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use 5.008005;
use strict;
use warnings;

our $VERSION = "0.01";

use parent qw(Exporter);

our @EXPORT = qw(op_grep op_walk op_descendants);

sub op_walk(&$) {
    my ($code, $op) = @_;
    local *B::OP::walkoptree_simple = sub {
        local $_ = $_[0];
        $code->();
    };
    B::walkoptree($op, 'walkoptree_simple');
}

sub op_grep(&$) {
    my ($code, $op) = @_;

    my @ret;
    op_walk {
        if ($code->()) {
            push @ret, $_;
        }
    } $op;
    return @ret;
}