
"basic_string_view::substr");
307 const size_type __rlen =
std::min(__n, _M_len - __pos);
314 const size_type __rlen =
std::min(this->_M_len, __str._M_len);
315 int __ret = traits_type::compare(this->_M_str, __str._M_str, __rlen);
317 __ret = _S_compare(this->_M_len, __str._M_len);
323 {
return this->substr(__pos1, __n1).compare(__str); }
326 compare(size_type __pos1, size_type __n1,
329 return this->substr(__pos1, __n1).compare(__str.substr(__pos2, __n2));
332 __attribute__((__nonnull__)) constexpr
int
333 compare(
const _CharT* __str)
const noexcept
336 __attribute__((__nonnull__)) constexpr
int
337 compare(size_type __pos1, size_type __n1,
const _CharT* __str)
const
341 compare(size_type __pos1, size_type __n1,
342 const _CharT* __str, size_type __n2)
const noexcept(
false)
344 return this->substr(__pos1, __n1)
348 #if __cplusplus > 201703L
349 #define __cpp_lib_starts_ends_with 201711L
352 {
return this->substr(0, __x.size()) == __x; }
355 starts_with(_CharT __x)
const noexcept
356 {
return !this->empty() && traits_type::eq(this->front(), __x); }
359 starts_with(
const _CharT* __x)
const noexcept
365 return this->size() >= __x.size()
366 && this->compare(this->size() - __x.size(), npos, __x) == 0;
370 ends_with(_CharT __x)
const noexcept
371 {
return !this->empty() && traits_type::eq(this->back(), __x); }
374 ends_with(
const _CharT* __x)
const noexcept
378 #if __cplusplus > 202002L
379 #define __cpp_lib_string_contains 202011L
382 {
return this->find(__x) != npos; }
385 contains(_CharT __x)
const noexcept
386 {
return this->find(__x) != npos; }
389 contains(
const _CharT* __x)
const noexcept
390 {
return this->find(__x) != npos; }
397 {
return this->find(__str._M_str, __pos, __str._M_len); }
400 find(_CharT __c, size_type __pos = 0)
const noexcept;
403 find(
const _CharT* __str, size_type __pos, size_type __n)
const noexcept;
405 __attribute__((__nonnull__)) constexpr size_type
406 find(
const _CharT* __str, size_type __pos = 0)
const noexcept
407 {
return this->find(__str, __pos, traits_type::length(__str)); }
411 {
return this->rfind(__str._M_str, __pos, __str._M_len); }
414 rfind(_CharT __c, size_type __pos = npos)
const noexcept;
417 rfind(
const _CharT* __str, size_type __pos, size_type __n)
const noexcept;
419 __attribute__((__nonnull__)) constexpr size_type
420 rfind(
const _CharT* __str, size_type __pos = npos)
const noexcept
421 {
return this->rfind(__str, __pos, traits_type::length(__str)); }
425 {
return this->find_first_of(__str._M_str, __pos, __str._M_len); }
428 find_first_of(_CharT __c, size_type __pos = 0)
const noexcept
429 {
return this->find(__c, __pos); }
432 find_first_of(
const _CharT* __str, size_type __pos,
433 size_type __n)
const noexcept;
435 __attribute__((__nonnull__)) constexpr size_type
436 find_first_of(
const _CharT* __str, size_type __pos = 0)
const noexcept
437 {
return this->find_first_of(__str, __pos, traits_type::length(__str)); }
441 size_type __pos = npos)
const noexcept
442 {
return this->find_last_of(__str._M_str, __pos, __str._M_len); }
445 find_last_of(_CharT __c, size_type __pos=npos)
const noexcept
446 {
return this->rfind(__c, __pos); }
449 find_last_of(
const _CharT* __str, size_type __pos,
450 size_type __n)
const noexcept;
452 __attribute__((__nonnull__)) constexpr size_type
453 find_last_of(
const _CharT* __str, size_type __pos = npos)
const noexcept
454 {
return this->find_last_of(__str, __pos, traits_type::length(__str)); }
458 size_type __pos = 0)
const noexcept
459 {
return this->find_first_not_of(__str._M_str, __pos, __str._M_len); }
462 find_first_not_of(_CharT __c, size_type __pos = 0)
const noexcept;
465 find_first_not_of(
const _CharT* __str,
466 size_type __pos, size_type __n)
const noexcept;
