What are some common use cases for SFINAE in C++?

What are some common use cases for SFINAE in C++?

SFINAE, or Substitution Failure Is Not An Error, is often used in template metaprogramming. Common use cases include type traits, enabling/disabling functions based on type properties, and creating more flexible APIs.

Can you give an example of how SFINAE is used in type traits?

Sure! One common example is using SFINAE to check if a type is a pointer. You can create a template that only enables a function if the type is a pointer, using std::enable_if.

What about using SFINAE for function overloading?

Great question! SFINAE allows you to overload functions based on type characteristics. For instance, you can have one version of a function for integral types and another for floating-point types.

Are there any performance implications when using SFINAE?

Generally, SFINAE doesn't have significant performance overhead at runtime, but it can increase compile times due to the complexity of template instantiation.