[boost] Re: compressed_pair requirements?

From: John Maddock (john_at_[hidden])
Date: 2005-05-24 00:11:44

> Can arguments to compressed_pair be const-qualified?  The
> documentation only lists this restriction:
>
>  Note that compressed_pair can not be instantiated if either of the
>  template arguments is a union type, unless there is compiler support
>  for boost::is_union, or if boost::is_union is specialised for the
>  union type.
>
> I believe I am getting an error from Intel C++ when an argument to
> compressed_pair is const.  The question is whether we need a
> workaround in compressed_pair.hpp or a change to the html
> documentation.

OK, the following:

boost::compressed_pair<const int, long> cp2;

Gives me a compiler error with VC7.1 (it should as well, but it's not really 
a compressed_pair issue).

Where are this:

boost::compressed_pair<const int, long> cp2(0); compiles as expected.

As does

boost::compressed_pair<const myclass, long> cp2;

as long as myclass has a user-defined default constructor.

That's all exactly what I would expect, what am I missing?

John.