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unique_ptr::unique_ptr

There are seven constructors for unique_ptr.

unique_ptr();
unique_ptr(nullptr_t);
explicit unique_ptr(
    pointer _Ptr
);
unique_ptr(
    Type *_Ptr,
    typename conditional<
        is_reference<Del>::value, 
        Del,
        typename add_reference<const Del>::type>::type _Deleter
);
unique_ptr(
    pointer ptr,
    typename remove_reference<Del>::type&& _Deleter
);
unique_ptr(
    unique_ptr&& _Right
);
template<class Ty2, Class Del2>
    unique_ptr(
        unique_ptr<Ty2, Del2>&& _Right
    );

Parameter

Description

_Ptr

A pointer to the resource to be assigned to a unique_ptr.

_Deleter

A deleter to be assigned to a unique_ptr.

_Right

An rvalue reference to a unique_ptr from which unique_ptr fields are move assigned to the newly constructed unique_ptr.

The first two constructors construct an object that manages no resource. The third constructor stores ptr in stored_ptr. The fourth constructor stores ptr in stored_ptr and deleter in stored_deleter.

The fifth constructor stores ptr in stored_ptr and moves deleter into stored_deleter. The sixth and seventh constructors store right.reset() in stored_ptr and moves right.get_deleter() into stored_deleter.

Header: <memory>

Namespace: std

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