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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) 1997-2018 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>
void
basic_string<_CharT, _Traits, _Alloc>::
swap(basic_string& __s) _GLIBCXX_NOEXCEPT
{
if (this == &__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_local_capacity + 1);
traits_type::copy(__s._M_local_buf, _M_local_buf,
_S_local_capacity + 1);
traits_type::copy(_M_local_buf, __tmp_data,
_S_local_capacity + 1);
}
else if (__s.length())
{
traits_type::copy(_M_local_buf, __s._M_local_buf,
_S_local_capacity + 1);
_M_length(__s.length());
__s._M_set_length(0);
return;
}
else if (length())
{
traits_type::copy(__s._M_local_buf, _M_local_buf,
_S_local_capacity + 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,
_S_local_capacity + 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_local_capacity + 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>
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>
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);
while (__beg != __end && __len < __capacity)
{
_M_data()[__len++] = *__beg;
++__beg;
}
__try
{
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);
}
_M_data()[__len++] = *__beg;
++__beg;
}
}
__catch(...)
{
_M_dispose();
__throw_exception_again;
}
_M_set_length(__len);
}
template<typename _CharT, typename _Traits, typename _Alloc>
template<typename _InIterator>
void
basic_string<_CharT, _Traits, _Alloc>::
_M_construct(_InIterator __beg, _InIterator __end,
std::forward_iterator_tag)
{
// NB: Not required, but considered best practice.
if (__gnu_cxx::__is_null_pointer(__beg) && __beg != __end)
std::__throw_logic_error(__N("basic_string::"
"_M_construct null not valid"));
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);
}
// Check for out_of_range and length_error exceptions.
__try
{ this->_S_copy_chars(_M_data(), __beg, __end); }
__catch(...)
{
_M_dispose();
__throw_exception_again;
}
_M_set_length(__dnew);
}
template<typename _CharT, typename _Traits, typename _Alloc>
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);
}
if (__n)
this->_S_assign(_M_data(), __n, __c);
_M_set_length(__n);
}
template<typename _CharT, typename _Traits, typename _Alloc>
void
basic_string<_CharT, _Traits, _Alloc>::
_M_assign(const basic_string& __str)
{
if (this != &__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>
void
basic_string<_CharT, _Traits, _Alloc>::
reserve(size_type __res)
{
// Make sure we don't shrink below the current size.
if (__res < length())
__res = length();
const size_type __capacity = capacity();
if (__res != __capacity)
{
if (__res > __capacity
|| __res > size_type(_S_local_capacity))
{
pointer __tmp = _M_create(__res, __capacity);
this->_S_copy(__tmp, _M_data(), length() + 1);
_M_dispose();
_M_data(__tmp);
_M_capacity(__res);
}
else if (!_M_is_local())
{
this->_S_copy(_M_local_data(), _M_data(), length() + 1);
_M_destroy(__capacity);
_M_data(_M_local_data());
}
}
}
template<typename _CharT, typename _Traits, typename _Alloc>
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>
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>
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>
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>
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)
{
const basic_string __s(__k1, __k2);
const size_type __n1 = __i2 - __i1;
return _M_replace(__i1 - begin(), __n1, __s._M_data(),
__s.size());
}
template<typename _CharT, typename _Traits, typename _Alloc>
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>
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 (_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)
this->_S_copy(__p, __s + __len2 - __len1, __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<typename _CharT, typename _Traits, typename _Alloc>
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;
}
#else // !_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>::
_Rep::_S_max_size = (((npos - sizeof(_Rep_base))/sizeof(_CharT)) - 1) / 4;
template<typename _CharT, typename _Traits, typename _Alloc>
const _CharT
basic_string<_CharT, _Traits, _Alloc>::
_Rep::_S_terminal = _CharT();
template<typename _CharT, typename _Traits, typename _Alloc>
const typename basic_string<_CharT, _Traits, _Alloc>::size_type
basic_string<_CharT, _Traits, _Alloc>::npos;
// Linker sets _S_empty_rep_storage to all 0s (one reference, empty string)
// at static init time (before static ctors are run).
