class TypedReffable

TypedReffable is a subclass of Reffable that supports dynamic type-checking.

To make a new subclass of TypedReffable, you must follow some simple steps:

1) add a new entry to the enum of types in the hierarchy, creating a new enum

if this is the first type (see type_info.h for details).

2) in your new class, add a const static member to represent the type.

3) also in your new class, override type_info(), defining it to return a

reference to the static member.

Following the example in type_info.h, assume that we are adding a new class

named Foo. We would first add this line to "enum class ExampleTypes":

kFoo = 1

<

<

4

Then, we would define our class:

class Foo : public TypedReffable

<ExampleTypeInfo

> {

public:

static const TypeInfo kTypeInfo; // TypeInfo is typedeffed in superclass

const TypeInfo

&

type_info() const override { return kTypeInfo; }

};

For a working example, see typed_reffable_unittest.cc.