When should I use enable_if in C++?

What is enable_if in C++ and when should I use it?

enable_if is a template metaprogramming utility that allows you to conditionally enable or disable function templates based on type traits.

Can you give me an example of how to use enable_if?

Sure! You can use enable_if to enable a function only if a certain condition is met, like this:

#include <type_traits>

template<typename T>
typename std::enable_if<std::is_integral<T>::value, T>::type
add(T a, T b) {
    return a + b;
}

What are the benefits of using enable_if?

It helps in creating more robust and type-safe code by allowing function overloads based on type properties.

Are there any alternatives to enable_if?

Yes, you can use concepts in C++20 or SFINAE (Substitution Failure Is Not An Error) as alternatives.