Re: [boost] [type_traits] Is it possible to test for an explicit conversion?

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.

(See 
https://svn.boost.org/svn/boost/sandbox/conversion/libs/conversion_ext/doc/html/boost/conversion/reference.html#boost.conversion.reference.type_traits_extensions
and

https://svn.boost.org/svn/boost/sandbox/conversion/boost/conversion/type_traits/
).

HTH,
Vicente

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