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basic_string.h (operator+(basic_string<>&&, basic_string<>&&)): Optimize better.

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2010-12-19  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/bits/basic_string.h (operator+(basic_string<>&&,
	basic_string<>&&)): Optimize better.
	* include/ext/vstring.h (operator+(__versa_string<>&&,
	__versa_string<>&)): Likewise.

From-SVN: r168061
This commit is contained in:
Paolo Carlini 2010-12-19 15:53:44 +00:00 committed by Paolo Carlini
parent 5bfe5df3d8
commit 37a68925ce
3 changed files with 23 additions and 4 deletions
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7
libstdc++-v3/ChangeLog
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@ -1,3 +1,10 @@
2010-12-19 Paolo Carlini <paolo.carlini@oracle.com>
* include/bits/basic_string.h (operator+(basic_string<>&&,
basic_string<>&&)): Optimize better.
* include/ext/vstring.h (operator+(__versa_string<>&&,
__versa_string<>&)): Likewise.
2010-12-19 Paolo Carlini <paolo.carlini@oracle.com>
* testsuite/21_strings/basic_string/operators/char/4.cc: New.

12
libstdc++-v3/include/bits/basic_string.h
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@ -2380,7 +2380,13 @@ _GLIBCXX_BEGIN_NAMESPACE(std)
inline basic_string<_CharT, _Traits, _Alloc>
operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
basic_string<_CharT, _Traits, _Alloc>&& __rhs)
{ return std::move(__lhs.append(__rhs)); }
{
const auto __size = __lhs.size() + __rhs.size();
const bool __cond = (__size > __lhs.capacity()
&& __size <= __rhs.capacity());
return __cond ? std::move(__rhs.insert(0, __lhs))
: std::move(__lhs.append(__rhs));
}
template<typename _CharT, typename _Traits, typename _Alloc>
inline basic_string<_CharT, _Traits, _Alloc>
@ -2390,8 +2396,8 @@ _GLIBCXX_BEGIN_NAMESPACE(std)
template<typename _CharT, typename _Traits, typename _Alloc>
inline basic_string<_CharT, _Traits, _Alloc>
operator+(_CharT __lhs, basic_string<_CharT,
_Traits, _Alloc>&& __rhs)
operator+(_CharT __lhs,
basic_string<_CharT, _Traits, _Alloc>&& __rhs)
{ return std::move(__rhs.insert(0, 1, __lhs)); }
template<typename _CharT, typename _Traits, typename _Alloc>

8
libstdc++-v3/include/ext/vstring.h
View File

@ -2118,7 +2118,13 @@ _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
inline __versa_string<_CharT, _Traits, _Alloc, _Base>
operator+(__versa_string<_CharT, _Traits, _Alloc, _Base>&& __lhs,
__versa_string<_CharT, _Traits, _Alloc, _Base>&& __rhs)
{ return std::move(__lhs.append(__rhs)); }
{
const auto __size = __lhs.size() + __rhs.size();
const bool __cond = (__size > __lhs.capacity()
&& __size <= __rhs.capacity());
return __cond ? std::move(__rhs.insert(0, __lhs))
: std::move(__lhs.append(__rhs));
}
template<typename _CharT, typename _Traits, typename _Alloc,
template <typename, typename, typename> class _Base>