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basic_string.tcc
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basic_string.tcc
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// Components for manipulating sequences of characters -*- C++ -*-
// Copyright (C) 1997-2023 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
// <http://www.gnu.org/licenses/>.
/** @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 <bits/cxxabi_forced.h>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
#if _GLIBCXX_USE_CXX11_ABI
template<typename _CharT, typename _Traits, typename _Alloc>
const typename basic_string<_CharT, _Traits, _Alloc>::size_type
basic_string<_CharT, _Traits, _Alloc>::npos;
template<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
template<typename _InIterator>
_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<typename _CharT, typename _Traits, typename _Alloc>
template<typename _InIterator>
_GLIBCXX20_CONSTEXPR
void
basic_string<_CharT, _Traits, _Alloc>::
_M_construct(_InIterator __beg, _InIterator __end,
std::forward_iterator_tag)
{
size_type __dnew = static_cast<size_type>(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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
template<typename _InputIterator>
_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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
__attribute__((__noinline__, __noclone__, __cold__)) void
basic_string<_CharT, _Traits, _Alloc>::
_M_replace_cold(pointer __p, size_type __len1, const _CharT* __s,
const size_type __len2, const size_type __how_much)
{
// 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);
}
}
}
template<typename _CharT, typename _Traits, typename _Alloc>
_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 (__builtin_expect(_M_disjunct(__s), true))
{
if (__how_much && __len1 != __len2)
this->_S_move(__p + __len2, __p + __len1, __how_much);
if (__len2)
this->_S_copy(__p, __s, __len2);
}
else
_M_replace_cold(__p, __len1, __s, __len2, __how_much);
}
else
this->_M_mutate(__pos, __len1, __s, __len2);
this->_M_set_length(__new_size);
return *this;
}
template<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
template<typename _Operation>
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};
auto __r = std::move(__op)(auto(__p), auto(__n));
static_assert(ranges::__detail::__is_integer_like<decltype(__r)>);
_GLIBCXX_DEBUG_ASSERT(__r >= 0 && __r <= __n);
__term._M_r = size_type(__r);
if (__term._M_r > __n)
__builtin_unreachable();
}
#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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
_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<typename _CharT, typename _Traits, typename _Alloc>
_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;
}
#undef _GLIBCXX_STRING_CONSTEXPR
// 21.3.7.9 basic_string::getline and operators
template<typename _CharT, typename _Traits, typename _Alloc>
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<typename _CharT, typename _Traits, typename _Alloc>
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<char>;
# 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<char>::size_type
basic_string<char>::_Rep::_S_empty_rep_storage[];
# elif _GLIBCXX_EXTERN_TEMPLATE > 0
// Export _M_replace_cold even for C++20.
extern template void
basic_string<char>::_M_replace_cold(char *, size_type, const char*,
const size_type, const size_type);
# endif
extern template
basic_istream<char>&
operator>>(basic_istream<char>&, string&);
extern template
basic_ostream<char>&
operator<<(basic_ostream<char>&, const string&);
extern template
basic_istream<char>&
getline(basic_istream<char>&, string&, char);
extern template
basic_istream<char>&
getline(basic_istream<char>&, string&);
#ifdef _GLIBCXX_USE_WCHAR_T
# if __cplusplus <= 201703L && _GLIBCXX_EXTERN_TEMPLATE > 0
extern template class basic_string<wchar_t>;
# elif ! _GLIBCXX_USE_CXX11_ABI
extern template basic_string<wchar_t>::size_type
basic_string<wchar_t>::_Rep::_S_empty_rep_storage[];
# elif _GLIBCXX_EXTERN_TEMPLATE > 0
// Export _M_replace_cold even for C++20.
extern template void
basic_string<wchar_t>::_M_replace_cold(wchar_t*, size_type, const wchar_t*,