Dynamic dispatch shine aikin lokaci na aiki wanda ke yanke shawar wane aiki na aiki na tuƙi dangane da nau'in tunani na jiya na abin, ba nau'in da aka bayyana na mai ɗaukar. Yawancin harsuna da suka dogara kan ajiya suna shi aiwatarwa tare da tebur na hanyar aiki na jinsi (vtable).
Kowa ajiya yana da tebur na nuni don aiwatarwar hanyoyi. Kowa abin yana da nuni mai asirin zuwa teburin ajiyarsa. Kira na jinsi ta zama:
Animal a = new Dog();
a.speak();
a ──▶ Dog object ──▶ [Dog vtable]
speak() ──▶ Dog.speak() ← chosen at RUNTIME
Maizin ba ya gida gida Animal.speak; yana tafiya "kira wuri N na ko daga tebur da wannan abin nufi."
Animal a = new Dog(); // declared Animal, actual Dog
a.speak(); // → Dog.speak(), because dispatch uses the OBJECT
| Harsuna | Shirye a gida | Bayanai |
|---|---|---|
| Java | Jinsi ta gida | final/static/private ba jinsi ba |
| C++ | Ba jinsi ta gida | Dole ne a yarda virtual don dynamic dispatch |
| Python | Koyaushe mai ɗinɗi | Bincikon hanya ta hanyar ajiya dict/MRO |
Ana da kaɗan farashin (sassaucin kai) kuma yana damje ɓura. A cikin C++, manta da virtual yana nufin kiran kusanya jiya kuma ba a kira abubuwan da suka dace a shiru ba — kuskuri mai sunan arzikin.
Jasantar dispatch yana bayyana me ya sa abubuwan da dace suna aiki kuma me ya sa nau'in da aka bayyana ba ya ƙaddara hali — tushen rudani.
Yakamata kuma a bayyana ainihin sakamakon: farashin aiki na kiran jinsi, me ya sa masu gida ba sai kira hanyoyin jinsi, kuma me ya sa C++ ke buƙatar virtual ta bayyane.