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Section: 28.3.3.1 [locale] Status: TC1 Submitter: Angelika Langer Opened: 1999-03-17 Last modified: 2016-01-28
Priority: Not Prioritized
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Discussion:
Section 28.3.3.1 [locale] says:
-4- In the call to use_facet<Facet>(loc), the type argument chooses a facet, making available all members of the named type. If Facet is not present in a locale (or, failing that, in the global locale), it throws the standard exception bad_cast. A C++ program can check if a locale implements a particular facet with the template function has_facet<Facet>().
This contradicts the specification given in section
28.3.3.2 [locale.global.templates]:
template <class Facet> const Facet& use_facet(const
locale& loc);
-1- Get a reference to a facet of a locale.
-2- Returns: a reference to the corresponding facet of loc, if present.
-3- Throws: bad_cast if has_facet<Facet>(loc) is false.
-4- Notes: The reference returned remains valid at least as long as any copy of loc exists
Proposed resolution:
Remove the phrase "(or, failing that, in the global locale)" from section 22.1.1.
Rationale:
Needed for consistency with the way locales are handled elsewhere in the standard.