Re: [Boost-users] [Proto] callable_context

Subject: Re: [Boost-users] [Proto] callable_context
From: Eric Niebler (eric_at_[hidden])
Date: 2011-01-04 10:02:42

On 1/4/2011 8:10 AM, Hossein Haeri wrote:
> Hi Erik,
> 
>>   struct add_one_ {
>>     typedef int result_type;
>>     int operator()(int i) const {
>>       return i + 1;
>>     }
>>   };
>>
>>   proto::terminal<add_one_>::type const add_one
>> = {};
> 
> This needs me to wrap every function into a function object and then instantiate that function object using an aggregate syntax. This is awkward. I need something automatic for functions.
> 
>> 1 >> add_one >> add_one
> 
> I need something which can work with expressions like
> 
> 1 >> &f >> &g >> &h
> 
> where f, g, and h are ordinary functions. Is that also doable in Proto?

No. It's not doable in C++, period. There are no UDTs in the above
expression, so no operator overloads are considered. And there are no
built-in operators that make that well-formed.

-- 
Eric Niebler
BoostPro Computing
http://www.boostpro.com