Re: [Boost-users] [bind] How to dereference _1 in a boost::bindexpression

Subject: Re: [Boost-users] [bind] How to dereference _1 in a boost::bindexpression
From: Peter Barker (newbarker_at_[hidden])
Date: 2008-10-02 11:05:12

On Thu, Oct 2, 2008 at 3:25 PM, Peter Dimov <pdimov_at_[hidden]> wrote:
> Peter Barker:
> ...
>>
>> void accept(TheClass& tc)
>> {
>> }
>>
>> int main()
>> {
>> std::vector<TheClass*> cont;
>>
>> // Compile error - how to dereference _1 ???
>> std::for_each(cont.begin(),cont.end(),boost::bind(&accept,_1));
>> }
>>
>> How can I dereference _1 so I can use the accept function?
>
> With boost::bind, there's no easy way to dereference _1. You'd need
>
> template<class T> T& deref( T* p ) { return *p; }
>
> std::for_each( cont.begin(), cont.end(),
>   boost::bind( accept, boost::bind( deref<TheClass>, _1 ) )
> );
Peter,

It's nice to hear the answer from the horses mouth (so to speak)!

Regards,

Pete