Menene matsalar diamand a cikin jerin jeri gari?

Question

Accepted Answer

**Matsalar diamand** tana tasowa ne lokacin da ajiya ta hangi daga jeri biyu wadanda suke da tipù gida, suna kawo jiya: idan jeri biyu na tsakiya suka yi koda hanya (ko suke da filin), wanne sigar da ka yi ajiya??

## Diamand

```text
        A  (defines greet())
       / \
      B   C   (each may override greet())
       \ /
        D   ← inherits from B and C: which greet()?
```

## A cikin Python (wanda yake ba da izini jerin jeri gari)

```python
class A:
    def greet(self): return "A"
class B(A):
    def greet(self): return "B"
class C(A):
    def greet(self): return "C"
class D(B, C):                  # multiple inheritance
    pass

print(D().greet())             # "B"  — resolved by MRO, not ambiguous
print(D.__mro__)               # D → B → C → A → object  (C3 linearization)
```

Python ya warware shi a sarari ta hanyar **Tsarin Warwajewar Hanya (MRO)** ta hanyar yin amfani da C3 linearization, kuma `super()` yana aiki tare da tsarin.

## Yadda harsunin ke jiyawa

| Harsu | Hanya |
|---|---|
| C++ | Yana ba da izini; jiya ba jiya ce ba sai idan ba ka sadauwa, ko ba da `virtual` jeri don raba tushe idi |
| Java/C# | **Kawar** jerin jeri gari ajiya; ba da izini da yawa *interfaces* (babu jiha, don haka babu diamand na bayanai) |
| Python | Yana ba da izini; kuma jiyawa via MRO (C3) |
| Scala | **Traits** tare da tsarin linearization da aka saita |

## Abubuwan taba

Harakat tare da MRO, jerin jeri gari na *jiha* yana zama rikitarwa da sauri — tushe biyu na jimita, sararin `super()` mai mamaki. Interfaces/traits (hali, ba jiha) sun tsorata mafi yawan zafi.

## Me ya sa ya matuhu

Yan yi bayani game da manyan wariya a yankin tsarin harsu: Java da C# sun kawar jerin jeri gari ajiya a takaice don kawar jiya na jiya, suna bayar da interfaces a maimakon.

Janiya MRO yana aiki a Python: `super()` mai hadibi da jujjuya biyu kawai ba su bugi hanya sai da suka ga yadda diamand ta zama linearized.

Harsu	Hanya
C++	Yana ba da izini; jiya ba jiya ce ba sai idan ba ka sadauwa, ko ba da `virtual` jeri don raba tushe idi
Java/C#	Kawar jerin jeri gari ajiya; ba da izini da yawa interfaces (babu jiha, don haka babu diamand na bayanai)
Python	Yana ba da izini; kuma jiyawa via MRO (C3)
Scala	Traits tare da tsarin linearization da aka saita