method

remove_class_variable

v2_1_10 - Show latest stable - Class: Module

remove_class_variable(p1)

public

Removes the definition of the sym, returning that constant’s value.

class Dummy
  @@var = 99
  puts @@var
  remove_class_variable(:@@var)
  p(defined? @@var)
end

produces:

99
nil

VALUE
rb_mod_remove_cvar(VALUE mod, VALUE name)
{
    const ID id = rb_check_id(&name);
    st_data_t val, n = id;

    if (!id) {
	if (rb_is_class_name(name)) {
	    rb_name_error_str(name, "class variable %"PRIsVALUE" not defined for %"PRIsVALUE"",
			      name, rb_class_name(mod));
	}
	else {
	    rb_name_error_str(name, "wrong class variable name %"PRIsVALUE"", QUOTE(name));
	}
    }
    if (!rb_is_class_id(id)) {
	rb_name_error(id, "wrong class variable name %"PRIsVALUE"", QUOTE_ID(id));
    }
    rb_check_frozen(mod);
    if (RCLASS_IV_TBL(mod) && st_delete(RCLASS_IV_TBL(mod), &n, &val)) {
	return (VALUE)val;
    }
    if (rb_cvar_defined(mod, id)) {
	rb_name_error(id, "cannot remove %"PRIsVALUE" for %"PRIsVALUE"",
		 QUOTE_ID(id), rb_class_name(mod));
    }
    rb_name_error(id, "class variable %"PRIsVALUE" not defined for %"PRIsVALUE"",
		  QUOTE_ID(id), rb_class_name(mod));

    UNREACHABLE;
}

remove_class_variable

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