Question

So here’s a snippet of my code.

void RoutingProtocolImpl::removeAllInfinity()
{
  dv.erase(std::remove_if(dv.begin(), dv.end(), hasInfCost), dv.end()); 
}

bool RoutingProtocolImpl::hasInfCost(RoutingProtocolImpl::dv_entry *entry)
{
  if (entry->link_cost == INFINITY_COST)
  {
    free(entry);
    return true;
  }
  else
  {
    return false;
  }
}

I’m getting the following error when compiling:

RoutingProtocolImpl.cc:368: error: argument of type bool (RoutingProtocolImpl::)(RoutingProtocolImpl::dv_entry*)' does not matchbool (RoutingProtocolImpl::)(RoutingProtocolImpl::dv_entry)'

Answer 1

The problem is that this: bool RoutingProtocolImpl::hasInfCost(...) is a nonstatic member function.

It requires an instance of the class to invoke on, ala: obj->hasInfCost(...). However, remove_if cares not and tries to call it as hasInfCost(...). These are incompatible.

What you can do is make it static:

static bool RoutingProtocolImpl::hasInfCost(RoutingProtocolImpl::dv_entry *entry) This no longer requires an instance of the class to invoke. (It has no member variables, no this pointer, etc.). It can be treated as a “normal” function.