Re: [Boost-users] [phoenix] - std::for_each - How to call member variable that is a boost::function?

Subject: Re: [Boost-users] [phoenix] - std::for_each - How to call member variable that is a boost::function?
From: Aaron_Wright_at_[hidden]
Date: 2013-04-30 17:07:30

Yes it does compile, but it doesn't do anything. I'm looking for it to 
print out the numbers. I need the callback to be called.

---
Aaron Wright
From:   Igor R <boost.lists_at_[hidden]>
To:     boost-users_at_[hidden]
Date:   04/30/2013 10:04 AM
Subject:        Re: [Boost-users] [phoenix] - std::for_each - How to call 
member variable that is a boost::function?
Sent by:        "Boost-users" <boost-users-bounces_at_[hidden]>
> namespace bp = boost::phoenix;
> namespace bpa = bp::arg_names;
>
> struct Foo
> {
>    boost::function< void() > callback;
>
>    Foo(boost::function< void() > const& callback) :
>       callback(callback)
>    {
>    }
> };
>
> main()
> {
>    std::list< Foo > foos;
>
>    foos.push_back(Foo(std::cout << bp::val(1) << '\n'));
>    foos.push_back(Foo(std::cout << bp::val(2) << '\n'));
>    foos.push_back(Foo(std::cout << bp::val(3) << '\n'));
>
>    std::for_each(
>       foos.begin(),
>       foos.end(),
>      bp::bind(&Foo::callback, bpa::arg1));
> }
>
> If I wrap the bind(...) in another bind(...) it'll work, but is that the
> right way? I'm not binding anything, I just want the callback called.
FWIW, the following code compiles in MSVC10 with boost 1.53
(basically, your code in form of sscce):
#include <boost/phoenix.hpp>
#include <iostream>
#include <boost/function.hpp>
#include <list>
namespace bp = boost::phoenix;
 namespace bpa = bp::arg_names;
struct Foo
 {
    boost::function< void() > callback;
   Foo(boost::function< void() > const& callback) :
       callback(callback)
    {
    }
 };
int main()
{
    std::list< Foo > foos;
   foos.push_back(Foo(std::cout << bp::val(1) << '\n'));
    foos.push_back(Foo(std::cout << bp::val(2) << '\n'));
    foos.push_back(Foo(std::cout << bp::val(3) << '\n'));
   std::for_each(
       foos.begin(),
       foos.end(),
      bp::bind(&Foo::callback, bpa::arg1));
}
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