// Components for manipulating sequences of characters -*- C++ -*- // Copyright (C) 1997-2022 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // . /** @file bits/basic_string.tcc * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{string} */ // // ISO C++ 14882: 21 Strings library // // Written by Jason Merrill based upon the specification by Takanori Adachi // in ANSI X3J16/94-0013R2. Rewritten by Nathan Myers to ISO-14882. // Non-reference-counted implementation written by Paolo Carlini and // updated by Jonathan Wakely for ISO-14882-2011. #ifndef _BASIC_STRING_TCC #define _BASIC_STRING_TCC 1 #pragma GCC system_header #include namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION #if _GLIBCXX_USE_CXX11_ABI template const typename basic_string<_CharT, _Traits, _Alloc>::size_type basic_string<_CharT, _Traits, _Alloc>::npos; template _GLIBCXX20_CONSTEXPR void basic_string<_CharT, _Traits, _Alloc>:: swap(basic_string& __s) _GLIBCXX_NOEXCEPT { if (this == std::__addressof(__s)) return; _Alloc_traits::_S_on_swap(_M_get_allocator(), __s._M_get_allocator()); if (_M_is_local()) if (__s._M_is_local()) { if (length() && __s.length()) { _CharT __tmp_data[_S_local_capacity + 1]; traits_type::copy(__tmp_data, __s._M_local_buf, __s.length() + 1); traits_type::copy(__s._M_local_buf, _M_local_buf, length() + 1); traits_type::copy(_M_local_buf, __tmp_data, __s.length() + 1); } else if (__s.length()) { traits_type::copy(_M_local_buf, __s._M_local_buf, __s.length() + 1); _M_length(__s.length()); __s._M_set_length(0); return; } else if (length()) { traits_type::copy(__s._M_local_buf, _M_local_buf, length() + 1); __s._M_length(length()); _M_set_length(0); return; } } else { const size_type __tmp_capacity = __s._M_allocated_capacity; traits_type::copy(__s._M_local_buf, _M_local_buf, length() + 1); _M_data(__s._M_data()); __s._M_data(__s._M_local_buf); _M_capacity(__tmp_capacity); } else { const size_type __tmp_capacity = _M_allocated_capacity; if (__s._M_is_local()) { traits_type::copy(_M_local_buf, __s._M_local_buf, __s.length() + 1); __s._M_data(_M_data()); _M_data(_M_local_buf); } else { pointer __tmp_ptr = _M_data(); _M_data(__s._M_data()); __s._M_data(__tmp_ptr); _M_capacity(__s._M_allocated_capacity); } __s._M_capacity(__tmp_capacity); } const size_type __tmp_length = length(); _M_length(__s.length()); __s._M_length(__tmp_length); } template _GLIBCXX20_CONSTEXPR typename basic_string<_CharT, _Traits, _Alloc>::pointer basic_string<_CharT, _Traits, _Alloc>:: _M_create(size_type& __capacity, size_type __old_capacity) { // _GLIBCXX_RESOLVE_LIB_DEFECTS // 83. String::npos vs. string::max_size() if (__capacity > max_size()) std::__throw_length_error(__N("basic_string::_M_create")); // The below implements an exponential growth policy, necessary to // meet amortized linear time requirements of the library: see // http://gcc.gnu.org/ml/libstdc++/2001-07/msg00085.html. if (__capacity > __old_capacity && __capacity < 2 * __old_capacity) { __capacity = 2 * __old_capacity; // Never allocate a string bigger than max_size. if (__capacity > max_size()) __capacity = max_size(); } // NB: Need an array of char_type[__capacity], plus a terminating // null char_type() element. return _Alloc_traits::allocate(_M_get_allocator(), __capacity + 1); } // NB: This is the special case for Input Iterators, used in // istreambuf_iterators, etc. // Input Iterators have a cost structure very different from // pointers, calling for a different coding style. template template _GLIBCXX20_CONSTEXPR void basic_string<_CharT, _Traits, _Alloc>:: _M_construct(_InIterator __beg, _InIterator __end, std::input_iterator_tag) { size_type __len = 0; size_type __capacity = size_type(_S_local_capacity); pointer __p = _M_use_local_data(); while (__beg != __end && __len < __capacity) { __p[__len++] = *__beg; ++__beg; } struct _Guard { _GLIBCXX20_CONSTEXPR explicit _Guard(basic_string* __s) : _M_guarded(__s) { } _GLIBCXX20_CONSTEXPR ~_Guard() { if (_M_guarded) _M_guarded->_M_dispose(); } basic_string* _M_guarded; } __guard(this); while (__beg != __end) { if (__len == __capacity) { // Allocate more space. __capacity = __len + 1; pointer __another = _M_create(__capacity, __len); this->_S_copy(__another, _M_data(), __len); _M_dispose(); _M_data(__another); _M_capacity(__capacity); } traits_type::assign(_M_data()[__len++], *__beg); ++__beg; } __guard._M_guarded = 0; _M_set_length(__len); } template template _GLIBCXX20_CONSTEXPR void basic_string<_CharT, _Traits, _Alloc>:: _M_construct(_InIterator __beg, _InIterator __end, std::forward_iterator_tag) { size_type __dnew = static_cast(std::distance(__beg, __end)); if (__dnew > size_type(_S_local_capacity)) { _M_data(_M_create(__dnew, size_type(0))); _M_capacity(__dnew); } else _M_use_local_data(); // Check for out_of_range and length_error exceptions. struct _Guard { _GLIBCXX20_CONSTEXPR explicit _Guard(basic_string* __s) : _M_guarded(__s) { } _GLIBCXX20_CONSTEXPR ~_Guard() { if (_M_guarded) _M_guarded->_M_dispose(); } basic_string* _M_guarded; } __guard(this); this->_S_copy_chars(_M_data(), __beg, __end); __guard._M_guarded = 0; _M_set_length(__dnew); } template _GLIBCXX20_CONSTEXPR void basic_string<_CharT, _Traits, _Alloc>:: _M_construct(size_type __n, _CharT __c) { if (__n > size_type(_S_local_capacity)) { _M_data(_M_create(__n, size_type(0))); _M_capacity(__n); } else _M_use_local_data(); if (__n) this->_S_assign(_M_data(), __n, __c); _M_set_length(__n); } template _GLIBCXX20_CONSTEXPR void basic_string<_CharT, _Traits, _Alloc>:: _M_assign(const basic_string& __str) { if (this != std::__addressof(__str)) { const size_type __rsize = __str.length(); const size_type __capacity = capacity(); if (__rsize > __capacity) { size_type __new_capacity = __rsize; pointer __tmp = _M_create(__new_capacity, __capacity); _M_dispose(); _M_data(__tmp); _M_capacity(__new_capacity); } if (__rsize) this->_S_copy(_M_data(), __str._M_data(), __rsize); _M_set_length(__rsize); } } template _GLIBCXX20_CONSTEXPR void basic_string<_CharT, _Traits, _Alloc>:: reserve(size_type __res) { const size_type __capacity = capacity(); // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2968. Inconsistencies between basic_string reserve and // vector/unordered_map/unordered_set reserve functions // P0966 reserve should not shrink if (__res <= __capacity) return; pointer __tmp = _M_create(__res, __capacity); this->_S_copy(__tmp, _M_data(), length() + 1); _M_dispose(); _M_data(__tmp); _M_capacity(__res); } template _GLIBCXX20_CONSTEXPR void basic_string<_CharT, _Traits, _Alloc>:: _M_mutate(size_type __pos, size_type __len1, const _CharT* __s, size_type __len2) { const size_type __how_much = length() - __pos - __len1; size_type __new_capacity = length() + __len2 - __len1; pointer __r = _M_create(__new_capacity, capacity()); if (__pos) this->_S_copy(__r, _M_data(), __pos); if (__s && __len2) this->_S_copy(__r + __pos, __s, __len2); if (__how_much) this->_S_copy(__r + __pos + __len2, _M_data() + __pos + __len1, __how_much); _M_dispose(); _M_data(__r); _M_capacity(__new_capacity); } template _GLIBCXX20_CONSTEXPR void basic_string<_CharT, _Traits, _Alloc>:: _M_erase(size_type __pos, size_type __n) { const size_type __how_much = length() - __pos - __n; if (__how_much && __n) this->_S_move(_M_data() + __pos, _M_data() + __pos + __n, __how_much); _M_set_length(length() - __n); } template _GLIBCXX20_CONSTEXPR void basic_string<_CharT, _Traits, _Alloc>:: reserve() { if (_M_is_local()) return; const size_type __length = length(); const size_type __capacity = _M_allocated_capacity; if (__length <= size_type(_S_local_capacity)) { this->_S_copy(_M_use_local_data(), _M_data(), __length + 1); _M_destroy(__capacity); _M_data(_M_local_data()); } #if __cpp_exceptions else if (__length < __capacity) try { pointer __tmp = _Alloc_traits::allocate(_M_get_allocator(), __length + 1); this->_S_copy(__tmp, _M_data(), __length + 1); _M_dispose(); _M_data(__tmp); _M_capacity(__length); } catch (const __cxxabiv1::__forced_unwind&) { throw; } catch (...) { /* swallow the exception */ } #endif } template _GLIBCXX20_CONSTEXPR void basic_string<_CharT, _Traits, _Alloc>:: resize(size_type __n, _CharT __c) { const size_type __size = this->size(); if (__size < __n) this->append(__n - __size, __c); else if (__n < __size) this->_M_set_length(__n); } template _GLIBCXX20_CONSTEXPR basic_string<_CharT, _Traits, _Alloc>& basic_string<_CharT, _Traits, _Alloc>:: _M_append(const _CharT* __s, size_type __n) { const size_type __len = __n + this->size(); if (__len <= this->capacity()) { if (__n) this->_S_copy(this->_M_data() + this->size(), __s, __n); } else this->_M_mutate(this->size(), size_type(0), __s, __n); this->_M_set_length(__len); return *this; } template template _GLIBCXX20_CONSTEXPR basic_string<_CharT, _Traits, _Alloc>& basic_string<_CharT, _Traits, _Alloc>:: _M_replace_dispatch(const_iterator __i1, const_iterator __i2, _InputIterator __k1, _InputIterator __k2, std::__false_type) { // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2788. unintentionally require a default constructible allocator const basic_string __s(__k1, __k2, this->get_allocator()); const size_type __n1 = __i2 - __i1; return _M_replace(__i1 - begin(), __n1, __s._M_data(), __s.size()); } template _GLIBCXX20_CONSTEXPR basic_string<_CharT, _Traits, _Alloc>& basic_string<_CharT, _Traits, _Alloc>:: _M_replace_aux(size_type __pos1, size_type __n1, size_type __n2, _CharT __c) { _M_check_length(__n1, __n2, "basic_string::_M_replace_aux"); const size_type __old_size = this->size(); const size_type __new_size = __old_size + __n2 - __n1; if (__new_size <= this->capacity()) { pointer __p = this->_M_data() + __pos1; const size_type __how_much = __old_size - __pos1 - __n1; if (__how_much && __n1 != __n2) this->_S_move(__p + __n2, __p + __n1, __how_much); } else this->_M_mutate(__pos1, __n1, 0, __n2); if (__n2) this->_S_assign(this->_M_data() + __pos1, __n2, __c); this->_M_set_length(__new_size); return *this; } template _GLIBCXX20_CONSTEXPR basic_string<_CharT, _Traits, _Alloc>& basic_string<_CharT, _Traits, _Alloc>:: _M_replace(size_type __pos, size_type __len1, const _CharT* __s, const size_type __len2) { _M_check_length(__len1, __len2, "basic_string::_M_replace"); const size_type __old_size = this->size(); const size_type __new_size = __old_size + __len2 - __len1; if (__new_size <= this->capacity()) { pointer __p = this->_M_data() + __pos; const size_type __how_much = __old_size - __pos - __len1; #if __cpp_lib_is_constant_evaluated if (std::is_constant_evaluated()) { auto __newp = _Alloc_traits::allocate(_M_get_allocator(), __new_size); _S_copy(__newp, this->_M_data(), __pos); _S_copy(__newp + __pos, __s, __len2); _S_copy(__newp + __pos + __len2, __p + __len1, __how_much); _S_copy(this->_M_data(), __newp, __new_size); this->_M_get_allocator().deallocate(__newp, __new_size); } else #endif if (_M_disjunct(__s)) { if (__how_much && __len1 != __len2) this->_S_move(__p + __len2, __p + __len1, __how_much); if (__len2) this->_S_copy(__p, __s, __len2); } else { // Work in-place. if (__len2 && __len2 <= __len1) this->_S_move(__p, __s, __len2); if (__how_much && __len1 != __len2) this->_S_move(__p + __len2, __p + __len1, __how_much); if (__len2 > __len1) { if (__s + __len2 <= __p + __len1) this->_S_move(__p, __s, __len2); else if (__s >= __p + __len1) { // Hint to middle end that __p and __s overlap // (PR 98465). const size_type __poff = (__s - __p) + (__len2 - __len1); this->_S_copy(__p, __p + __poff, __len2); } else { const size_type __nleft = (__p + __len1) - __s; this->_S_move(__p, __s, __nleft); this->_S_copy(__p + __nleft, __p + __len2, __len2 - __nleft); } } } } else this->_M_mutate(__pos, __len1, __s, __len2); this->_M_set_length(__new_size); return *this; } template _GLIBCXX20_CONSTEXPR typename basic_string<_CharT, _Traits, _Alloc>::size_type basic_string<_CharT, _Traits, _Alloc>:: copy(_CharT* __s, size_type __n, size_type __pos) const { _M_check(__pos, "basic_string::copy"); __n = _M_limit(__pos, __n); __glibcxx_requires_string_len(__s, __n); if (__n) _S_copy(__s, _M_data() + __pos, __n); // 21.3.5.7 par 3: do not append null. (good.) return __n; } #if __cplusplus > 202002L template template constexpr void basic_string<_CharT, _Traits, _Alloc>:: resize_and_overwrite(size_type __n, _Operation __op) { const size_type __capacity = capacity(); _CharT* __p; if (__n > __capacity) { __p = _M_create(__n, __capacity); this->_S_copy(__p, _M_data(), length()); // exclude trailing null #if __cpp_lib_is_constant_evaluated if (std::is_constant_evaluated()) traits_type::assign(__p + length(), __n - length(), _CharT()); #endif _M_dispose(); _M_data(__p); _M_capacity(__n); } else __p = _M_data(); struct _Terminator { constexpr ~_Terminator() { _M_this->_M_set_length(_M_r); } basic_string* _M_this; size_type _M_r; }; _Terminator __term{this}; const size_type __n2 [[maybe_unused]] = __n; __term._M_r = std::move(__op)(__p, __n); _GLIBCXX_DEBUG_ASSERT(__term._M_r >= 0 && __term._M_r <= __n2); } #endif // C++23 #endif // _GLIBCXX_USE_CXX11_ABI #if __cpp_lib_constexpr_string >= 201907L # define _GLIBCXX_STRING_CONSTEXPR constexpr #else # define _GLIBCXX_STRING_CONSTEXPR #endif template _GLIBCXX20_CONSTEXPR basic_string<_CharT, _Traits, _Alloc> operator+(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs) { __glibcxx_requires_string(__lhs); typedef basic_string<_CharT, _Traits, _Alloc> __string_type; typedef typename __string_type::size_type __size_type; typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template rebind<_CharT>::other _Char_alloc_type; typedef __gnu_cxx::__alloc_traits<_Char_alloc_type> _Alloc_traits; const __size_type __len = _Traits::length(__lhs); __string_type __str(_Alloc_traits::_S_select_on_copy( __rhs.get_allocator())); __str.reserve(__len + __rhs.size()); __str.append(__lhs, __len); __str.append(__rhs); return __str; } template _GLIBCXX20_CONSTEXPR basic_string<_CharT, _Traits, _Alloc> operator+(_CharT __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs) { typedef basic_string<_CharT, _Traits, _Alloc> __string_type; typedef typename __string_type::size_type __size_type; typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template rebind<_CharT>::other _Char_alloc_type; typedef __gnu_cxx::__alloc_traits<_Char_alloc_type> _Alloc_traits; __string_type __str(_Alloc_traits::_S_select_on_copy( __rhs.get_allocator())); const __size_type __len = __rhs.size(); __str.reserve(__len + 1); __str.append(__size_type(1), __lhs); __str.append(__rhs); return __str; } template _GLIBCXX_STRING_CONSTEXPR typename basic_string<_CharT, _Traits, _Alloc>::size_type basic_string<_CharT, _Traits, _Alloc>:: find(const _CharT* __s, size_type __pos, size_type __n) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_string_len(__s, __n); const size_type __size = this->size(); if (__n == 0) return __pos <= __size ? __pos : npos; if (__pos >= __size) return npos; const _CharT __elem0 = __s[0]; const _CharT* const __data = data(); const _CharT* __first = __data + __pos; const _CharT* const __last = __data + __size; size_type __len = __size - __pos; while (__len >= __n) { // Find the first occurrence of __elem0: __first = traits_type::find(__first, __len - __n + 1, __elem0); if (!