template<typename _CharT, typename _Traits, typename _Alloc>
typename basic_string<_CharT, _Traits, _Alloc>::size_type
basic_string<_CharT, _Traits, _Alloc>::_Rep::_S_empty_rep_storage[
(sizeof(_Rep_base) + sizeof(_CharT) + sizeof(size_type) - 1) /
sizeof(size_type)];
// 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>
_CharT*
basic_string<_CharT, _Traits, _Alloc>::
_S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
input_iterator_tag)
{
#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
if (__beg == __end && __a == _Alloc())
return _S_empty_rep()._M_refdata();
#endif
// Avoid reallocation for common case.
_CharT __buf[128];
size_type __len = 0;
while (__beg != __end && __len < sizeof(__buf) / sizeof(_CharT))
{
__buf[__len++] = *__beg;
++__beg;
}
_Rep* __r = _Rep::_S_create(__len, size_type(0), __a);
_M_copy(__r->_M_refdata(), __buf, __len);
__try
{
while (__beg != __end)
{
if (__len == __r->_M_capacity)
{
// Allocate more space.
_Rep* __another = _Rep::_S_create(__len + 1, __len, __a);
_M_copy(__another->_M_refdata(), __r->_M_refdata(), __len);
__r->_M_destroy(__a);
__r = __another;
}
__r->_M_refdata()[__len++] = *__beg;
++__beg;
}
}
__catch(...)
{
__r->_M_destroy(__a);
__throw_exception_again;
}
__r->_M_set_length_and_sharable(__len);
return __r->_M_refdata();
}
template<typename _CharT, typename _Traits, typename _Alloc>
template <typename _InIterator>
_CharT*
basic_string<_CharT, _Traits, _Alloc>::
_S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
forward_iterator_tag)
{
#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
if (__beg == __end && __a == _Alloc())
return _S_empty_rep()._M_refdata();
#endif
// NB: Not required, but considered best practice.
if (__gnu_cxx::__is_null_pointer(__beg) && __beg != __end)
__throw_logic_error(__N("basic_string::_S_construct null not valid"));
const size_type __dnew = static_cast<size_type>(std::distance(__beg,
__end));
// Check for out_of_range and length_error exceptions.
_Rep* __r = _Rep::_S_create(__dnew, size_type(0), __a);
__try
{ _S_copy_chars(__r->_M_refdata(), __beg, __end); }
__catch(...)
{
__r->_M_destroy(__a);
__throw_exception_again;
}
__r->_M_set_length_and_sharable(__dnew);
return __r->_M_refdata();
}
template<typename _CharT, typename _Traits, typename _Alloc>
_CharT*
basic_string<_CharT, _Traits, _Alloc>::
_S_construct(size_type __n, _CharT __c, const _Alloc& __a)
{
#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
if (__n == 0 && __a == _Alloc())
return _S_empty_rep()._M_refdata();
#endif
// Check for out_of_range and length_error exceptions.
