boost::openmethod::virtual_traits<std::shared_ptr<Class> const&, Registry>

Specialize virtual_traits for std::shared_ptr by reference.

Synopsis

Declared in <boost/openmethod/interop/std_shared_ptr.hpp>

template<
    class Class,
    class Registry>
struct virtual_traits<std::shared_ptr<Class> const&, Registry>;

Example

struct Animal {
    virtual ~Animal() = default;
};
struct Dog : Animal {};
struct Cat : Animal {};

BOOST_OPENMETHOD_CLASSES(Animal, Dog, Cat);

BOOST_OPENMETHOD(poke, (virtual_<const std::shared_ptr<Animal>&>), std::string);

BOOST_OPENMETHOD_OVERRIDE(
    poke, (const std::shared_ptr<Dog>& animal), std::string) {
    return "bark";
}

BOOST_OPENMETHOD_OVERRIDE(
    poke, (const std::shared_ptr<Cat>& animal), std::string) {
    return "hiss";
}

Passing a std::shared_ptr in a method call by const reference creates a temporary std::shared_ptr and passes it by const reference to the overrider. This is necessary because virtual arguments need to be cast to the type expected by the overrider.