Re: [boost] determine first arg of callable

Subject: Re: [boost] determine first arg of callable
From: Nathan Ridge (zeratul976_at_[hidden])
Date: 2013-05-16 03:22:48

>>> No, bind function object types do not have the argument types. These
>> types
>>> are not known until the function object is actually invoked. The only
>> types
>>> you will find is the bound function object type and bound argument values
>>> types (and the latter may differ from the actual argument types, BTW).
>>
>> This is an aside, but is there a way, given the result of a bind(), to
>> get the types of the bound argument values?
>>
>
> For boost::bind you can use visit_each [1] or decompose the bind_t template
> type manually. Both ways are not quite documented, but it is doable. For
> other bind implementations the code may differ but the same types should be
> present in some form in the function object type.
>
> [1] http://www.boost.org/doc/libs/release/libs/bind/bind_visitor.cpp

Interesting, thanks!

Do you know of a (standard) way to do it for std::bind?

Thanks,
Nate