1337. Swapped arguments in regex_traits::isctype

Section: 31.7 [re.traits] Status: C++11 Submitter: Howard Hinnant Opened: 2010-06-21 Last modified: 2016-02-10

Priority: Not Prioritized

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Discussion:

31.7 [re.traits]/12 describes regex_traits::isctype in terms of ctype::is(c, m), where c is a charT and m is a ctype_base::mask. Unfortunately 25.4.1.1.1 [locale.ctype.members] specifies this function as ctype::is(m, c)

[ Post-Rapperswil: ]

Moved to Tentatively Ready after 5 positive votes on c++std-lib.

[ Adopted at 2010-11 Batavia ]

Proposed resolution:

Change 31.7 [re.traits] p.12:

bool isctype(charT c, char_class_type f) const;

11 ...

12 Returns: Converts f into a value m of type std::ctype_base::mask in an unspecified manner, and returns true if use_facet<ctype<charT> >(getloc()).is(cm, mc) is true. Otherwise returns true if f bitwise or'ed with the result of calling lookup_classname with an iterator pair that designates the character sequence "w" is not equal to 0 and c == '_', or if f bitwise or'ed with the result of calling lookup_classname with an iterator pair that designates the character sequence "blank" is not equal to 0 and c is one of an implementation-defined subset of the characters for which isspace(c, getloc()) returns true, otherwise returns false.