include <config.scad>;

function circle_details(r) = max(CURVE_POLYGON_MINIMUM,round(3.1415*r*2/CURVE_POLYGON_LENGTH));

function select(sel,vec) = [ for (i=sel) vec[i]];

function default(val,comp) = val != undef ? val : comp;


module construct() {
    module construct_get(name) {
        $construct_get=name;
        children();
    }
    difference() {
        construct_get("add") children();
        construct_get("remove") children();
    }

}

module add() {
    //check_parent("construct_get", "add", "could be used only as child of construct()");
    if($construct_get=="add")
        children();
}

module remove() {
    echo("remove",parent_module(1));

    if($construct_get=="remove")
        children();
}