define_method
defined in <yorel/yomm2/cute.hpp>, also provided by <yorel/yomm2/keywords.hpp></sub>
#define_method(/*unspecified*/) /*unspecified*/
define_method(return-type, name, (method-parameter-list)) {
...
}
define_method(container, return-type, name, (method-parameter-list)) {
...
}
Add a definition to a method.
Locate a method with the same name, with a signature compatible with
method-parameter-list, and add the definition to the method’s list of
definitions. The method must exist and must be unique. return-type must be
compatible with the method’s return type. return-type may be auto.
The types of the arguments must not be decorated with virtual_.
Inside the block, a function pointer named next points to the next most
specific definition, if one exists, and it is unique. Otherwise, next points
to an error handler, which writes a message to stderr, and terminates the
program via abort. The handler can be customized. See
set_method_call_error_handler.
See the documentation of declare_method for information on handling types that contain commas.
If container is specified, the method definition is placed inside the
container, which must have been declared with method_container. See the
documentation of method_container for more information on method containers.
#include <string>
#include <yorel/yomm2/keywords.hpp>
struct Animal { virtual ~Animal() {} };
struct Dog : Animal {};
struct Bulldog : Dog {};
register_classes(Animal, Dog, Bulldog);
declare_method(std::string, kick, (virtual_<Animal*>));
define_method(std::string, kick, (Dog* dog)) {
return "bark";
}
define_method(std::string, kick, (Bulldog* dog)) {
return next(dog) + " and bite";
}
BOOST_AUTO_TEST_CASE(ref_example) {
yorel::yomm2::update();
Dog snoopy;
Bulldog hector;
Animal* animal;
animal = &snoopy;
BOOST_TEST(kick(animal) == "bark");
animal = &hector;
BOOST_TEST(kick(animal) == "bark and bite");
}