Re: [boost] boost::bind result type

Subject: Re: [boost] boost::bind result type
From: Daniel Walker (daniel.j.walker_at_[hidden])
Date: 2010-07-22 21:53:03

On Tue, Jul 20, 2010 at 8:16 PM, Steven Watanabe <watanabesj_at_[hidden]> wrote:
> AMDG
>
> Daniel Walker wrote:
>>
>> Actually, I just looked into it, and this wasn't as hard as I thought.
>> So, I can be a little more specific about the needed changes. As a
>> proof of concept, I have attached a patch that allows the following
>> where the bind object is stored directly by boost::function without
>> type erasure.
>>
>> #include <functional>
>> #include <boost/function.hpp>
>> #include <boost/bind.hpp>
>>
>> int main()
>> {
>>    using namespace boost;
>>    function<
>>         bind_signature(std::plus<int>,boost::arg<1>,int)
>>    > f = bind(std::plus<int>(), _1, 1);
>> }
>>
>
> If you're going to specify all the parameters of the
> bind expression in the type of the boost::function, you'd
> be better off just having a metafunction for deducing the
> return type of bind.

Yep, that would work too. I'm just trying to show that boost::function
could be extended to store bind objects without the type erasure
overhead.

Daniel Walker