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#include <iostream>
 
class Foo {
public:
  Foo() {
    std::cout << "constructed\n";
  }
  ~Foo() {
    std::cout << "destructed\n";
  }
};
 
Foo getFoo() {
  return Foo();
}
 
void fz(Foo& f) {
}
 
int getInt() {
  return int();
}
 
void iz(int& i) {
}
 
int main() {
  {
    Foo& z = getFoo(); //ok
    fz(getFoo()); //ok
 
    int& z2 = getInt(); //error: initial value of reference to non-const must be an lvalue
    iz(getInt()); //same as above
  }
}

prog.cpp: In function ‘int main()’:
prog.cpp:29:21: error: invalid initialization of non-const reference of type ‘Foo&’ from an rvalue of type ‘Foo’
prog.cpp:30:16: error: invalid initialization of non-const reference of type ‘Foo&’ from an rvalue of type ‘Foo’
prog.cpp:17:6: error: in passing argument 1 of ‘void fz(Foo&)’
prog.cpp:32:22: error: invalid initialization of non-const reference of type ‘int&’ from an rvalue of type ‘int’
prog.cpp:33:16: error: invalid initialization of non-const reference of type ‘int&’ from an rvalue of type ‘int’
prog.cpp:24:6: error: in passing argument 1 of ‘void iz(int&)’
prog.cpp:29:10: warning: unused variable ‘z’ [-Wunused-variable]
prog.cpp:32:10: warning: unused variable ‘z2’ [-Wunused-variable]

Standard output is empty