Does the unary + operator have any practical use?

Question

Was the unary + operator only included for symmetry with the unary - operator, or does it find some practical use in C++ code?

Searching h

Answer 1

Unary + applies integral promotions. @PeteBecker's answer shows one way that can be useful.

For another, note that an unscoped enumeration type gets promoted to an integer type which can represent all values in the enum. So in C++03, even without C++11's std::underlying_type, you could do:

enum MyBitMask {
    Flag1 = 0x1,
    Flag2 = 0x2,
    Flag3 = 0x4,
    Flag4 = 0x8000000
};

inline MyBitMask operator&(MyBitMask x, MyBitMask y) {
    return static_cast( +x & +y );
}

inline MyBitMask operator|(MyBitMask x, MyBitMask y) {
    return static_cast( +x | +y );
}