Maybe like this?  (You didn't say what is supposed to happen if there are more than a certain number of arguments, i.e. ignore, warn, die,... at runtime or compile-time...) 

#!/usr/bin/perl

sub foo {
    $#_ = 3 if @_ > 3;  # limit to 4 args
    print "$_\n" for @_;
    print "---\n";
}

foo(1,2,3);
foo(1,2,3,4);
foo(1,2,3,4,5);

__END__
1
2
3
---
1
2
3
4
---
1
2
3
4
---

[download]

(obviously, what I've shown implements the 'ignore' variant)

In reply to Re: Limit number of Sub routine argument list by almut
in thread Limit number of Sub routine argument list by ganeshwari

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