_Rep* __r = _Rep::_S_create(__n, size_type(0), __a);
if (__n)
_M_assign(__r->_M_refdata(), __n, __c);
__r->_M_set_length_and_sharable(__n);
return __r->_M_refdata();
}
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT, _Traits, _Alloc>::
basic_string(const basic_string& __str)
: _M_dataplus(__str._M_rep()->_M_grab(_Alloc(__str.get_allocator()),
__str.get_allocator()),
__str.get_allocator())
{ }
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT, _Traits, _Alloc>::
basic_string(const _Alloc& __a)
: _M_dataplus(_S_construct(size_type(), _CharT(), __a), __a)
{ }
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT, _Traits, _Alloc>::
basic_string(const basic_string& __str, size_type __pos, const _Alloc& __a)
: _M_dataplus(_S_construct(__str._M_data()
+ __str._M_check(__pos,
"basic_string::basic_string"),
__str._M_data() + __str._M_limit(__pos, npos)
+ __pos, __a), __a)
{ }
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT, _Traits, _Alloc>::
basic_string(const basic_string& __str, size_type __pos, size_type __n)
: _M_dataplus(_S_construct(__str._M_data()
+ __str._M_check(__pos,
"basic_string::basic_string"),
__str._M_data() + __str._M_limit(__pos, __n)
+ __pos, _Alloc()), _Alloc())
{ }
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT, _Traits, _Alloc>::
basic_string(const basic_string& __str, size_type __pos,
size_type __n, const _Alloc& __a)
: _M_dataplus(_S_construct(__str._M_data()
+ __str._M_check(__pos,
"basic_string::basic_string"),
__str._M_data() + __str._M_limit(__pos, __n)
+ __pos, __a), __a)
{ }
// TBD: DPG annotate
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT, _Traits, _Alloc>::
basic_string(const _CharT* __s, size_type __n, const _Alloc& __a)
: _M_dataplus(_S_construct(__s, __s + __n, __a), __a)
{ }
// TBD: DPG annotate
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT, _Traits, _Alloc>::
basic_string(const _CharT* __s, const _Alloc& __a)
: _M_dataplus(_S_construct(__s, __s ? __s + traits_type::length(__s) :
__s + npos, __a), __a)
{ }
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT, _Traits, _Alloc>::
basic_string(size_type __n, _CharT __c, const _Alloc& __a)
: _M_dataplus(_S_construct(__n, __c, __a), __a)
{ }
// TBD: DPG annotate
template<typename _CharT, typename _Traits, typename _Alloc>
template<typename _InputIterator>
basic_string<_CharT, _Traits, _Alloc>::
basic_string(_InputIterator __beg, _InputIterator __end, const _Alloc& __a)
: _M_dataplus(_S_construct(__beg, __end, __a), __a)
{ }
#if __cplusplus >= 201103L
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT, _Traits, _Alloc>::
basic_string(initializer_list<_CharT> __l, const _Alloc& __a)
: _M_dataplus(_S_construct(__l.begin(), __l.end(), __a), __a)
{ }
#endif
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT, _Traits, _Alloc>&
basic_string<_CharT, _Traits, _Alloc>::
assign(const basic_string& __str)
{
if (_M_rep() != __str._M_rep())
{
// XXX MT
const allocator_type __a = this->get_allocator();
_CharT* __tmp = __str._M_rep()->_M_grab(__a, __str.get_allocator());
_M_rep()->_M_dispose(__a);
_M_data(__tmp);
}
return *this;
}
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT, _Traits, _Alloc>&
basic_string<_CharT, _Traits, _Alloc>::
assign(const _CharT* __s, size_type __n)
{
__glibcxx_requires_string_len(__s, __n);
_M_check_length(this->size(), __n, "basic_string::assign");
if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
return _M_replace_safe(size_type(0), this->size(), __s, __n);
else
{
// Work in-place.
