yorel::yomm2::class_declaration
defined in <yorel/yomm2/core.hpp>, also provided by <yorel/yomm2/keywords.hpp>
template<typename ClassList, typename... Unspecified>
struct class_declaration;
class_declaration<Class, Bases...> identifier;
class_declaration<types<Class, Bases...>> identifier;
Register Class and its direct Bases.
All classes that potentially take part in a method call must be registered with
class_declaration, along with the inheritance relationships.
Note that the registration requirement does not only apply to classes used as
virtual parameters, and the classes used as parameters in method definitions
that correspond to virtual parameters. The runtime class of all the objects
potentially partaking in method calls must be registered. For example, given
the hierarchy Animal -> Dog -> Bulldog; if a method declaration takes a
virtual_<Animal>; if the method has two definitions, one for Animal, and one
for Bulldog; and the program calls the method for a Dog (that is not a Bulldog);
then Dog must be registered as well.
struct Animal { virtual ~Animal() {} };
struct Dog : Animal {};
struct Bulldog : Dog {};
struct Cat : Animal {};
class_declaration<types<Animal>> register_animal;
class_declaration<types<Dog, Animal>> register_dog;
class_declaration<types<Bulldog, Dog>> register_bulldog;
class_declaration<types<Cat, Animal>> register_cat;
class_declaration is a low level construct. It is recommended to use
use_classes instead, which can register many classes, and their inheritance
relationships, using a single registration object.