class T::Private::Types::SimplePairUnion

This covers e.g. T.nilable(SomeModule), T.any(Integer, Float), and T::Boolean.
Specialization of Union for the common case of the union of two simple types.

def initialize(type_a, type_b)

Parameters:
  • type_b (T::Types::Simple) --
  • type_a (T::Types::Simple) -- 
def initialize(type_a, type_b)
  if type_a == type_b
    raise DuplicateType.new("#{type_a} == #{type_b}")
  end
  @raw_a = type_a.raw_type
  @raw_b = type_b.raw_type
end

def recursively_valid?(obj)

@override Union 
def recursively_valid?(obj)
  obj.is_a?(@raw_a) || obj.is_a?(@raw_b)
end

def types

@override Union 
def types
  # We reconstruct the simple types rather than just storing them because
  # (1) this is normally not a hot path and (2) we want to keep the instance
  # variable count <= 3 so that we can fit in a 40 byte heap entry along
  # with object headers.
  @types ||= [
    T::Types::Simple::Private::Pool.type_for_module(@raw_a),
    T::Types::Simple::Private::Pool.type_for_module(@raw_b),
  ]
end

def unwrap_nilable

overrides Union 
def unwrap_nilable
  a_nil = @raw_a.equal?(NilClass)
  b_nil = @raw_b.equal?(NilClass)
  if a_nil
    return types[1]
  end
  if b_nil
    return types[0]
  end
  nil
end

def valid?(obj)

@override Union 
def valid?(obj)
  obj.is_a?(@raw_a) || obj.is_a?(@raw_b)
end