Re: [Boost-users] [bind] How to dereference _1 in a boost::bind expression

2 Oct 2008

      On Thu, Oct 2, 2008 at 11:45 AM, Sven Gaerner  wrote:
...
On Thu, 2 Oct 2008 11:12:54 +0100
"Peter Barker"  wrote:
...
Hello,
Here's an example of my problem:
#include <algorithm>
#include <vector>
#include 
class TheClass
{
};
void accept(TheClass& tc)
{
}
int main()
{
      std::vector cont;
// Compile error - how to dereference _1 ???
      std::for_each(cont.begin(),cont.end(),boost::bind(&accept,_1));
}
How can I dereference _1 so I can use the accept function?
Regards,
Pete
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You don't have to dereference _1. Your accept function must look like
this:
 void accept(TheClass *arg) {
 }
Your std::vector contains pointers to TheClass so std::for_each()
passes objects of that type to your functor, in this case a
pointer to types of TheClass.
Sven,

I was trying to avoid changing the signature of accept as it has other
call sites and I would need to update them. It's what I did in the end
though. Thanks,

Pete