const size_type __pos = __s - _M_data();
if (__pos >= __n)
_M_copy(_M_data(), __s, __n);
else if (__pos)
_M_move(_M_data(), __s, __n);
_M_rep()->_M_set_length_and_sharable(__n);
return *this;
}
}
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT, _Traits, _Alloc>&
basic_string<_CharT, _Traits, _Alloc>::
append(size_type __n, _CharT __c)
{
if (__n)
{
_M_check_length(size_type(0), __n, "basic_string::append");
const size_type __len = __n + this->size();
if (__len > this->capacity() || _M_rep()->_M_is_shared())
this->reserve(__len);
_M_assign(_M_data() + this->size(), __n, __c);
_M_rep()->_M_set_length_and_sharable(__len);
}
return *this;
}
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT, _Traits, _Alloc>&
basic_string<_CharT, _Traits, _Alloc>::
append(const _CharT* __s, size_type __n)
{
__glibcxx_requires_string_len(__s, __n);
if (__n)
{
_M_check_length(size_type(0), __n, "basic_string::append");
const size_type __len = __n + this->size();
if (__len > this->capacity() || _M_rep()->_M_is_shared())
{
if (_M_disjunct(__s))
this->reserve(__len);
else
{
const size_type __off = __s - _M_data();
this->reserve(__len);
__s = _M_data() + __off;
}
}
_M_copy(_M_data() + this->size(), __s, __n);
_M_rep()->_M_set_length_and_sharable(__len);
}
return *this;
}
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT, _Traits, _Alloc>&
basic_string<_CharT, _Traits, _Alloc>::
append(const basic_string& __str)
{
const size_type __size = __str.size();
if (__size)
{
const size_type __len = __size + this->size();
if (__len > this->capacity() || _M_rep()->_M_is_shared())
this->reserve(__len);
_M_copy(_M_data() + this->size(), __str._M_data(), __size);
_M_rep()->_M_set_length_and_sharable(__len);
}
return *this;
}
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT, _Traits, _Alloc>&
basic_string<_CharT, _Traits, _Alloc>::
append(const basic_string& __str, size_type __pos, size_type __n)
{
__str._M_check(__pos, "basic_string::append");
__n = __str._M_limit(__pos, __n);
if (__n)
{
const size_type __len = __n + this->size();
if (__len > this->capacity() || _M_rep()->_M_is_shared())
this->reserve(__len);
_M_copy(_M_data() + this->size(), __str._M_data() + __pos, __n);
_M_rep()->_M_set_length_and_sharable(__len);
}
return *this;
}
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT, _Traits, _Alloc>&
basic_string<_CharT, _Traits, _Alloc>::
insert(size_type __pos, const _CharT* __s, size_type __n)
{
__glibcxx_requires_string_len(__s, __n);
_M_check(__pos, "basic_string::insert");
_M_check_length(size_type(0), __n, "basic_string::insert");
if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
return _M_replace_safe(__pos, size_type(0), __s, __n);
else
{
// Work in-place.
const size_type __off = __s - _M_data();
_M_mutate(__pos, 0, __n);
__s = _M_data() + __off;
_CharT* __p = _M_data() + __pos;
if (__s + __n <= __p)
_M_copy(__p, __s, __n);
else if (__s >= __p)
_M_copy(__p, __s + __n, __n);
else
{
const size_type __nleft = __p - __s;
_M_copy(__p, __s, __nleft);
_M_copy(__p + __nleft, __p + __n, __n - __nleft);
}
return *this;
}
}
template<typename _CharT, typename _Traits, typename _Alloc>
typename basic_string<_CharT, _Traits, _Alloc>::iterator
basic_string<_CharT, _Traits, _Alloc>::
erase(iterator __first, iterator __last)
{
_GLIBCXX_DEBUG_PEDASSERT(__first >= _M_ibegin() && __first <= __last
&& __last <= _M_iend());
// NB: This isn't just an optimization (bail out early when
// there is nothing to do, really), it's also a correctness
// issue vs MT, see libstdc++/40518.
const size_type __size = __last - __first;
if (__size)
{
const size_type __pos = __first - _M_ibegin();
_M_mutate(__pos, __size, size_type(0));
_M_rep()->_M_set_leaked();
return iterator(_M_data() + __pos);
}
else
return __first;
}
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT, _Traits, _Alloc>&
basic_string<_CharT, _Traits, _Alloc>::
replace(size_type __pos, size_type __n1, const _CharT* __s,
size_type __n2)
{
__glibcxx_requires_string_len(__s, __n2);
_M_check(__pos, "basic_string::replace");
__n1 = _M_limit(__pos, __n1);
_M_check_length(__n1, __n2, "basic_string::replace");
bool __left;
if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
return _M_replace_safe(__pos, __n1, __s, __n2);
else if ((__left = __s + __n2 <= _M_data() + __pos)
|| _M_data() + __pos + __n1 <= __s)
{
// Work in-place: non-overlapping case.
