On Thursday 28 June 2007 05:14, Erik Johansson wrote:
> Without using boost, it can sometimes be cumbersome to create the
> functors that you need, instead of using a simple loop. But
> boost::lambda looks like it might be the answer to all my prayers, so
> I'm willing to give it a try.
Have you taken a look at boost::bind? It really makes things simple. I haven't
found an example like this, but it works nicely:
// inside a long function
for (iter = users.begin().....)
{
(*iter)->calcFunction();
if ((*iter)->verifyFunction)
{
delete (*iter);
users.erase(iter);
break;
}
(*iter)->doMoreWork();
}
And then you can add a new function to the class..
void theClass::doWork(ICQUser *&user) // <-- pointer reference is necessary
here
{
user->calcFunction()
if (user->verifyFunction())
{
delete user;
user = 0;
return;
}
user->doMoreWork();
}
Then in the original code...
// Do the task with the idea of a function having one main purpose
std::for_each(users.begin(), users.end(), boost::bind(&theClass::doWork, this,
_1));
// Remove any deleted iterators
users.erase(std::remove(users.begin(), users.end(), static_cast<ICQUser
*>(0)), users.end());
There is also the BOOST_FOREACH, but it doesn't promote modular code. In fact
it does the opposite, so I'm not really that interested in using it.
Jon
--
________________________________________________________
Jon Keating ICQ: 16325723
[EMAIL PROTECTED] MSN: [EMAIL PROTECTED]
http://www.licq.org GPG: 2290A71F
http://www.thejon.org HOME: Minamiashigara, Japan
