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Stop accessing/comparing singular iterators.

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Fixes #4708.

[SVN r65800]
This commit is contained in:
John Maddock
2010-10-07 07:23:58 +00:00
parent 6fd55b0510
commit 27eb8e46ff
1 changed files with 11 additions and 8 deletions
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19
include/boost/regex/v4/sub_match.hpp
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@ -56,7 +56,7 @@ struct sub_match : public std::pair<BidiIterator, BidiIterator>
template <class T, class A> template <class T, class A>
operator std::basic_string<value_type, T, A> ()const operator std::basic_string<value_type, T, A> ()const
{ {
return std::basic_string<value_type, T, A>(this->first, this->second); return matched ? std::basic_string<value_type, T, A>(this->first, this->second) : std::basic_string<value_type, T, A>();
} }
#else #else
operator std::basic_string<value_type> ()const operator std::basic_string<value_type> ()const
@ -66,19 +66,22 @@ struct sub_match : public std::pair<BidiIterator, BidiIterator>
#endif #endif
difference_type BOOST_REGEX_CALL length()const difference_type BOOST_REGEX_CALL length()const
{ {
difference_type n = ::boost::re_detail::distance((BidiIterator)this->first, (BidiIterator)this->second); difference_type n = matched ? ::boost::re_detail::distance((BidiIterator)this->first, (BidiIterator)this->second) : 0;
return n; return n;
} }
std::basic_string<value_type> str()const std::basic_string<value_type> str()const
{ {
std::basic_string<value_type> result; std::basic_string<value_type> result;
std::size_t len = ::boost::re_detail::distance((BidiIterator)this->first, (BidiIterator)this->second); if(matched)
result.reserve(len);
BidiIterator i = this->first;
while(i != this->second)
{ {
result.append(1, *i); std::size_t len = ::boost::re_detail::distance((BidiIterator)this->first, (BidiIterator)this->second);
++i; result.reserve(len);
BidiIterator i = this->first;
while(i != this->second)
{
result.append(1, *i);
++i;
}
} }
return result; return result;
} }