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What is a key trade-off or limitation when using multiple inheritance to solve the Diamond Problem in object-oriented design?

medium🪤 Complexity Trap Q13 of Q15
OOP & Design Patterns - Inheritance - Types, Method Resolution Order & Diamond Problem
What is a key trade-off or limitation when using multiple inheritance to solve the Diamond Problem in object-oriented design?
AMultiple inheritance always leads to ambiguous method calls that cannot be resolved.
BMultiple inheritance eliminates the need for Method Resolution Order (MRO).
CMultiple inheritance reduces code reuse compared to single inheritance.
DUsing multiple inheritance can increase complexity and make the class hierarchy harder to understand and maintain.
Step-by-Step Solution

  1. Step 1: Understand the Diamond Problem

    Diamond Problem arises when a class inherits from two classes that share a common ancestor, causing ambiguity.

  2. Step 2: Evaluate Multiple inheritance always leads to ambiguous method calls that cannot be resolved.

    Multiple inheritance can cause ambiguity, but languages use MRO to resolve it, so it is not always unresolved.

  3. Step 3: Evaluate Multiple inheritance eliminates the need for Method Resolution Order (MRO).

    MRO is essential in multiple inheritance to resolve method calls, so multiple inheritance does not eliminate MRO.

  4. Step 4: Evaluate Multiple inheritance reduces code reuse compared to single inheritance.

    Multiple inheritance generally increases code reuse by combining features from multiple classes.

  5. Step 5: Correct trade-off

    Using multiple inheritance can increase complexity and make the class hierarchy harder to understand and maintain. correctly identifies that multiple inheritance increases complexity and can make hierarchies harder to maintain.

  6. Final Answer:

    Option D -> Option D

  7. Quick Check:

    Complexity and maintainability are key trade-offs in multiple inheritance.
Quick Trick: Multiple inheritance = power with complexity cost
Common Mistakes:
MISTAKES
  • Believing multiple inheritance always causes irresolvable ambiguity
  • Thinking MRO is unnecessary with multiple inheritance
  • Assuming multiple inheritance reduces code reuse
Trap Explanation:
PITFALL
  • Options A and B reflect misunderstandings about ambiguity and MRO's role, while D incorrectly claims multiple inheritance reduces reuse, which is the opposite.
Interviewer Note:
CONTEXT
  • Tests candidate's understanding of practical trade-offs and limitations of multiple inheritance.
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