What is the difference between generics and templates in C++?

What is the difference between generics and templates in C++?

Generics and templates in C++ both allow for code reusability, but they are implemented differently. Generics are a feature of languages like Java, while templates are a C++ feature that allows functions and classes to operate with any data type.

Can you give me an example of how templates work in C++?

Sure! Here's a simple example of a template function in C++:

template <typename T>
T add(T a, T b) {
    return a + b;
}

This function can add two numbers of any type, like integers or floats.

How do generics in Java compare to C++ templates?

Generics in Java are implemented through type erasure, meaning the type information is not available at runtime. In contrast, C++ templates are resolved at compile time, allowing for more flexibility and performance optimizations.

Are there any performance differences between using templates and generics?

Yes, templates can lead to better performance in C++ because they are resolved at compile time, allowing for optimizations. Generics in Java may introduce some overhead due to type erasure.