Question

A function cannot be overloaded by only by its return type

Answer 1

There's only one function in C++ that can be overloaded by return type, the implicit conversion operator special function, named operator T() (with T varying). No, you can't overload based on the return type. ... — Function declarations that differ only in the return type cannot be overloaded

Answer 2

Answer:

a function cannot be overloaded only by its return type