[boost] Re: mpl apply_if.hpp question

From: David Abrahams (dave_at_[hidden])
Date: 2004-09-13 15:06:31

"Jonathan Turkanis" <technews_at_[hidden]> writes:

> "Robert Ramey" <ramey_at_[hidden]> wrote in message
> news:20040913173738.24EAC3123A_at_acme.west.net...
>> Would someone have a fit if something like this were added to boost/mpl ?
>
>>
>> template<
>>       typename C
>>     , typename F1
>>     , typename F2
>>     >
>> struct apply_if
>> {
>>     typedef BOOST_DEDUCED_TYPENAME eval_if<C,F1,F2>::type type;
>> };
>
> How about
>
>      template<
>           typename C
>         , typename F1
>         , typename F2
>         >
>     struct apply_if : eval_if<C,F1,F2> { };

Metafunction forwarding confuses some old broken compilers.  Robert's
version is a bit more conservative.

But, really, how hard can a global search/replace be?  Or is Spirit
1.6.1 archived?

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com