What is the function of the monocular operator overloaded by C++

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C.166: overloaded unary operator & can only be used for smart pointers and references

Reason (reason)

The address operator is the basic element of C++, and many parts of C++ semantics set the default meaning for it.

Example (sample)

Class Ptr {/ / a somewhat smart pointer

Ptr (X* pp): P (pp) {/ * check * /}

X* operator- > () {/ * check * / return p;}

X operator [] (int I)

X operator* ()

Private:

T * p

}

Class X {

Ptr operator& () {return Ptr {this};}

/ /...

}

Note (Note)

If you want to provoke the & operator, make sure its result type and->, [], * and. Match. Pay attention. Operators cannot be overloaded now, so it is not possible to achieve a perfect system.

Enforcement (implementation recommendations)

It's not easy. Alarm if the & operator is customized but the-> operator is not defined for the result.

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