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Subject: Re: [boost] [type_traits] Is it possible to test for an explicit conversion?
From: Vicente Botet (vicente.botet_at_[hidden])
Date: 2012-07-20 10:22:32
John Maddock-3 wrote
>
> OK, so we don't have such a trait at present, but one of the requests from
> the multiprecision review was "make conversions explicit in the front end
> if
> they are in the backend". Which to do it nicely (and semi-automagically)
> requires a trait that tests whether A is explicitly convertible to B.
> Which
> would obviously make a useful type trait in it's own right, but....
> anyone
> have any ideas on how such a trait could be implemented? At present it
> looks "impossible" to me, but I've learned never to say never ;-)
>
> Thanks, John.
>
>
Hi,
I don't know on which state there are the traits I introduced in the
rejected Boost.Conversion:
is_assignable.hpp
is_constructible.hpp
is_convertible.hpp
is_copy_assignable.hpp
is_copy_constructible.hpp
is_default_constructible.hpp
is_destructible.hpp
is_explicitly_convertible.hpp
is_move_assignable.hpp
is_move_constructible.hpp
Of course, there should be some limitation with older compilers.
https://svn.boost.org/svn/boost/sandbox/conversion/boost/conversion/type_traits/
).
HTH,
Vicente
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