size_type __off = __s - _M_data();
__left ? __off : (__off += __n2 - __n1);
_M_mutate(__pos, __n1, __n2);
_M_copy(_M_data() + __pos, _M_data() + __off, __n2);
return *this;
}
else
{
// Todo: overlapping case.
const basic_string __tmp(__s, __n2);
return _M_replace_safe(__pos, __n1, __tmp._M_data(), __n2);
}
}
template<typename _CharT, typename _Traits, typename _Alloc>
void
basic_string<_CharT, _Traits, _Alloc>::_Rep::
_M_destroy(const _Alloc& __a) throw ()
{
const size_type __size = sizeof(_Rep_base) +
(this->_M_capacity + 1) * sizeof(_CharT);
_Raw_bytes_alloc(__a).deallocate(reinterpret_cast<char*>(this), __size);
}
template<typename _CharT, typename _Traits, typename _Alloc>
void
basic_string<_CharT, _Traits, _Alloc>::
_M_leak_hard()
{
#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
if (_M_rep() == &_S_empty_rep())
return;
#endif
if (_M_rep()->_M_is_shared())
_M_mutate(0, 0, 0);
_M_rep()->_M_set_leaked();
}
template<typename _CharT, typename _Traits, typename _Alloc>
void
basic_string<_CharT, _Traits, _Alloc>::
_M_mutate(size_type __pos, size_type __len1, size_type __len2)
{
const size_type __old_size = this->size();
const size_type __new_size = __old_size + __len2 - __len1;
const size_type __how_much = __old_size - __pos - __len1;
if (__new_size > this->capacity() || _M_rep()->_M_is_shared())
{
// Must reallocate.
const allocator_type __a = get_allocator();
_Rep* __r = _Rep::_S_create(__new_size, this->capacity(), __a);
if (__pos)
_M_copy(__r->_M_refdata(), _M_data(), __pos);
if (__how_much)
_M_copy(__r->_M_refdata() + __pos + __len2,
_M_data() + __pos + __len1, __how_much);
_M_rep()->_M_dispose(__a);
_M_data(__r->_M_refdata());
}
else if (__how_much && __len1 != __len2)
{
// Work in-place.
_M_move(_M_data() + __pos + __len2,
_M_data() + __pos + __len1, __how_much);
}
_M_rep()->_M_set_length_and_sharable(__new_size);
}
template<typename _CharT, typename _Traits, typename _Alloc>
void
basic_string<_CharT, _Traits, _Alloc>::
reserve(size_type __res)
{
if (__res != this->capacity() || _M_rep()->_M_is_shared())
{
// Make sure we don't shrink below the current size
if (__res < this->size())
__res = this->size();
const allocator_type __a = get_allocator();
_CharT* __tmp = _M_rep()->_M_clone(__a, __res - this->size());
_M_rep()->_M_dispose(__a);
_M_data(__tmp);
}
}
template<typename _CharT, typename _Traits, typename _Alloc>
void
basic_string<_CharT, _Traits, _Alloc>::
swap(basic_string& __s)
_GLIBCXX_NOEXCEPT_IF(allocator_traits<_Alloc>::is_always_equal::value)
{
if (_M_rep()->_M_is_leaked())
_M_rep()->_M_set_sharable();
if (__s._M_rep()->_M_is_leaked())
__s._M_rep()->_M_set_sharable();
if (this->get_allocator() == __s.get_allocator())
{
_CharT* __tmp = _M_data();
_M_data(__s._M_data());
__s._M_data(__tmp);
}
// The code below can usually be optimized away.
else
{
const basic_string __tmp1(_M_ibegin(), _M_iend(),
__s.get_allocator());
const basic_string __tmp2(__s._M_ibegin(), __s._M_iend(),
this->get_allocator());
*this = __tmp2;
__s = __tmp1;
}
}
template<typename _CharT, typename _Traits, typename _Alloc>
typename basic_string<_CharT, _Traits, _Alloc>::_Rep*
basic_string<_CharT, _Traits, _Alloc>::_Rep::
_S_create(size_type __capacity, size_type __old_capacity,
const _Alloc& __alloc)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS