[C++-sig] V2: conversions through constructors?

[David Abrahams]

----- Original Message -----
From: "Peter Bienstman" <pbienst at MIT.EDU>


> Hi,
>
> I know V2 supports the implicitly_convertible() construct for the case
> of implicitly defined conversion operators, but is there something
> similar for the case of a constructor A(B), rather than a conversion
> operator B->A?
>
> Just wrapping the constructor doesn't seem to do the trick...

You use the same mechanism:

    implicitly_convertible<B,A>();

see libs/python/test/implicit.*. It shows implicit conversion from
int->X.

    >>> x_value(42)
    42

-Dave