34 #ifndef _GLIBCXX_EXPERIMENTAL_STRING_VIEW
35 #define _GLIBCXX_EXPERIMENTAL_STRING_VIEW 1
37 #pragma GCC system_header
39 #if __cplusplus >= 201402L
46 namespace std _GLIBCXX_VISIBILITY(default)
48 _GLIBCXX_BEGIN_NAMESPACE_VERSION
50 namespace experimental
52 inline namespace fundamentals_v1
54 #define __cpp_lib_experimental_string_view 201411
75 template<
typename _CharT,
typename _Traits = std::
char_traits<_CharT>>
81 using traits_type = _Traits;
82 using value_type = _CharT;
83 using pointer = _CharT*;
84 using const_pointer =
const _CharT*;
85 using reference = _CharT&;
86 using const_reference =
const _CharT&;
87 using const_iterator =
const _CharT*;
88 using iterator = const_iterator;
91 using size_type = size_t;
92 using difference_type = ptrdiff_t;
93 static constexpr size_type npos = size_type(-1);
99 : _M_len{0}, _M_str{
nullptr}
104 template<
typename _Allocator>
106 _Allocator>& __str) noexcept
107 : _M_len{__str.length()}, _M_str{__str.data()}
111 : _M_len{__str ==
nullptr ? 0 : traits_type::length(__str)},
115 constexpr basic_string_view(
const _CharT* __str, size_type __len)
121 operator=(
const basic_string_view&) noexcept =
default;
125 constexpr const_iterator
126 begin()
const noexcept
127 {
return this->_M_str; }
129 constexpr const_iterator
131 {
return this->_M_str + this->_M_len; }
133 constexpr const_iterator
134 cbegin()
const noexcept
135 {
return this->_M_str; }
137 constexpr const_iterator
138 cend()
const noexcept
139 {
return this->_M_str + this->_M_len; }
142 rbegin()
const noexcept
146 rend()
const noexcept
150 crbegin()
const noexcept
154 crend()
const noexcept
160 size()
const noexcept
161 {
return this->_M_len; }
164 length()
const noexcept
168 max_size()
const noexcept
170 return (npos -
sizeof(size_type) -
sizeof(
void*))
171 /
sizeof(value_type) / 4;
174 _GLIBCXX_NODISCARD constexpr
bool
175 empty()
const noexcept
176 {
return this->_M_len == 0; }
180 constexpr
const _CharT&
181 operator[](size_type __pos)
const
183 __glibcxx_assert(__pos < this->_M_len);
184 return *(this->_M_str + __pos);
187 constexpr
const _CharT&
188 at(size_type __pos)
const
190 return __pos < this->_M_len
191 ? *(this->_M_str + __pos)
192 : (__throw_out_of_range_fmt(__N(
"basic_string_view::at: __pos "
193 "(which is %zu) >= this->size() "
195 __pos, this->size()),
199 constexpr
const _CharT&
202 __glibcxx_assert(this->_M_len > 0);
203 return *this->_M_str;
206 constexpr
const _CharT&
209 __glibcxx_assert(this->_M_len > 0);
210 return *(this->_M_str + this->_M_len - 1);
213 constexpr
const _CharT*
214 data()
const noexcept
215 {
return this->_M_str; }
220 remove_prefix(size_type __n)
222 __glibcxx_assert(this->_M_len >= __n);
228 remove_suffix(size_type __n)
229 { this->_M_len -= __n; }
232 swap(basic_string_view& __sv) noexcept
242 template<
typename _Allocator>
245 return { this->_M_str, this->_M_len };
248 template<
typename _Allocator = std::allocator<_CharT>>
250 to_string(
const _Allocator& __alloc = _Allocator())
const
252 return { this->_M_str, this->_M_len, __alloc };
256 copy(_CharT* __str, size_type __n, size_type __pos = 0)
const
258 __glibcxx_requires_string_len(__str, __n);
259 if (__pos > this->_M_len)
260 __throw_out_of_range_fmt(__N(
"basic_string_view::copy: __pos "
261 "(which is %zu) > this->size() "
263 __pos, this->size());
264 size_type __rlen{
std::min(__n, size_type{this->_M_len - __pos})};
265 for (
auto __begin = this->_M_str + __pos,
266 __end = __begin + __rlen; __begin != __end;)
267 *__str++ = *__begin++;
274 constexpr basic_string_view
275 substr(size_type __pos = 0, size_type __n = npos)
const
277 return __pos <= this->_M_len
278 ? basic_string_view{this->_M_str + __pos,
279 std::min(__n, size_type{this->_M_len - __pos})}
280 : (__throw_out_of_range_fmt(__N(
"basic_string_view::substr: __pos "
281 "(which is %zu) > this->size() "
283 __pos, this->size()), basic_string_view{});
287 compare(basic_string_view __str)
const noexcept
289 int __ret = traits_type::compare(this->_M_str, __str._M_str,
290 std::min(this->_M_len, __str._M_len));
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
303 {
return this->substr(__pos1, __n1).compare(__str.substr(__pos2, __n2)); }
306 compare(
const _CharT* __str)
const noexcept
307 {
return this->compare(basic_string_view{__str}); }
310 compare(size_type __pos1, size_type __n1,
const _CharT* __str)
const
311 {
return this->substr(__pos1, __n1).compare(basic_string_view{__str}); }
314 compare(size_type __pos1, size_type __n1,
315 const _CharT* __str, size_type __n2)
const
317 return this->substr(__pos1, __n1)
318 .compare(basic_string_view(__str, __n2));
322 find(basic_string_view __str, size_type __pos = 0)
const noexcept
323 {
return this->find(__str._M_str, __pos, __str._M_len); }
326 find(_CharT __c, size_type __pos=0)
const noexcept;
329 find(
const _CharT* __str, size_type __pos, size_type __n)
const noexcept;
332 find(
const _CharT* __str, size_type __pos=0)
const noexcept
333 {
return this->find(__str, __pos, traits_type::length(__str)); }
336 rfind(basic_string_view __str, size_type __pos = npos)
const noexcept
337 {
return this->rfind(__str._M_str, __pos, __str._M_len); }
340 rfind(_CharT __c, size_type __pos = npos)
const noexcept;
343 rfind(
const _CharT* __str, size_type __pos, size_type __n)
const noexcept;
346 rfind(
const _CharT* __str, size_type __pos = npos)
const noexcept
347 {
return this->rfind(__str, __pos, traits_type::length(__str)); }
350 find_first_of(basic_string_view __str, size_type __pos = 0)
const noexcept
351 {
return this->find_first_of(__str._M_str, __pos, __str._M_len); }
354 find_first_of(_CharT __c, size_type __pos = 0)
const noexcept
355 {
return this->find(__c, __pos); }
358 find_first_of(
const _CharT* __str, size_type __pos, size_type __n)
const;
361 find_first_of(
const _CharT* __str, size_type __pos = 0)
const noexcept
362 {
return this->find_first_of(__str, __pos, traits_type::length(__str)); }
365 find_last_of(basic_string_view __str,
366 size_type __pos = npos)
const noexcept
367 {
return this->find_last_of(__str._M_str, __pos, __str._M_len); }
370 find_last_of(_CharT __c, size_type __pos=npos)
const noexcept
371 {
return this->rfind(__c, __pos); }
374 find_last_of(
const _CharT* __str, size_type __pos, size_type __n)
const;
377 find_last_of(
const _CharT* __str, size_type __pos = npos)
const noexcept
378 {
return this->find_last_of(__str, __pos, traits_type::length(__str)); }
381 find_first_not_of(basic_string_view __str,
382 size_type __pos = 0)
const noexcept
383 {
return this->find_first_not_of(__str._M_str, __pos, __str._M_len); }
386 find_first_not_of(_CharT __c, size_type __pos = 0)
const noexcept;
389 find_first_not_of(
const _CharT* __str,
390 size_type __pos, size_type __n)
const;
393 find_first_not_of(
const _CharT* __str, size_type __pos = 0)
const noexcept
395 return this->find_first_not_of(__str, __pos,
396 traits_type::length(__str));
400 find_last_not_of(basic_string_view __str,
401 size_type __pos = npos)
const noexcept
402 {
return this->find_last_not_of(__str._M_str, __pos, __str._M_len); }
405 find_last_not_of(_CharT __c, size_type __pos = npos)
const noexcept;
408 find_last_not_of(
const _CharT* __str,
409 size_type __pos, size_type __n)
const;
412 find_last_not_of(
const _CharT* __str,
413 size_type __pos = npos)
const noexcept
415 return this->find_last_not_of(__str, __pos,
416 traits_type::length(__str));
422 _S_compare(size_type __n1, size_type __n2) noexcept
428 :
static_cast<int>(difference_type(__n1 - __n2));
432 const _CharT* _M_str;
442 template<
typename _CharT,
typename _Traits>
446 {
return __x.size() == __y.size() && __x.compare(__y) == 0; }
448 template<
typename _CharT,
typename _Traits>
453 {
return __x.size() == __y.size() && __x.compare(__y) == 0; }
455 template<
typename _CharT,
typename _Traits>
459 {
return __x.size() == __y.size() && __x.compare(__y) == 0; }
461 template<
typename _CharT,
typename _Traits>
465 {
return !(__x == __y); }
467 template<
typename _CharT,
typename _Traits>
472 {
return !(__x == __y); }
474 template<
typename _CharT,
typename _Traits>
478 {
return !(__x == __y); }
480 template<
typename _CharT,
typename _Traits>
482 operator< (basic_string_view<_CharT, _Traits> __x,
484 {
return __x.compare(__y) < 0; }
486 template<
typename _CharT,
typename _Traits>
488 operator< (basic_string_view<_CharT, _Traits> __x,
489 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
491 {
return __x.compare(__y) < 0; }
493 template<
typename _CharT,
typename _Traits>
495 operator< (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
497 {
return __x.compare(__y) < 0; }
499 template<
typename _CharT,
typename _Traits>
503 {
return __x.compare(__y) > 0; }
505 template<
typename _CharT,
typename _Traits>
510 {
return __x.compare(__y) > 0; }
512 template<
typename _CharT,
typename _Traits>
516 {
return __x.compare(__y) > 0; }
518 template<
typename _CharT,
typename _Traits>
520 operator<=(basic_string_view<_CharT, _Traits> __x,
522 {
return __x.compare(__y) <= 0; }
524 template<
typename _CharT,
typename _Traits>
526 operator<=(basic_string_view<_CharT, _Traits> __x,
527 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
529 {
return __x.compare(__y) <= 0; }
531 template<
typename _CharT,
typename _Traits>
533 operator<=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
535 {
return __x.compare(__y) <= 0; }
537 template<
typename _CharT,
typename _Traits>
541 {
return __x.compare(__y) >= 0; }
543 template<
typename _CharT,
typename _Traits>
548 {
return __x.compare(__y) >= 0; }
550 template<
typename _CharT,
typename _Traits>
554 {
return __x.compare(__y) >= 0; }
557 template<
typename _CharT,
typename _Traits>
559 operator<<(basic_ostream<_CharT, _Traits>& __os,
561 {
return __ostream_insert(__os, __str.data(), __str.size()); }
567 #ifdef _GLIBCXX_USE_WCHAR_T
570 #ifdef _GLIBCXX_USE_CHAR8_T
580 template<
typename _Tp>
585 :
public __hash_base<size_t, experimental::string_view>
588 operator()(
const experimental::string_view& __str)
const noexcept
589 {
