Multiple Distinct Objects

Rosetta example: Multiple distinct objects

Create a sequence (array, list, whatever) consisting of n distinct, initialized items of the same type. n should be determined at runtime.

package req nx

The class Klass defines and implements the item type. It can also be used to query its population of instances.

nx::Class create Klass
set n 100; # runtime parameter

Wrong: Only a single item (object) is created, its (command) name is replicated n times.

% llength [Klass info instances]
0;

set theList [lrepeat $n [Klass new]]

% llength [Klass info instances]
1;
% llength [lsort -unique $theList]
1;

[lindex $theList 0] destroy

Correct: n items (objects) having distinct (command) names are created and stored in the list.

% llength [Klass info instances]
0;

set theList {}

for {set i 0} {$i<$n} {incr i} {
    lappend theList [Klass new]
}

% llength [Klass info instances]
100;
% llength [lsort -unique $theList]
100;