What's the C Equivalent of Java's `instanceof` Operator?

C Equivalence of Java's instanceof

In C , the equivalent of Java's instanceof operator for determining an object's type is dynamic_cast. It provides runtime type information when compiled with runtime type identification (RTTI) support enabled.

To use dynamic_cast, follow this syntax:

if(NewType* v = dynamic_cast<NewType*>(old)) {
   // Type conversion successful
}

However, it's important to consider potential drawbacks before using dynamic_cast. Runtime type checking, while useful in certain scenarios, can indicate poor design principles. Alternative approaches include:

• Virtual Functions: Introducing virtual functions in a base class that can be overridden in derived classes, allowing for specific behaviors to be implemented.
• Visitor Patterns: Separating interface from implementation, enabling the introduction of specific behaviors for subclasses without modifying the interface.

While dynamic_cast is widely used, keep in mind its potential cost. A workaround that may suffice in many cases is to add an enum representing object types and perform static casts based on the enum value.

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