type_traits proposal

From: David Abrahams (david.abrahams_at_[hidden])
Date: 2002-01-11 14:04:00

Here's another one we need:

  has_common_base_class<T,U>::value

This is the one which allows us to explicitly construct empty classes on top
of one another. I suppose you could argue that the compiler should just do
this automatically with the empty base optimization, but the ABIs of many
compilers are now fixed and they will never (for practical purposes) be able
to do it.

-Dave

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  David Abrahams, C++ library designer for hire
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          email: david.abrahams_at_[hidden]
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