yomm2

yorel::yomm2::policy::minimal_rtti
_{defined in <yorel/yomm2/policy.hpp>, also provided by <yorel/yomm2/core.hpp>, <yorel/yomm2/keywords.hpp>}

struct minimal_rtti;

Minimal implementation of rtti that does not use any actual runtime type information. This facet can be used in programs that call methods solely via virtual_ptrs created using the final constructs. Virtual inheritance is not supported. Classes are not required to be polymorphic.

Static member functions

Name	Description
type_id static_type<T>	return a type_id for T

static_type

template<class Class>
static type_id static_type();

Allocate a static char variable and return its address, cast to type_id.

Template parameters

• Class: a class registered via register_classes or use_classes.

Example

#include <string>
#include <vector>

#include <yorel/yomm2/keywords.hpp>
using namespace yorel::yomm2;

struct Animal {};
struct Cat : Animal {};
struct Dog : Animal {};

struct final_policy : policy::basic_policy<final_policy, policy::minimal_rtti> {
};

template<class Class>
using vptr = virtual_ptr<Class, final_policy>;

register_classes(Animal, Dog, Cat, final_policy);

declare_method(std::string, kick, (vptr<Animal>), final_policy);

define_method(std::string, kick, (vptr<Cat> cat)) {
    return "hiss";
}

define_method(std::string, kick, (vptr<Dog> dog)) {
    return "bark";
}

BOOST_AUTO_TEST_CASE(ref_static_rtti) {
    update<final_policy>();

    Cat felix;
    Dog snoopy;

    // type erasure:
    std::vector<vptr<Animal>> animals = {
        vptr<Animal>::final(felix),
        vptr<Animal>::final(snoopy),
    };

    BOOST_TEST(kick(animals[0]) == "hiss");
    BOOST_TEST(kick(animals[1]) == "bark");
}

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