468 __attribute__((__nonnull__)) constexpr size_type
469 find_first_not_of(
const _CharT* __str, size_type __pos = 0)
const noexcept
471 return this->find_first_not_of(__str, __pos,
472 traits_type::length(__str));
477 size_type __pos = npos)
const noexcept
478 {
return this->find_last_not_of(__str._M_str, __pos, __str._M_len); }
481 find_last_not_of(_CharT __c, size_type __pos = npos)
const noexcept;
484 find_last_not_of(
const _CharT* __str,
485 size_type __pos, size_type __n)
const noexcept;
487 __attribute__((__nonnull__)) constexpr size_type
488 find_last_not_of(
const _CharT* __str,
489 size_type __pos = npos)
const noexcept
491 return this->find_last_not_of(__str, __pos,
492 traits_type::length(__str));
498 _S_compare(size_type __n1, size_type __n2) noexcept
501 const difference_type __diff = __n1 - __n2;
502 if (__diff > __limits::__max)
503 return __limits::__max;
504 if (__diff < __limits::__min)
505 return __limits::__min;
506 return static_cast<int>(__diff);
510 const _CharT* _M_str;
513 #if __cplusplus > 201703L && __cpp_lib_concepts && __cpp_deduction_guides
514 template<contiguous_iterator _It, sized_sentinel_for<_It> _End>
517 #if __cplusplus > 202002L
518 template<ranges::contiguous_range _Range>
531 template<
typename _CharT,
typename _Traits>
535 {
return __x.size() == __y.size() && __x.compare(__y) == 0; }
537 template<
typename _CharT,
typename _Traits>
539 operator==(basic_string_view<_CharT, _Traits> __x,
540 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
542 {
return __x.size() == __y.size() && __x.compare(__y) == 0; }
544 #if __cpp_lib_three_way_comparison
545 template<
typename _CharT,
typename _Traits>
547 operator<=>(basic_string_view<_CharT, _Traits> __x,
548 basic_string_view<_CharT, _Traits> __y) noexcept
549 -> decltype(__detail::__char_traits_cmp_cat<_Traits>(0))
550 {
return __detail::__char_traits_cmp_cat<_Traits>(__x.compare(__y)); }
552 template<
typename _CharT,
typename _Traits>
554 operator<=>(basic_string_view<_CharT, _Traits> __x,
555 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
557 -> decltype(__detail::__char_traits_cmp_cat<_Traits>(0))
558 {
return __detail::__char_traits_cmp_cat<_Traits>(__x.compare(__y)); }
560 template<
typename _CharT,
typename _Traits>
562 operator==(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
563 basic_string_view<_CharT, _Traits> __y) noexcept
564 {
return __x.size() == __y.size() && __x.compare(__y) == 0; }
566 template<
typename _CharT,
typename _Traits>
568 operator!=(basic_string_view<_CharT, _Traits> __x,
569 basic_string_view<_CharT, _Traits> __y) noexcept
570 {
return !(__x == __y); }
572 template<
typename _CharT,
typename _Traits>
574 operator!=(basic_string_view<_CharT, _Traits> __x,
575 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
577 {
return !(__x == __y); }
579 template<
typename _CharT,
typename _Traits>
581 operator!=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
582 basic_string_view<_CharT, _Traits> __y) noexcept
583 {
return !(__x == __y); }
585 template<
typename _CharT,
typename _Traits>
587 operator< (basic_string_view<_CharT, _Traits> __x,
588 basic_string_view<_CharT, _Traits> __y) noexcept
589 {
return __x.compare(__y) < 0; }
591 template<
typename _CharT,
typename _Traits>
593 operator< (basic_string_view<_CharT, _Traits> __x,
594 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
596 {
return __x.compare(__y) < 0; }
598 template<
typename _CharT,
typename _Traits>
600 operator< (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
601 basic_string_view<_CharT, _Traits> __y) noexcept
602 {
return __x.compare(__y) < 0; }
604 template<
typename _CharT,
typename _Traits>
