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Observe the code snippet below. The first piece of code is a declaration contained in a header file. The second is a first draft of the definition, contained in an implementation file, which simply copies the declaration's signature. Assuming I want to use a and b in the implementation, which two parts of the signature can be left out of the definition while the program remains correct and add behaves the same?
// .hpp
struct A {
int add(const int a, const int b = 3) const &&;
};
// .cpp
int A::add(const int a, const int b = 3) const && {
const auto c = a + b;
return c;
}