__first) return npos; // Compare the full strings from the first occurrence of __elem0. // We already know that __first[0] == __s[0] but compare them again // anyway because __s is probably aligned, which helps memcmp. if (traits_type::compare(__first, __s, __n) == 0) return __first - __data; __len = __last - ++__first; } return npos; } template _GLIBCXX_STRING_CONSTEXPR typename basic_string<_CharT, _Traits, _Alloc>::size_type basic_string<_CharT, _Traits, _Alloc>:: find(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT { size_type __ret = npos; const size_type __size = this->size(); if (__pos < __size) { const _CharT* __data = _M_data(); const size_type __n = __size - __pos; const _CharT* __p = traits_type::find(__data + __pos, __n, __c); if (__p) __ret = __p - __data; } return __ret; } template _GLIBCXX_STRING_CONSTEXPR typename basic_string<_CharT, _Traits, _Alloc>::size_type basic_string<_CharT, _Traits, _Alloc>:: rfind(const _CharT* __s, size_type __pos, size_type __n) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_string_len(__s, __n); const size_type __size = this->size(); if (__n <= __size) { __pos = std::min(size_type(__size - __n), __pos); const _CharT* __data = _M_data(); do { if (traits_type::compare(__data + __pos, __s, __n) == 0) return __pos; } while (__pos-- > 0); } return npos; } template _GLIBCXX_STRING_CONSTEXPR typename basic_string<_CharT, _Traits, _Alloc>::size_type basic_string<_CharT, _Traits, _Alloc>:: rfind(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT { size_type __size = this->size(); if (__size) { if (--__size > __pos) __size = __pos; for (++__size; __size-- > 0; ) if (traits_type::eq(_M_data()[__size], __c)) return __size; } return npos; } template _GLIBCXX_STRING_CONSTEXPR typename basic_string<_CharT, _Traits, _Alloc>::size_type basic_string<_CharT, _Traits, _Alloc>:: find_first_of(const _CharT* __s, size_type __pos, size_type __n) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_string_len(__s, __n); for (; __n && __pos < this->size(); ++__pos) { const _CharT* __p = traits_type::find(__s, __n, _M_data()[__pos]); if (__p) return __pos; } return npos; } template _GLIBCXX_STRING_CONSTEXPR typename basic_string<_CharT, _Traits, _Alloc>::size_type basic_string<_CharT, _Traits, _Alloc>:: find_last_of(const _CharT* __s, size_type __pos, size_type __n) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_string_len(__s, __n); size_type __size = this->size(); if (__size && __n) { if (--__size > __pos) __size = __pos; do { if (traits_type::find(__s, __n, _M_data()[__size])) return __size; } while (__size-- != 0); } return npos; } template _GLIBCXX_STRING_CONSTEXPR typename basic_string<_CharT, _Traits, _Alloc>::size_type basic_string<_CharT, _Traits, _Alloc>:: find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_string_len(__s, __n); for (; __pos < this->size(); ++__pos) if (!traits_type::find(__s, __n, _M_data()[__pos])) return __pos; return npos; } template _GLIBCXX_STRING_CONSTEXPR typename basic_string<_CharT, _Traits, _Alloc>::size_type basic_string<_CharT, _Traits, _Alloc>:: find_first_not_of(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT { for (; __pos < this->size(); ++__pos) if (!traits_type::eq(_M_data()[__pos], __c)) return __pos; return npos; } template _GLIBCXX_STRING_CONSTEXPR typename basic_string<_CharT, _Traits, _Alloc>::size_type basic_string<_CharT, _Traits, _Alloc>:: find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_string_len(__s, __n); size_type __size = this->size(); if (__size) { if (--__size > __pos) __size = __pos; do { if (!traits_type::find(__s, __n, _M_data()[__size])) return __size; } while (__size--); } return npos; } template _GLIBCXX_STRING_CONSTEXPR typename basic_string<_CharT, _Traits, _Alloc>::size_type basic_string<_CharT, _Traits, _Alloc>:: find_last_not_of(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT { size_type __size = this->size(); if (__size) { if (--__size > __pos) __size = __pos; do { if (!traits_type::eq(_M_data()[__size], __c)) return __size; } while (__size--); } return npos; } template _GLIBCXX_STRING_CONSTEXPR int basic_string<_CharT, _Traits, _Alloc>:: compare(size_type __pos, size_type __n, const basic_string& __str) const { _M_check(__pos, "basic_string::compare"); __n = _M_limit(__pos, __n); const size_type __osize = __str.size(); const size_type __len = std::min(__n, __osize); int __r = traits_type::compare(_M_data() + __pos, __str.data(), __len); if (!