Re: [Boost-users] using boost::mem_fn result as a parameter?

4 Sep 2003

      On Thursday 04 September 2003 06:26 pm, Mark Sizer wrote:
...
I'm new to boost::bind and boost::mem_fn. I've read the documentation
and I think I understand what they do, but I'm not sure how to use them
to accomplish my task.
I have a class that contains several vectors in a map. I want to put a
"foreach" method on the class that will callback an arbitrary member
function, of an arbitrary class, for each item in the vector.
I'm stuck on the signature of that method.
[snip]
...
void VectorHolder::foreach( std::string& rsName,
                             WHAT? callback )
{
   std::vector<VectorContent>& rvect = rvectGet( rsName );
   std::for_each( rvect.begin(), rvect.end(), callback );
}
You can write it the signature like this:

  void VectorHolder::foreach( std::string& rsName,
           const boost::function<void (VectorContent&)>& callback)

Or, if you need compatibility with broken compilers,

  void VectorHolder::foreach( std::string& rsName,
           const boost::function1<void, VectorContent&>& callback)

Both caller options (e.g., passing a member function pointer directly and 
using boost::mem_fn) will work with this formulation, as will any function 
object.

	Doug

Re: [Boost-users] using boost::mem_fn result as a parameter?

Douglas Gregor