What are some examples of SFINAE in C++?

Can you explain what SFINAE is in C++?

SFINAE stands for Substitution Failure Is Not An Error. It's a C++ feature that allows template specialization to fail without causing a compilation error.

Can you give me an example of SFINAE in action?

Sure! Here's a simple example: You can use SFINAE to enable a function only if a type has a specific member function.

How does that work in code?

You can use std::enable_if along with template specialization to check for the existence of a member function. Here's a code snippet:

template <typename T, typename = void>
struct has_member_function : std::false_type {};

template <typename T>
struct has_member_function<T, std::void_t<decltype(std::declval<T>().memberFunction())>> : std::true_type {};

What are some common use cases for SFINAE?

Common use cases include type traits, function overloading based on type properties, and creating more flexible APIs.