__r) __r = _S_compare(__n, __osize); return __r; } template _GLIBCXX_STRING_CONSTEXPR int basic_string<_CharT, _Traits, _Alloc>:: compare(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2) const { _M_check(__pos1, "basic_string::compare"); __str._M_check(__pos2, "basic_string::compare"); __n1 = _M_limit(__pos1, __n1); __n2 = __str._M_limit(__pos2, __n2); const size_type __len = std::min(__n1, __n2); int __r = traits_type::compare(_M_data() + __pos1, __str.data() + __pos2, __len); if (!__r) __r = _S_compare(__n1, __n2); return __r; } template _GLIBCXX_STRING_CONSTEXPR int basic_string<_CharT, _Traits, _Alloc>:: compare(const _CharT* __s) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_string(__s); const size_type __size = this->size(); const size_type __osize = traits_type::length(__s); const size_type __len = std::min(__size, __osize); int __r = traits_type::compare(_M_data(), __s, __len); if (!__r) __r = _S_compare(__size, __osize); return __r; } template _GLIBCXX_STRING_CONSTEXPR int basic_string <_CharT, _Traits, _Alloc>:: compare(size_type __pos, size_type __n1, const _CharT* __s) const { __glibcxx_requires_string(__s); _M_check(__pos, "basic_string::compare"); __n1 = _M_limit(__pos, __n1); const size_type __osize = traits_type::length(__s); const size_type __len = std::min(__n1, __osize); int __r = traits_type::compare(_M_data() + __pos, __s, __len); if (!__r) __r = _S_compare(__n1, __osize); return __r; } template _GLIBCXX_STRING_CONSTEXPR int basic_string <_CharT, _Traits, _Alloc>:: compare(size_type __pos, size_type __n1, const _CharT* __s, size_type __n2) const { __glibcxx_requires_string_len(__s, __n2); _M_check(__pos, "basic_string::compare"); __n1 = _M_limit(__pos, __n1); const size_type __len = std::min(__n1, __n2); int __r = traits_type::compare(_M_data() + __pos, __s, __len); if (!__r) __r = _S_compare(__n1, __n2); return __r; } #undef _GLIBCXX_STRING_CONSTEXPR // 21.3.7.9 basic_string::getline and operators template basic_istream<_CharT, _Traits>& operator>>(basic_istream<_CharT, _Traits>& __in, basic_string<_CharT, _Traits, _Alloc>& __str) { typedef basic_istream<_CharT, _Traits> __istream_type; typedef basic_string<_CharT, _Traits, _Alloc> __string_type; typedef typename __istream_type::ios_base __ios_base; typedef typename __istream_type::int_type __int_type; typedef typename __string_type::size_type __size_type; typedef ctype<_CharT> __ctype_type; typedef typename __ctype_type::ctype_base __ctype_base; __size_type __extracted = 0; typename __ios_base::iostate __err = __ios_base::goodbit; typename __istream_type::sentry __cerb(__in, false); if (__cerb) { __try { // Avoid reallocation for common case. __str.erase(); _CharT __buf[128]; __size_type __len = 0; const streamsize __w = __in.width(); const __size_type __n = __w > 0 ? static_cast<__size_type>(__w) : __str.max_size(); const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc()); const __int_type __eof = _Traits::eof(); __int_type __c = __in.rdbuf()->sgetc(); while (__extracted < __n && !_Traits::eq_int_type(__c, __eof) && !