return std::_Hash_impl::hash(__str.data(), __str.length()); }
596 #ifdef _GLIBCXX_USE_WCHAR_T
598 struct hash<experimental::wstring_view>
599 :
public __hash_base<size_t, wstring>
602 operator()(
const experimental::wstring_view& __s)
const noexcept
603 {
return std::_Hash_impl::hash(__s.data(),
604 __s.length() *
sizeof(wchar_t)); }
608 struct __is_fast_hash<hash<experimental::wstring_view>> :
std::false_type
612 #ifdef _GLIBCXX_USE_CHAR8_T
614 struct hash<experimental::u8string_view>
615 :
public __hash_base<size_t, experimental::u8string_view>
618 operator()(
const experimental::u8string_view& __s)
const noexcept
619 {
return std::_Hash_impl::hash(__s.data(), __s.length()); }
623 struct __is_fast_hash<hash<experimental::u8string_view>> :
std::false_type
628 struct hash<experimental::u16string_view>
629 :
public __hash_base<size_t, experimental::u16string_view>
632 operator()(
const experimental::u16string_view& __s)
const noexcept
633 {
return std::_Hash_impl::hash(__s.data(),
634 __s.length() *
sizeof(char16_t)); }
638 struct __is_fast_hash<hash<experimental::u16string_view>> :
std::false_type
642 struct hash<experimental::u32string_view>
643 :
public __hash_base<size_t, experimental::u32string_view>
646 operator()(
const experimental::u32string_view& __s)
const noexcept
647 {
return std::_Hash_impl::hash(__s.data(),
648 __s.length() *
sizeof(char32_t)); }
652 struct __is_fast_hash<hash<experimental::u32string_view>> :
std::false_type
655 namespace experimental
658 inline namespace literals
660 inline namespace string_view_literals
662 #pragma GCC diagnostic push
663 #pragma GCC diagnostic ignored "-Wliteral-suffix"
664 inline constexpr basic_string_view<char>
665 operator""sv(
const char* __str,
size_t __len) noexcept
666 {
return basic_string_view<char>{__str, __len}; }
668 #ifdef _GLIBCXX_USE_WCHAR_T
669 inline constexpr basic_string_view<wchar_t>
670 operator""sv(
const wchar_t* __str,
size_t __len) noexcept
671 {
return basic_string_view<wchar_t>{__str, __len}; }
674 #ifdef _GLIBCXX_USE_CHAR8_T
675 inline constexpr basic_string_view<char8_t>
676 operator""sv(
const char8_t* __str,
size_t __len) noexcept
677 {
return basic_string_view<char8_t>{__str, __len}; }
680 inline constexpr basic_string_view<char16_t>
681 operator""sv(
const char16_t* __str,
size_t __len) noexcept
682 {
return basic_string_view<char16_t>{__str, __len}; }
684 inline constexpr basic_string_view<char32_t>
685 operator""sv(
const char32_t* __str,
size_t __len) noexcept
686 {
return basic_string_view<char32_t>{__str, __len}; }
687 #pragma GCC diagnostic pop
692 #if __cpp_lib_concepts
696 template<
typename _CharT,
typename _Traits>
697 inline constexpr
bool
698 enable_borrowed_range<experimental::basic_string_view<_CharT, _Traits>>
702 template<
typename _CharT,
typename _Traits>
703 inline constexpr
bool
704 enable_view<experimental::basic_string_view<_CharT, _Traits>> =
true;
708 _GLIBCXX_END_NAMESPACE_VERSION
713 #endif // __cplusplus <= 201103L
715 #endif // _GLIBCXX_EXPERIMENTAL_STRING_VIEW
Primary class template hash.
A non-owning reference to a string.
static constexpr _Tp max() noexcept
constexpr const _Tp & min(const _Tp &, const _Tp &)
This does what you think it does.
A non-owning reference to a string.
Managing sequences of characters and character-like objects.
static constexpr _Tp min() noexcept
Template class basic_ostream.