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use strict;
use warnings;
...
print("Before: @a\n");
grep_in_place { $_ > 4 } @a;
print("After:  @a\n");

Before: 1 2 3 4 5 6 7 8
After:  5 6 7 8

sub grep_and_remove(&\@) {
   my ($cb, $array) = @_;
...
my @b = grep_and_remove { $_ > 4 } @a;
print("After:    @a\n");
print("Returned: @b\n");

Before:   1 2 3 4 5 6 7 8
After:    1 2 3 4
Returned: 5 6 7 8