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From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2004-09-05 06:55:38

David Abrahams writes:
> "Jonathan Turkanis" <technews_at_[hidden]> writes:
> > I liked BOOST_MPL_ASSERT_IS_SAME because I didn't have to use double
> > parantheses.
> But you were out of luck if one of the types contained commas.
> BOOST_MPL_ASSERT_IS_SAME(T, pair<int, long>) // error!
> and no amount of parenthesization could fix it.

Not to mention that when the assertion actually failed, you couldn't
see what *is* the T. Now you get a beautiful error along these lines:

C:\home\depot\stuff\asserts.cpp(8) : error C2664: 'boost::mpl::assertion_failed' :
cannot convert parameter 1 from
'boost::mpl::failed ************boost::is_same<T,U>::* *********** '
to 'boost::mpl::assert<false>::type'
        A reference that is not to 'const' cannot be bound to a non-lvalue

Aleksey Gurtovoy
MetaCommunications Engineering

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