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From: Peter Dimov (pdimov_at_[hidden])
Date: 2006-08-28 08:22:55

Phillip Hellewell wrote:
> On 8/18/06, Phillip Hellewell <sshock_at_[hidden]> wrote:
>> to this:
>> template<class Y>
>> shared_ptr(shared_ptr<Y> const & r, typename enable_if<typename
>> is_convertible<Y*, T*>::type, void*>::type = 0): px(r.px), pn(
>> // never throws
>> {
>> }
> I forgot to mention, you have to include these two headers in
> shared_ptr.hpp.
> #include <boost/type_traits.hpp>
> #include <boost/utility/enable_if.hpp>

Yes, and this is why the change isn't the no-brainer it seems at first.
shared_ptr is a critical Boost component that has to work on every compiler
supported by Boost (and a few unsupported ones.) So I tend to avoid
problematic constructs and unnecessary dependencies.

I agree that the feature is useful and will try to find a relatively
painless way to incorporate it.

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