'How to limit templated function instantiation to certain type when call site is in the same file as function template definition?

// I only wanted these functions be used for certain types, e.g., say, int and float
template <typename T>
void func() {

}


void another_function() {
  func<int>(); // works
  func<float>();  // works
  func<string>(); // I want this to not compile
}

I think adding explicit instantiation in this file does not work because func and another_function are in the same translational unit. Is there another approach to handle this situation?

c++templates


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