This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of C++14 status.
Section: 32.11 [re.iter] Status: C++14 Submitter: Stephan T. Lavavej Opened: 2013-09-21 Last modified: 2016-01-28
Priority: 2
View all other issues in [re.iter].
View all issues with C++14 status.
Discussion:
Users can write "for(sregex_iterator i(s.begin(), s.end(), regex("meow")), end; i != end; ++i)", binding a temporary regex to const regex& and storing a pointer to it. This will compile silently, triggering undefined behavior at runtime. We now have the technology to prevent this from compiling, like how reference_wrapper refuses to bind to temporaries.
[2014-02-14 Issaquah meeting: Move to Immediate]
Proposed resolution:
This wording is relative to N3691.
Change 32.11.1 [re.regiter]/1, class template regex_iterator synopsis, as indicated:
regex_iterator(); regex_iterator(BidirectionalIterator a, BidirectionalIterator b, const regex_type& re, regex_constants::match_flag_type m = regex_constants::match_default); regex_iterator(BidirectionalIterator a, BidirectionalIterator b, const regex_type&& re, regex_constants::match_flag_type m = regex_constants::match_default) = delete;
Change 32.11.2 [re.tokiter]/6, class template regex_token_iterator synopsis, as indicated:
regex_token_iterator(); regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b, const regex_type& re, int submatch = 0, regex_constants::match_flag_type m = regex_constants::match_default); regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b, const regex_type& re, const std::vector<int>& submatches, regex_constants::match_flag_type m = regex_constants::match_default); regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b, const regex_type& re, initializer_list<int> submatches, regex_constants::match_flag_type m = regex_constants::match_default); template <std::size_t N> regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b, const regex_type& re, const int (&submatches)[N], regex_constants::match_flag_type m = regex_constants::match_default); regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b, const regex_type&& re, int submatch = 0, regex_constants::match_flag_type m = regex_constants::match_default) = delete; regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b, const regex_type&& re, const std::vector<int>& submatches, regex_constants::match_flag_type m = regex_constants::match_default) = delete; regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b, const regex_type&& re, initializer_list<int> submatches, regex_constants::match_flag_type m = regex_constants::match_default) = delete; template <std::size_t N> regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b, const regex_type&& re, const int (&submatches)[N], regex_constants::match_flag_type m = regex_constants::match_default) = delete;