Greetings!
In the train schedule program that you are all probably heartily sick
of by now, I have added a ScheduleDay class that represents all trains
running on a given day. It has a method that returns an array of
references to all of the Train objects for that day. I want to sort
those trains on the times people have to show up for them. The Train
class has a GetCrewCall() method that returns a string containing the
crew call time in HH:MM form, with two digits guaranteed for the hours.
Thus, "cmp" will suffice for the comparison. But I'm not sure how to
set up the sort. Here's what I have:
sub GetTrainsByTime
{
my $self = shift;
my @result;
my @temp;
my $aTrain;
my $aTrainName;
# First we build a temporary array of references to trains
foreach $aTrainName (keys $self)
{
push @temp, $self{aTrainName};
}
@result = sort {$a->GetCrewCall() cmp $b->GetCrewCall()} @temp;
return @result;
}
I'm pretty sure this will work, since $a and $b will be references to
Train objects, and whatever is inside the brackets is just a plain
ordinary block of code. Is this correct?
In general, $a and $b are going to be elements of the array being
sorted, aren't they?
Thanks!
Rob, came up with this just before bed and hasn't had time to try it
yet.
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