[boost] Re: implicit_cast documentation

From: David Abrahams (dave_at_[hidden])
Date: 2003-11-26 11:13:51

garcia <garcia_at_[hidden]> writes:

> Is implicit_cast documented somewhere?  

Sorry, I think I checked it in without having time to come up with
the docs... yet.

> I thought I would find it discussed in the conversion library docs,
> but to my dismay it was not

The quick summary is: implicit_cast<T>(expression) is equivalent to
T(expression) iff the type of expression is implicitly convertible to
T and T is copy-constructible.  Otherwise it is ill-formed.

I want to get around the copy-constructible requirement, but at the
moment I don't see how: you can't even bind a non-const reference to
a non-copy-constructible rvalue.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com