What is SFINAE in C++ templates?

What is SFINAE in C++ templates?

SFINAE stands for Substitution Failure Is Not An Error. It's a C++ template feature that allows the compiler to ignore certain template instantiations when they fail, rather than producing a compilation error.

Can you give me an example of how SFINAE works?

Sure! Here's a simple example: You can use SFINAE to enable a function only if a certain type has a specific member function. For instance, if you have a class with a method foo(), you can create a template that checks for its existence.

What are the practical uses of SFINAE?

SFINAE is commonly used in template metaprogramming, for creating type traits, and for enabling/disabling functions based on type properties.

Are there any alternatives to SFINAE?

Yes, alternatives include concepts (introduced in C++20) and static assertions, which can also help in type checking and function overloading.