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

Subject: Re: [Boost-users] [bind] How to dereference _1 in a boost::bind expression
From: Peter Barker (newbarker_at_[hidden])
Date: 2008-10-02 09:36:36

On Thu, Oct 2, 2008 at 11:51 AM, Franz Alt <f.alt_at_[hidden]> wrote:
> Robert Jones schrieb:
>>
>> On Thu, Oct 2, 2008 at 11:12 AM, Peter Barker <newbarker_at_[hidden]> wrote:
>>
>>>
>>> Hello,
>>>
>>> Here's an example of my problem:
>>>
>>> #include <algorithm>
>>> #include <vector>
>>>
>>> #include <boost/bind.hpp>
>>>
>>> class TheClass
>>> {
>>> };
>>>
>>> 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?
>>>
>>
>> #include <algorithm>
>> #include <vector>
>>
>> #include <boost/lambda/bind.hpp>
>> #include <boost/lambda/lambda.hpp>
>>
>> class TheClass
>> {
>> };
>>
>> void accept(TheClass& tc)
>> {
>> }
>>
>> int main()
>> {
>>       using namespace boost;
>>       using namespace boost::lambda;
>>
>>       std::vector<TheClass*> cont;
>>
>>       // Compile error - how to dereference _1 ???
>>       std::for_each(cont.begin(),cont.end(),bind(accept,*_1));
>> }
>>
>> - Rob.
>> _______________________________________________
>> Boost-users mailing list
>> Boost-users_at_[hidden]
>> http://lists.boost.org/mailman/listinfo.cgi/boost-users
>>
>
> Hi Rob,
>
> with
>
> std::for_each(cont.begin(),cont.end(),bind(&accept,*_1));
>
> you can dereference _1.
>
> Best regards
>
> Franz

Franz,

I think that gave an illegal indirection compiler error.

Regards,

Pete