[boost] Re: [typeof][result_of] Separated at Birth?

From: David Abrahams (dave_at_[hidden])
Date: 2005-06-09 13:43:03

Doug Gregor <dgregor_at_[hidden]> writes:

> On Jun 9, 2005, at 12:53 PM, Arkadiy Vertleyb wrote:
>
>> "David Abrahams" <dave_at_[hidden]> wrote
>>
>>>   template <class F, class A>
>>>   struct result_of<F(A)>
>>>   {
>>>       typedef typename BOOST_TYPEOF(make<F>() ( make<A>() ) ) type;
>>>   };
>>
>> BTW, I was having (not typeof-related) problems trying to achieve
>> this kind
>> of syntax in VC7.1 :-(
>>
>> http://lists.boost.org/boost/2005/06/27892.php
>>
>> "make<F>()(make<A>())" just doesn't work.  The only thing that kind
>> of works
>> (but with a warning) is "F()(make<A>())".
>>
>> Am I missing something?
>
> Should that be "make<F&>"? 

Probably make<typename add_reference<F>::type>() Note "something like" above.

> For workarounds, we could also declare a static member of type F.

Yeah.  Or maybe add more parens

       ( make<typename add_reference<F>::type>() )( make<A>() )

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