Method: Module#define_method

Defined in:

proc.c

#define_method(symbol, method) ⇒ Object #define_method(symbol) { ... } ⇒ Object

Defines an instance method in the receiver. The method parameter can be a Proc, a Method or an UnboundMethod object. If a block is specified, it is used as the method body. If a block or the method parameter has parameters, they’re used as method parameters. This block is evaluated using #instance_eval.

class A
  def fred
    puts "In Fred"
  end
  def create_method(name, &block)
    self.class.define_method(name, &block)
  end
  define_method(:wilma) { puts "Charge it!" }
  define_method(:flint) {|name| puts "I'm #{name}!"}
end
class B < A
  define_method(:barney, instance_method(:fred))
end
a = B.new
a.barney
a.wilma
a.flint('Dino')
a.create_method(:betty) { p self }
a.betty

produces:

In Fred
Charge it!
I'm Dino!
#<B:0x401b39e8>

Overloads:

• #define_method(symbol) { ... } ⇒ Object

  Yields:

# File 'proc.c', line 2350

static VALUE
rb_mod_define_method(int argc, VALUE *argv, VALUE mod)
{
    const rb_cref_t *cref = rb_vm_cref_in_context(mod, mod);
    const rb_scope_visibility_t default_scope_visi = {METHOD_VISI_PUBLIC, FALSE};
    const rb_scope_visibility_t *scope_visi = &default_scope_visi;

    if (cref) {
        scope_visi = CREF_SCOPE_VISI(cref);
    }

    return rb_mod_define_method_with_visibility(argc, argv, mod, scope_visi);
}