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### 2598. `addressof` works on temporaries

Section: 20.10.10 [specialized.addressof] Status: C++17 Submitter: Brent Friedman Opened: 2016-03-06 Last modified: 2017-07-30

Priority: 3

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Discussion:

LWG issue 970 removed the rvalue reference overload for `addressof`. This allows const prvalues to bind to a call to `addressof`, which is dissimilar from the behavior of `operator&`.

>     const vector<int> a();

>     void b()
>     {
>       auto x = addressof(a()); // "ok"
>       auto y = addressof<const int>(0); // "ok"
>       auto z = &a(); //error: cannot take address of a temporary
>     }

[2016-08 Chicago]

Tues PM: Move to Tentatively Ready

Proposed resolution:

This wording is relative to N4582.

1. Change 20.10.2 [memory.syn], header `<memory>` synopsis, as indicated:

   >     […]
   >     // 20.9.12, specialized algorithms:
   >     template <class T> constexpr T* addressof(T& r) noexcept;
   >     template <class T> const T* addressof(const T&& elem) = delete;
   >     […]

2. Change 20.10.10 [specialized.addressof] p1 as indicated:

   >     template <class T> constexpr T* addressof(T& r) noexcept;
   >     template <class T> const T* addressof(const T&& elem) = delete;

   > > -1- Returns: The actual address of the object or function referenced by `r`, even in the presence of an overloaded `operator&`.