20 General utilities library [utilities]

20.11 Smart pointers [smartptr]

20.11.1 Class template unique_­ptr [unique.ptr]

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

20.11.1.2.3 Assignment [unique.ptr.single.asgn]

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unique_ptr& operator=(unique_ptr&& u) noexcept;
1
#
Constraints: is_­move_­assignable_­v<D> is true.
2
#
Preconditions: If D is not a reference type, D meets the Cpp17MoveAssignable requirements (Table 30) and assignment of the deleter from an rvalue of type D does not throw an exception.
Otherwise, D is a reference type; remove_­reference_­t<D> meets the Cpp17CopyAssignable requirements and assignment of the deleter from an lvalue of type D does not throw an exception.
3
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Effects: Calls reset(u.release()) followed by get_­deleter() = std​::​forward<D>(u.get_­deleter()).
4
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Returns: *this.
5
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Postconditions: u.get() == nullptr.
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template<class U, class E> unique_ptr& operator=(unique_ptr<U, E>&& u) noexcept;
6
#
Constraints:
  • (6.1)
    unique_­ptr<U, E>​::​pointer is implicitly convertible to pointer, and
  • (6.2)
    U is not an array type, and
  • (6.3)
    is_­assignable_­v<D&, E&&> is true.
7
#
Preconditions: If E is not a reference type, assignment of the deleter from an rvalue of type E is well-formed and does not throw an exception.
Otherwise, E is a reference type and assignment of the deleter from an lvalue of type E is well-formed and does not throw an exception.
8
#
Effects: Calls reset(u.release()) followed by get_­deleter() = std​::​forward<E>(u.get_­deleter()).
9
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Returns: *this.
10
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Postconditions: u.get() == nullptr.
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unique_ptr& operator=(nullptr_t) noexcept;
11
#
Effects: As if by reset().
12
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Postconditions: get() == nullptr.
13
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Returns: *this.