qpid/cpp/src/qpid/amqp_0_10/visitors.h


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// Visitors
template <class Base> struct Visitor;
template <class Base, class F, class R> FunctorVisitor;

/** Template base implementation for visitables. */
template <class Base, class Derived>
struct VisitableBase : public Base {
    virtual void accept(Visitor<Derived>& v) {
        v.visit(static_cast<Derived>&(*this));
    }
    virtual void accept(Visitor<Derived>& v) const {
        v.visit(static_cast<const Derived>&(*this));
    }
};