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: Franz Alt (f.alt_at_[hidden])
Date: 2008-10-02 06:51:10

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