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Overloaded __pad_and_output on ostreambuf_iterator and in this overload call sputn instead of dereferencing the iterator which calls sputc. This is intended to be purely a performance optimization, especially for clients who may have overloaded the virtual function xsputn.

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@164241 91177308-0d34-0410-b5e6-96231b3b80d8
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Howard Hinnant
2012-09-19 19:14:15 +00:00
parent 7eb9f1e3a3
commit a585de645c
2 changed files with 54 additions and 0 deletions
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46
include/locale
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@@ -1587,6 +1587,52 @@ __pad_and_output(_OutputIterator __s,
return __s;
}
template <class _CharT, class _Traits>
_LIBCPP_HIDDEN
ostreambuf_iterator<_CharT, _Traits>
__pad_and_output(ostreambuf_iterator<_CharT, _Traits> __s,
const _CharT* __ob, const _CharT* __op, const _CharT* __oe,
ios_base& __iob, _CharT __fl)
{
if (__s.__sbuf_ == nullptr)
return __s;
streamsize __sz = __oe - __ob;
streamsize __ns = __iob.width();
if (__ns > __sz)
__ns -= __sz;
else
__ns = 0;
streamsize __np = __op - __ob;
if (__np > 0)
{
if (__s.__sbuf_->sputn(__ob, __np) != __np)
{
__s.__sbuf_ = nullptr;
return __s;
}
}
if (__ns > 0)
{
basic_string<_CharT, _Traits> __sp(__ns, __fl);
if (__s.__sbuf_->sputn(__sp.data(), __ns) != __ns)
{
__s.__sbuf_ = nullptr;
return __s;
}
}
__np = __oe - __op;
if (__np > 0)
{
if (__s.__sbuf_->sputn(__op, __np) != __np)
{
__s.__sbuf_ = nullptr;
return __s;
}
}
__iob.width(0);
return __s;
}
template <class _CharT, class _OutputIterator>
_OutputIterator
num_put<_CharT, _OutputIterator>::do_put(iter_type __s, ios_base& __iob,