Re: [Boost-users] lambda::bind and abstract class - how to?

Subject: Re: [Boost-users] lambda::bind and abstract class - how to?
From: Robert Jones (robertgbjones_at_[hidden])
Date: 2010-03-05 09:37:56

On Fri, Mar 5, 2010 at 1:33 PM, Archie14 <admin_at_[hidden]> wrote:

> Here is the sample that fails to compile. Complain is about foo being
> abstract
> in IA. Any advise of how to make it work will be greatly appreciated.
>
> #include <boost/lambda/lambda.hpp>
> #include <boost/lambda/bind.hpp>
> #include <boost/ptr_container/ptr_vector.hpp>
>
> class IA
> {
> public:
>        virtual int foo() const = 0;
> };
>
> class B : public IA
> {
> public:
>        B (int a) : _a(a) {};
>        int foo() const {return _a;}
> private:
>        int _a;
> };
>
>
> int _tmain(int argc, _TCHAR* argv[])
> {
>        boost::ptr_vector<IA> lst;
>        lst.push_back(new B(1));
>        lst.push_back(new B(2));
>
>        boost::ptr_vector<IA>::iterator it =
>                std::find_if (lst.begin(),
>                                lst.end(),
>                                boost::lambda::bind(&IA::foo,
> boost::lambda::_1) == 1);
>        return 0;
> }
>
>
Replacing boost::lambda::_1 with &boost::lambda::_1 makes my compiler (gcc
4.1.1) stop
complaining. Is that what you need?

- Rob.