End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Module#private_class_method

mod.private_class_method(symbol, ...) → mod

mod.private_class_method(string, ...) → mod

mod.private_class_method(array) → mod

static VALUE
rb_mod_private_method(int argc, VALUE *argv, VALUE obj)
{
    set_method_visibility(rb_singleton_class(obj), argc, argv, METHOD_VISI_PRIVATE);
    return obj;
}

Makes existing class methods private. Often used to hide the default constructor new.

String arguments are converted to symbols. An Array of Symbols and/or Strings are also accepted.

Example

class SimpleSingleton  # Not thread safe
  private_class_method :new
  def SimpleSingleton.create(*args, &block)
    @me = new(*args, &block) if ! @me
    @me
  end
end

Ruby version changes

3.0
- Module#public, Module#protected, Module#private, Module#public_class_method, Module#private_class_method, toplevel “private” and “public” methods now accept single array argument with a list of method names. [Feature #17314]

See also #private #private_constant #prepend_features #private_instance_methods also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1

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