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From: David Abrahams (dave_at_[hidden])
Date: 2008-07-02 19:33:40

Giovanni Piero Deretta wrote:
> On Thu, Jul 3, 2008 at 12:06 AM, David Abrahams <dave_at_[hidden]> wrote:
>> Giovanni Piero Deretta wrote:
>>> On Wed, Jul 2, 2008 at 8:40 PM, Eric Niebler <eric_at_[hidden]> wrote:
>>>> I don't know a sufficiently portable way to ask a type whether it has
>>>> implemented the result_of protocol. In C++0x, result_of will simply use
>>>> decltype, so at the very least Phoenix's approach is forward-compatible.
>>> With 'portable' you mean 'works with non completely compliant compilers'?
>>> Otherwise I think you can legally sfinae on the presence of both
>>> result<> and result_type.
>> Demonstration, please. I don't know of a way to detect a nested
>> template with SFINAE.
> Daniel Walker posted a patch sometime ago to add
> BOOST_HAS_TEMPLATE_XXX to mpl. Here is a link:

No patch attached. This probably came over from the sourceforge
tracker, but that appears to be gone now so I can't even look there for
the attachment.

Dave Abrahams
BoostPro Computing

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