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basic_string.tcc (_S_construct(_InIterator, _InIterator, const _Alloc&, input_iterator_tag)): Simplify the double loop, streamline.

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2004-01-30  Paolo Carlini  <pcarlini@suse.de>

	* include/bits/basic_string.tcc (_S_construct(_InIterator,
	_InIterator, const _Alloc&, input_iterator_tag)): Simplify
	the double loop, streamline.

	* include/bits/basic_string.tcc: Very minor tweaks.

From-SVN: r76937
This commit is contained in:
Paolo Carlini 2004-01-30 09:58:45 +00:00 • committed by Paolo Carlini
parent 57116d8d9f
commit 690495b0fc
2 changed files with 32 additions and 40 deletions
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8
libstdc++-v3/ChangeLog
View file

@ -1,3 +1,11 @@
2004-01-30 Paolo Carlini <pcarlini@suse.de>
* include/bits/basic_string.tcc (_S_construct(_InIterator,
_InIterator, const _Alloc&, input_iterator_tag)): Simplify
the double loop, streamline.
* include/bits/basic_string.tcc: Very minor tweaks.
2004-01-30 Loren J. Rittle <ljrittle@acm.org>
* scripts/check_performance: Only compile with $THREAD_FLAG

64
libstdc++-v3/include/bits/basic_string.tcc
View file

@ -92,45 +92,29 @@ namespace std
return _S_empty_rep()._M_refdata();
// Avoid reallocation for common case.
_CharT __buf[100];
size_type __i = 0;
while (__beg != __end && __i < sizeof(__buf) / sizeof(_CharT))
size_type __len = 0;
while (__beg != __end && __len < sizeof(__buf) / sizeof(_CharT))
{
__buf[__i++] = *__beg;
++__beg;
__buf[__len++] = *__beg;
++__beg;
}
_Rep* __r = _Rep::_S_create(__i, size_type(0), __a);
traits_type::copy(__r->_M_refdata(), __buf, __i);
__r->_M_length = __i;
_Rep* __r = _Rep::_S_create(__len, size_type(0), __a);
traits_type::copy(__r->_M_refdata(), __buf, __len);
try
{
// NB: this loop looks precisely this way because
// it avoids comparing __beg != __end any more
// than strictly necessary; != might be expensive!
for (;;)
while (__beg != __end)
{
_CharT* __p = __r->_M_refdata() + __r->_M_length;
_CharT* __last = __r->_M_refdata() + __r->_M_capacity;
for (;;)
if (__len == __r->_M_capacity)
{
if (__beg == __end)
{
__r->_M_length = __p - __r->_M_refdata();
*__p = _Rep::_S_terminal; // grrr.
return __r->_M_refdata();
}
if (__p == __last)
break;
*__p++ = *__beg;
++__beg;
// Allocate more space.
_Rep* __another = _Rep::_S_create(__len + 1, __len, __a);
traits_type::copy(__another->_M_refdata(),
__r->_M_refdata(), __len);
__r->_M_destroy(__a);
__r = __another;
}
// Allocate more space.
const size_type __len = __r->_M_capacity;
_Rep* __another = _Rep::_S_create(__len + 1, __len, __a);
traits_type::copy(__another->_M_refdata(),
__r->_M_refdata(), __len);
__r->_M_destroy(__a);
__r = __another;
__r->_M_length = __len;
__r->_M_refdata()[__len++] = *__beg;
++__beg;
}
}
catch(...)
@ -138,7 +122,9 @@ namespace std
__r->_M_destroy(__a);
__throw_exception_again;
}
return 0;
__r->_M_length = __len;
__r->_M_refdata()[__len] = _Rep::_S_terminal; // grrr.
return __r->_M_refdata();
}
template<typename _CharT, typename _Traits, typename _Alloc>
@ -167,7 +153,6 @@ namespace std
__throw_exception_again;
}
__r->_M_length = __dnew;
__r->_M_refdata()[__dnew] = _Rep::_S_terminal; // grrr.
return __r->_M_refdata();
}
@ -209,9 +194,8 @@ namespace std
: _M_dataplus(_S_construct(__str._M_data()
+ __str._M_check(__pos,
"basic_string::basic_string"),
__str._M_data() + __pos
+ __str._M_limit(__pos, __n),
_Alloc()), _Alloc())
__str._M_data() + __str._M_limit(__pos, __n)
+ __pos, _Alloc()), _Alloc())
{ }
template<typename _CharT, typename _Traits, typename _Alloc>
@ -221,8 +205,8 @@ namespace std
: _M_dataplus(_S_construct(__str._M_data()
+ __str._M_check(__pos,
"basic_string::basic_string"),
__str._M_data() + __pos
+ __str._M_limit(__pos, __n), __a), __a)
__str._M_data() + __str._M_limit(__pos, __n)
+ __pos, __a), __a)
{ }
// TBD: DPG annotate
@ -262,7 +246,7 @@ namespace std
if (_M_rep() != __str._M_rep())
{
// XXX MT
allocator_type __a = this->get_allocator();
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);