Re: [Boost-users] [MPL/Fusion?]Call a 0-args template function on members of a sequence

From: David Abrahams (dave_at_[hidden])
Date: 2006-08-21 07:48:44

David Abrahams <dave_at_[hidden]> writes:

> Edd Dawson <edd_at_[hidden]> writes:
>
>> Hello all,
>>
>> I have the following:
>>
>>      template<typename T>
>>      void f() { /* ... */ }
>>
>>      typedef boost::mpl::vector<int, long, double> my_vec;
>>
>> I'm looking for a way to call f<T>() for all types T in my_vec. I initially 
>> hoped that either an mpl algorithm or fusion::for_each might be able to 
>> accomplish this for me, but after reading through their docs this doesn't appear 
>> to be the case.
>
>   struct call_f
>   {
>      template <class Wrapper>
>      void operator()(Wrapper)
Sorry, it's missing a "const" right here--^^^^
>      {
>          f<typename Wrapper::type>();
>      }
>   };
>
>   mpl::for_each<my_vec, mpl::identity<_> >(call_f());

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