CODEWITHSUNDEEP
tcl
Alan Saldanha
Alan Saldanha

Reputation: 87

How to add a huge list of elements in a tcl list?

I have used some tcl code in a design tool to get the list of standard cells in a single list. Tcl has a limitation of processing a large number of elements to read from any list. How do I split these list of standard cells in a single data structure for the tool to read?

Upvotes: 0

Views: 360

Answers (1)

Donal Fellows
Donal Fellows

Reputation: 137567

If you've got a big list that you've got to split into small chunks for processing and don't want to just do all the pieces one by one with foreach, you can do this:

set big_list {lots and lots and lots...}

set index 0
set stride 10
while true {
    set chunk [lrange $big_list $index [expr {$index + $stride - 1}]]
    # Nothing left; got to the end
    if {![llength $chunk]} break
    incr index $stride

    process_chunk $chunk
}

Tune the stride size for how much you can feed through. (Theoretically, you can do auto-tuning of the stride length if there's some complex limit involved. Practically, just pick something by hand that works and isn't too inefficient; auto-tuning algorithms are always quite a lot more complicated.)

Upvotes: 1

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