Explain the Concept of SFINAE (Substitution Failure Is Not An Error) in C++
SFINAE stands for “Substitution Failure Is Not An Error.” It allows for selective function template instantiation.
It works by determining if a template argument substitution can succeed. If it fails, the compiler moves to other candidates instead of producing an error.
template
typename std::enable_if::value, T>::type
check(T t) { return t; }
SFINAE enables function overloading and enhances code flexibility. It is mainly used in template metaprogramming.
By using SFINAE, you can create highly adaptable and reusable templates, improving your code’s flexibility and efficiency.