606 operator> (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 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
615 {
return __x.compare(__y) > 0; }
617 template<
typename _CharT,
typename _Traits>
619 operator> (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
620 basic_string_view<_CharT, _Traits> __y) noexcept
621 {
return __x.compare(__y) > 0; }
623 template<
typename _CharT,
typename _Traits>
625 operator<=(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 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
634 {
return __x.compare(__y) <= 0; }
636 template<
typename _CharT,
typename _Traits>
638 operator<=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
639 basic_string_view<_CharT, _Traits> __y) noexcept
640 {
return __x.compare(__y) <= 0; }
642 template<
typename _CharT,
typename _Traits>
644 operator>=(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 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
653 {
return __x.compare(__y) >= 0; }
655 template<
typename _CharT,
typename _Traits>
657 operator>=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
658 basic_string_view<_CharT, _Traits> __y) noexcept
659 {
return __x.compare(__y) >= 0; }
663 template<
typename _CharT,
typename _Traits>
664 inline basic_ostream<_CharT, _Traits>&
665 operator<<(basic_ostream<_CharT, _Traits>& __os,
666 basic_string_view<_CharT,_Traits> __str)
667 {
return __ostream_insert(__os, __str.data(), __str.size()); }
672 using string_view = basic_string_view<char>;
673 #ifdef _GLIBCXX_USE_WCHAR_T
674 using wstring_view = basic_string_view<wchar_t>;
676 #ifdef _GLIBCXX_USE_CHAR8_T
677 using u8string_view = basic_string_view<char8_t>;
679 using u16string_view = basic_string_view<char16_t>;
680 using u32string_view = basic_string_view<char32_t>;
684 template<
typename _Tp>
688 struct hash<string_view>
689 :
public __hash_base<size_t, string_view>
692 operator()(
const string_view& __str)
const noexcept
693 {
return std::_Hash_impl::hash(__str.data(), __str.length()); }
700 #ifdef _GLIBCXX_USE_WCHAR_T
702 struct hash<wstring_view>
703 :
public __hash_base<size_t, wstring_view>
706 operator()(
const wstring_view& __s)
const noexcept
707 {
return std::_Hash_impl::hash(__s.data(),
708 __s.length() *
sizeof(
wchar_t)); }
716 #ifdef _GLIBCXX_USE_CHAR8_T
718 struct hash<u8string_view>
719 :
public __hash_base<size_t, u8string_view>
722 operator()(
const u8string_view& __str)
const noexcept
723 {
return std::_Hash_impl::hash(__str.data(), __str.length()); }
732 struct hash<u16string_view>
733 :
public __hash_base<size_t, u16string_view>
736 operator()(
const u16string_view& __s)
const noexcept
737 {
return std::_Hash_impl::hash(__s.data(),
738 __s.length() *
sizeof(char16_t)); }
746 struct hash<u32string_view>
747 :
public __hash_base<size_t, u32string_view>
750 operator()(
const u32string_view& __s)
const noexcept
751 {
return std::_Hash_impl::hash(__s.data(),
752 __s.length() *
sizeof(char32_t)); }
759 inline namespace literals
761 inline namespace string_view_literals
763 #pragma GCC diagnostic push
764 #pragma GCC diagnostic ignored "-Wliteral-suffix"
765 inline constexpr basic_string_view<char>
766 operator""sv(
const char* __str,
size_t __len) noexcept
767 {
return basic_string_view<char>{__str, __len}; }
769 #ifdef _GLIBCXX_USE_WCHAR_T
770 inline constexpr basic_string_view<wchar_t>
771 operator""sv(
const wchar_t* __str,
size_t __len) noexcept
772 {
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 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.
constexpr auto size(const _Container &__cont) noexcept(noexcept(__cont.size())) -> decltype(__cont.size())
Return the size of a container.
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>.
A non-owning reference to a string.