23 General utilities library [utilities]

23.11 Smart pointers [smartptr]

23.11.1 Class template unique_­ptr [unique.ptr]

23.11.1.2 unique_­ptr for single objects [unique.ptr.single]

23.11.1.2.3 unique_­ptr assignment [unique.ptr.single.asgn]

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unique_ptr& operator=(unique_ptr&& u) noexcept;
1
#
Requires: If D is not a reference type, D shall satisfy the requirements of MoveAssignable (Table 25) and assignment of the deleter from an rvalue of type D shall not throw an exception.
Otherwise, D is a reference type; remove_­reference_­t<D> shall satisfy the CopyAssignable requirements and assignment of the deleter from an lvalue of type D shall not throw an exception.
2
#
Effects: Transfers ownership from u to *this as if by calling reset(u.release()) followed by get_­deleter() = std​::​forward<D>(u.get_­deleter()).
3
#
Returns: *this.
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template <class U, class E> unique_ptr& operator=(unique_ptr<U, E>&& u) noexcept;
4
#
Requires: If E is not a reference type, assignment of the deleter from an rvalue of type E shall be well-formed and shall not throw an exception.
Otherwise, E is a reference type and assignment of the deleter from an lvalue of type E shall be well-formed and shall not throw an exception.
5
#
Remarks: This operator shall not participate in overload resolution unless:
  • (5.1)
    unique_­ptr<U, E>​::​pointer is implicitly convertible to pointer, and
  • (5.2)
    U is not an array type, and
  • (5.3)
    is_­assignable_­v<D&, E&&> is true.
6
#
Effects: Transfers ownership from u to *this as if by calling reset(u.release()) followed by get_­deleter() = std​::​forward<E>(u.get_­deleter()).
7
#
Returns: *this.
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unique_ptr& operator=(nullptr_t) noexcept;
8
#
Effects: As if by reset().
9
#
Postconditions: get() == nullptr.
10
#
Returns: *this.