# ------------------------------
# Call in array context
# wantarray() will return true inside some_function
my @ary = some_function;

# And see how many items were returned.
my $num_items = scalar @ary;

# ------------------------------
# Call with explicit scalar context:
# wantarray() will return false inside some_function
my $num_items = scalar some_function;

# $num_items might or might not be the same as the array
# context call above, depending on whether some_function
# chooses to check want_array and do something different.

# ------------------------------
# Call with explicit scalar context:
# wantarray() will return false inside some_function
my $num_items = some_function;
# As above.