[boost] Re: result of compose discussion

From: Greg Colvin (greg_at_[hidden])
Date: 1999-06-22 14:07:03

From: Reid Sweatman <reids_at_[hidden]>
> > From: Greg Colvin [mailto:greg_at_[hidden]]
> ...
> > > but I think that leading underscores are discouraged by the 
> > C++ standard.
> > 
> > Not just discouraged, but reserved for the implementor and 
> > forbidden to the
> > user.
> 
> Unless the spec has changed since I last looked, the symbols reserved to
> implementation use were those that contained double underscores and those
> that began with an underscore followed by a capital letter.

17.4.3.1.2  Global names                            [lib.global.names]

1 Certain sets of names and function signatures are always  reserved  to
  the implementation:

  --Each  name  that  contains a double underscore __) or begins with an
    underscore followed by an uppercase letter (_lex.key_)  is  reserved
    to the implementation for any use.

  --Each  name  that begins with an underscore is reserved to the imple-
    mentation for use as a name in the global namespace.22)

  22)  Such  names  are  also  reserved  in  namespace  ::std  (_lib.re-
  served.names_).

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