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regex_traits::lookup_classname
specification unclearSection: 32.6 [re.traits] Status: C++14 Submitter: Jonathan Wakely Opened: 2013-07-02 Last modified: 2016-01-28
Priority: Not Prioritized
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Discussion:
32.6 [re.traits] p9 says that regex_traits::lookup_classname
should
return a value that compares equal to 0, but there is no requirement
that a bitmask type is equality comparable with 0, e.g. 16.3.3.3.3 [bitmask.types] says bitmask types
can be implemented using std::bitset
.
[2013-09 Chicago]
Stefanus: Resolution looks good, doesn't seem to need fixing anywhere else from a quick look through the draft.
Any objection to Ready? No objection. Action: Move to Ready.Proposed resolution:
This wording is relative to N3691.
Edit 32.6 [re.traits] p9:
template <class ForwardIterator> char_class_type lookup_classname( ForwardIterator first, ForwardIterator last, bool icase = false) const;-9- Returns: an unspecified value that represents the character classification named by the character sequence designated by the iterator range
[first,last)
. If the parametericase
is true then the returned mask identifies the character classification without regard to the case of the characters being matched, otherwise it does honor the case of the characters being matched. The value returned shall be independent of the case of the characters in the character sequence. If the name is not recognized then returnsa value that compares equal to 0char_class_type()
.