__ct.is(__ctype_base::space, _Traits::to_char_type(__c))) { if (__len == sizeof(__buf) / sizeof(_CharT)) { __str.append(__buf, sizeof(__buf) / sizeof(_CharT)); __len = 0; } __buf[__len++] = _Traits::to_char_type(__c); ++__extracted; __c = __in.rdbuf()->snextc(); } __str.append(__buf, __len); if (__extracted < __n && _Traits::eq_int_type(__c, __eof)) __err |= __ios_base::eofbit; __in.width(0); } __catch(__cxxabiv1::__forced_unwind&) { __in._M_setstate(__ios_base::badbit); __throw_exception_again; } __catch(...) { // _GLIBCXX_RESOLVE_LIB_DEFECTS // 91. Description of operator>> and getline() for string<> // might cause endless loop __in._M_setstate(__ios_base::badbit); } } // 211. operator>>(istream&, string&) doesn't set failbit if (!__extracted) __err |= __ios_base::failbit; if (__err) __in.setstate(__err); return __in; } template basic_istream<_CharT, _Traits>& getline(basic_istream<_CharT, _Traits>& __in, basic_string<_CharT, _Traits, _Alloc>& __str, _CharT __delim) { typedef basic_istream<_CharT, _Traits> __istream_type; typedef basic_string<_CharT, _Traits, _Alloc> __string_type; typedef typename __istream_type::ios_base __ios_base; typedef typename __istream_type::int_type __int_type; typedef typename __string_type::size_type __size_type; __size_type __extracted = 0; const __size_type __n = __str.max_size(); typename __ios_base::iostate __err = __ios_base::goodbit; typename __istream_type::sentry __cerb(__in, true); if (__cerb) { __try { __str.erase(); const __int_type __idelim = _Traits::to_int_type(__delim); const __int_type __eof = _Traits::eof(); __int_type __c = __in.rdbuf()->sgetc(); while (__extracted < __n && !_Traits::eq_int_type(__c, __eof) && !_Traits::eq_int_type(__c, __idelim)) { __str += _Traits::to_char_type(__c); ++__extracted; __c = __in.rdbuf()->snextc(); } if (_Traits::eq_int_type(__c, __eof)) __err |= __ios_base::eofbit; else if (_Traits::eq_int_type(__c, __idelim)) { ++__extracted; __in.rdbuf()->sbumpc(); } else __err |= __ios_base::failbit; } __catch(__cxxabiv1::__forced_unwind&) { __in._M_setstate(__ios_base::badbit); __throw_exception_again; } __catch(...) { // _GLIBCXX_RESOLVE_LIB_DEFECTS // 91. Description of operator>> and getline() for string<> // might cause endless loop __in._M_setstate(__ios_base::badbit); } } if (!__extracted) __err |= __ios_base::failbit; if (__err) __in.setstate(__err); return __in; } // Inhibit implicit instantiations for required instantiations, // which are defined via explicit instantiations elsewhere. #if _GLIBCXX_EXTERN_TEMPLATE // The explicit instantiation definitions in src/c++11/string-inst.cc and // src/c++17/string-inst.cc only instantiate the members required for C++17 // and earlier standards (so not C++20's starts_with and ends_with). // Suppress the explicit instantiation declarations for C++20, so C++20 // code will implicitly instantiate std::string and std::wstring as needed. # if __cplusplus <= 201703L && _GLIBCXX_EXTERN_TEMPLATE > 0 extern template class basic_string; # elif ! _GLIBCXX_USE_CXX11_ABI // Still need to prevent implicit instantiation of the COW empty rep, // to ensure the definition in libstdc++.so is unique (PR 86138). extern template basic_string::size_type basic_string::_Rep::_S_empty_rep_storage[]; # endif extern template basic_istream& operator>>(basic_istream&, string&); extern template basic_ostream& operator<<(basic_ostream&, const string&); extern template basic_istream& getline(basic_istream&, string&, char); extern template basic_istream& getline(basic_istream&, string&); #ifdef _GLIBCXX_USE_WCHAR_T # if __cplusplus <= 201703L && _GLIBCXX_EXTERN_TEMPLATE > 0 extern template class basic_string; # elif ! _GLIBCXX_USE_CXX11_ABI extern template basic_string::size_type basic_string::_Rep::_S_empty_rep_storage[]; # endif extern template basic_istream& operator>>(basic_istream&, wstring&); extern template basic_ostream& operator<<(basic_ostream&, const wstring&); extern template basic_istream& getline(basic_istream&, wstring&, wchar_t); extern template basic_istream& getline(basic_istream&, wstring&); #endif // _GLIBCXX_USE_WCHAR_T #endif // _GLIBCXX_EXTERN_TEMPLATE _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif