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### 1402. `nullptr` constructors for smart pointers should be `constexpr`

Section: 20.10 [memory] Status: C++11 Submitter: BSI Opened: 2010-08-25 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

Addresses GB-100

The `unique_ptr` and `shared_ptr` constructors taking `nullptr_t` delegate to a `constexpr` constructor, and could be `constexpr` themselves.

[ Resolved in Rapperswil by a motion to directly apply the words from the ballot comment in N3102. ]

Proposed resolution:

In the 20.11.1.3 [unique.ptr.single] synopsis add "constexpr" to `unique_ptr(nullptr_t)`.
In the 20.11.1.4 [unique.ptr.runtime] synopsis add "constexpr" to `unique_ptr(nullptr_t)`.
In the 20.11.3 [util.smartptr.shared] synopsis add "constexpr" to `shared_ptr(nullptr_t)`.