Re: [Boost-users] [LAMBDA] calling a function pointer stored in a struct

7 Apr 2006


      On 4/7/06, Imre  wrote:
...
Hi
I'm new to the boost::lambda lib, and have a problem.
I have a list that stores struct objects. One field of the struct is a
function pointer. I'd like to call the function pointer stored in each
element of the list, but I can't get it right.
First, I tried something like this:
struct S
{
        typedef void (*Func)();
        Func f;
        ...
};
...
std::list<S> l;
...
for_each(l.begin(), l.end(), bind(&S::f, _1));
I think this doesn't work because the bind yields a function object that
returns f itself, but doesn't call it. Instead, I'd need to build a
function object that returns the result of calling the f stored in the
current list node. Unfortunately, I don't know how to do it.
Thanks for any help.
Imre
Try this:

   for_each(l.begin(), l.end(), bind(bind(&S::f, _1)));

Tested & works under gcc 4.0.1, OS X 10.4

Stuart Dootson