method

<=

v2_1_10 - Show latest stable - 1 note - Class: Module

<=(p1) public

Returns true if mod is a subclass of other or is the same as other. Returns nil if there’s no relationship between the two. (Think of the relationship in terms of the class definition: “class A<B” implies “A<B”.)

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VALUE
rb_class_inherited_p(VALUE mod, VALUE arg)
{
    VALUE start = mod;

    if (mod == arg) return Qtrue;
    if (!CLASS_OR_MODULE_P(arg) && !RB_TYPE_P(arg, T_ICLASS)) {
        rb_raise(rb_eTypeError, "compared with non class/module");
    }
    arg = RCLASS_ORIGIN(arg);
    if (class_search_ancestor(mod, arg)) {
        return Qtrue;
    }
    /* not mod < arg; check if mod > arg */
    if (class_search_ancestor(arg, start)) {
        return Qfalse;
    }
    return Qnil;
}

January 11, 2010

0 thanks

Includes descendants

May be helpful to know that this returns true if A is any descendant of B, not just a direct one. As an example:

class Foo; end
class Bar < Foo; end
class Baz < Bar; end

Bar <= Foo #=> true
Baz <= Foo #=> true

<=

Related methods

Includes descendants