How to check for the type of a template parameter?

Question

Suppose I have a template function and two classes

class animal {
}
class person {
}

template
void foo() {
  if (T is animal) {
    kill();
          


        

Answer 1

In C++17, we can use variants.

To use std::variant, you need to include the header:

#include 

After that, you may add std::variant in your code like this:

using Type = std::variant;

template 
void foo(Type type) {
    if (std::is_same_v) {
        // Do stuff...
    } else {
        // Do stuff...
    }
}