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#include <exception>
#include <iostream>
 
struct S : std::exception {
  const char *what() const noexcept override {
    return "My custom exception";
  }
};
 
void f() {
  try {
    throw S();
  } catch (std::exception Ee) {
    std::cout << Ee.what() << std::endl;
  }
}

#include <exception>
#include <iostream>
 
struct S : std::exception {
  const char *what() const noexcept override {
    return "My custom exception";
  }
};
 
void f() {
  try {
    throw S();
  } catch (std::exception &Ee) {
    std::cout << Ee.what() << std::endl;
  }
}