http://llvm.org/bugs/show_bug.cgi?id=12321
Bug #: 12321
Summary: error_category has a private constructor.
Product: libc++
Version: unspecified
Platform: Macintosh
OS/Version: MacOS X
Status: NEW
Severity: enhancement
Priority: P
Component: All Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
The constructor in error_category in the <system_error> header has a private
constructor. This prevents users from creating their own error categories by
deriving from error_category.
Internally it looks like libc++ uses the class __do_message which is declared
as a friend of error_category to setup its own error categories.
Should we use __do_messages as library users to create our own error categories
(it is marked _LIBCPP_HIDDEN)?
or
The private constructor in error_category is a mistake.
Thanks,
Yasser
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