method

throw

v1_9_1_378 - Show latest stable - 1 note - Class: Kernel

throw(p1, p2 = v2) public

Transfers control to the end of the active catch block waiting for tag. Raises ArgumentError if there is no catch block for the tag. The optional second parameter supplies a return value for the catch block, which otherwise defaults to nil. For examples, see Kernel::catch.

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static VALUE
rb_f_throw(int argc, VALUE *argv)
{
    VALUE tag, value;
    rb_thread_t *th = GET_THREAD();
    struct rb_vm_tag *tt = th->tag;

    rb_scan_args(argc, argv, "11", &tag, &value);
    while (tt) {
        if (tt->tag == tag) {
            tt->retval = value;
            break;
        }
        tt = tt->prev;
    }
    if (!tt) {
        VALUE desc = rb_inspect(tag);
        rb_raise(rb_eArgError, "uncaught throw %s", RSTRING_PTR(desc));
    }
    rb_trap_restore_mask();
    th->errinfo = NEW_THROW_OBJECT(tag, 0, TAG_THROW);

    JUMP_TAG(TAG_THROW);
#ifndef __GNUC__
    return Qnil;                /* not reached */
#endif
}

April 21, 2009

3 thanks

To throw an exception, use Kernel#raise

Other languages use the term throw for raising exceptions, but Ruby has a specific raise call for that.

throw

Related methods

To throw an exception, use Kernel#raise