namespace std {
template <class T, class D> class unique_ptr<T[], D> {
public:
using pointer = see below;
using element_type = T;
using deleter_type = D;
// [unique.ptr.runtime.ctor], constructors
constexpr unique_ptr() noexcept;
template <class U> explicit unique_ptr(U p) noexcept;
template <class U> unique_ptr(U p, see below d) noexcept;
template <class U> unique_ptr(U p, see below d) noexcept;
unique_ptr(unique_ptr&& u) noexcept;
template <class U, class E>
unique_ptr(unique_ptr<U, E>&& u) noexcept;
constexpr unique_ptr(nullptr_t) noexcept : unique_ptr() { }
// destructor
~unique_ptr();
// assignment
unique_ptr& operator=(unique_ptr&& u) noexcept;
template <class U, class E>
unique_ptr& operator=(unique_ptr<U, E>&& u) noexcept;
unique_ptr& operator=(nullptr_t) noexcept;
// [unique.ptr.runtime.observers], observers
T& operator[](size_t i) const;
pointer get() const noexcept;
deleter_type& get_deleter() noexcept;
const deleter_type& get_deleter() const noexcept;
explicit operator bool() const noexcept;
// [unique.ptr.runtime.modifiers], modifiers
pointer release() noexcept;
template <class U> void reset(U p) noexcept;
void reset(nullptr_t = nullptr) noexcept;
void swap(unique_ptr& u) noexcept;
// disable copy from lvalue
unique_ptr(const unique_ptr&) = delete;
unique_ptr& operator=(const unique_ptr&) = delete;
};
}
A specialization for array types is provided with a slightly altered interface.
Conversions between different types of unique_ptr<T[], D> that would be disallowed for the corresponding pointer-to-array types, and conversions to or from the non-array forms of unique_ptr, produce an ill-formed program.
Pointers to types derived from T are rejected by the constructors, and by reset.
The observers operator* and operator-> are not provided.
The indexing observer operator[] is provided.
The default deleter will call delete[].
Descriptions are provided below only for members that differ from the primary template.
The template argument T shall be a complete type.
template <class U> explicit unique_ptr(U p) noexcept;
template <class U> unique_ptr(U p, see below d) noexcept;
template <class U> unique_ptr(U p, see below d) noexcept;
These constructors behave the same as the constructors that take a pointer parameter in the primary template except that they shall not participate in overload resolution unless either
U is the same type as pointer,
U is nullptr_t, or
pointer is the same type as element_type*, U is a pointer type V*, and V(*)[] is convertible to element_type(*)[].
template <class U, class E>
unique_ptr(unique_ptr<U, E>&& u) noexcept;
This constructor behaves the same as in the primary template, except that it shall not participate in overload resolution unless all of the following conditions hold, where UP is unique_ptr<U, E>:
U is an array type, and
pointer is the same type as element_type*, and
UP::pointer is the same type as UP::element_type*, and
UP::element_type(*)[] is convertible to element_type(*)[], and
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: This replaces the overload-resolution specification of the primary template — end note ]
template <class U, class E>
unique_ptr& operator=(unique_ptr<U, E>&& u)noexcept;
This operator behaves the same as in the primary template, except that it shall not participate in overload resolution unless all of the following conditions hold, where UP is unique_ptr<U, E>:
U is an array type, and
pointer is the same type as element_type*, and
UP::pointer is the same type as UP::element_type*, and
UP::element_type(*)[] is convertible to element_type(*)[], and
is_assignable_v<D&, E&&> is true.
[ Note: This replaces the overload-resolution specification of the primary template — end note ]
T& operator[](size_t i) const;
Requires: i < the number of elements in the array to which the stored pointer points.
Returns: get()[i].
void reset(nullptr_t p = nullptr) noexcept;
Effects: Equivalent to reset(pointer()).
template <class U> void reset(U p) noexcept;
This function behaves the same as the reset member of the primary template, except that it shall not participate in overload resolution unless either
U is the same type as pointer, or
pointer is the same type as element_type*, U is a pointer type V*, and V(*)[] is convertible to element_type(*)[].