20 Memory management library [mem]

20.3 Smart pointers [smartptr]

20.3.1 Unique-ownership pointers [unique.ptr]

20.3.1.4 unique_ptr for array objects with a runtime length [unique.ptr.runtime]

20.3.1.4.2 Constructors [unique.ptr.runtime.ctor]

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template<class U> constexpr explicit unique_ptr(U p) noexcept;
1
#
This constructor behaves the same as the constructor in the primary template that takes a single parameter of type pointer.
2
#
Constraints:
  • (2.1)
    U is the same type as pointer, or
  • (2.2)
    pointer is the same type as element_type*, U is a pointer type V*, and V(*)[] is convertible to element_type(*)[].
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template<class U> constexpr unique_ptr(U p, see below d) noexcept; template<class U> constexpr unique_ptr(U p, see below d) noexcept;
3
#
These constructors behave the same as the constructors in the primary template that take a parameter of type pointer and a second parameter.
4
#
Constraints:
  • (4.1)
    U is the same type as pointer,
  • (4.2)
    U is nullptr_t, or
  • (4.3)
    pointer is the same type as element_type*, U is a pointer type V*, and V(*)[] is convertible to element_type(*)[].
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template<class U, class E> constexpr unique_ptr(unique_ptr<U, E>&& u) noexcept;
5
#
This constructor behaves the same as in the primary template.
6
#
Constraints: Where UP is unique_ptr<U, E>:
  • (6.1)
    U is an array type, and
  • (6.2)
    pointer is the same type as element_type*, and
  • (6.3)
    UP​::​pointer is the same type as UP​::​element_type*, and
  • (6.4)
    UP​::​element_type(*)[] is convertible to element_type(*)[], and
  • (6.5)
    either D is a reference type and E is the same type as D, or D is not a reference type and E is implicitly convertible to D.
[Note 1: 
This replaces the Constraints: specification of the primary template.
— end note]