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

Since for arithmetic variables operator+ generates a new value, I use it in general to generate value copies of reference-like (proxy) types.

template class ref_of{
   T* impl_; // or a more complicated implementation
public:
   T operator+() const{return *impl_;} 
   operator T&()&{return *impl_;}
}
...
ref_of r = t;
auto s = +r; // this forces a copy

Another option is to use operator* but then the ref_of can be confused with a pointer-like object.