R: [Boost-users] [BLL] How to search in a list for an objectcomparinga data member?

From: Gianluca Silvestri (gianluca.silvestri_at_[hidden])
Date: 2003-10-31 09:03:23

> -----Messaggio originale-----
> Da: boost-users-bounces_at_[hidden] 
> [mailto:boost-users-bounces_at_[hidden]] Per conto di Darren Cook
> Inviato: venerd́ 31 ottobre 2003 14.31
> A: Boost Users mailing list
> Oggetto: Re: [Boost-users] [BLL] How to search in a list for 
> an objectcomparinga data member?
> 
> 
> >>struct Foo { int fDataMember;}
> >>
> >>int main()
> >>{
> >>    std::vector<Foo> foos;
> >>    Foo fo;
> >>    std::find_if(foos.begin(), foos.end(), _1->fDataMember == 
> >>fo.fDataMember); //<-- won't compile; }
> 
> As your vector is of Foo, not Foo*, did you mean "_1.fDataMember" ?
> 
> If so, you can do this:
>   std::find_if(foos.begin(), foos.end(),
>      bind(&Foo::fDataMember,_1) == fo.fDataMember);
> 
> That assumes:
>   #include <boost/lambda/lambda.hpp>
>   #include <boost/lambda/bind.hpp>
>   using namespace boost::lambda;
> 
> > I imagine you're having trouble with "_1->fDataMember".
> 
> I didn't realize there was a limitation when using "->". 
> Surely there must 
> already be something in the lambda library to deal with this? 
> It seems like 
> something that must come up a lot.
> 
> Darren

Thanks
Gianluca
> 
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