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Re: [v3] libstdc++/7811
> I don't know what the C++ says about extra locale categories,
> but the sensible thing to do is to include all the categories setlocale
> understands in the composite name even if C++ doesn't do anything with
> them. Otherwise, you could lose some settings going from a user's
> LANG environment variable -> C++ -> environment -> C setlocale.
> That case can be handled right by just preserving the user's setting.
> But if it's actually multiple LC_* vars -> C++ -> just LANG -> C,
> then you would want to make sure that the C++ code collecting environment
> variables collects all the ones that setlocale would.
The following categores are specified by C++:
static const category none = 0;
static const category ctype = 1L << 0;
static const category numeric = 1L << 1;
static const category collate = 1L << 2;
static const category time = 1L << 3;
static const category monetary = 1L << 4;
static const category messages = 1L << 5;
static const category all = (collate | ctype | monetary |
numeric | time | messages);
There are more for C/POSIX.