假设sp2 是一个初始化的shared_ptr。 //Initialize with copy constructor. Increments ref count.auto sp3(sp2);//Initialize via assignment. Increments ref count.auto sp4 =sp2;//Initialize with nullptr. sp7 is empty.shared_
c++複製 //Initialize with copy constructor. Increments ref count.autosp3(sp2);//Initialize via assignment. Increments ref count.autosp4 = sp2;//Initialize with nullptr. sp7 is empty.shared_ptr<Song> sp7(nullptr);// Initialize with another shared_ptr. sp1 and sp2// swap pointers as well a...
unique_ptr 指针与其所指对象的关系:在智能指针生命周期内,可以改变智能指针所指对象,如创建智能指针时通过构造函数指定、通过 reset 方法重新指定、通过 release 方法释放所有权、通过移动语义转移所有权,unique_ptr 还可能没有对象,这种情况被称为 empty。[6] ^{[6]} [6] 。 unique_ptr的基本操作有: //智能...
template<class Ty> class shared_ptr { public: typedef Ty element_type; shared_ptr(); shared_ptr(nullptr_t); shared_ptr(const shared_ptr& sp); shared_ptr(shared_ptr&& sp); template<class Other> explicit shared_ptr(Other * ptr); template<class Other, class D> shared_ptr(Other * ptr...
no arguments: The resulting object is an empty shared_ptr object or an empty weak_ptr object. ptr: A pointer of type Other* to the resource to be managed. T must be a complete type. If the function fails (because the control block can't be allocated), it evaluates the expression dele...
sp7 is empty. shared_ptr<Song> sp7(nullptr); // Initialize with another shared_ptr. sp1 and sp2 // swap pointers as well as ref counts. sp1.swap(sp2); 예 3 shared_ptr은 요소를 복사하는 알고리즘을 사용할 때 C++ 표준 템플릿 라이브...
no arguments -- the resulting object is an emptyshared_ptrobject or an emptyweak_ptrobject. ptr -- a pointer of type Other* to the resource to be managed. Ty must be a complete type. If the function fails (because the control block cannot be allocated) it evaluates the expression delete...
no arguments -- the resulting object is an emptyshared_ptrobject or an emptyweak_ptrobject. ptr-- a pointer of typeOther*to the resource to be managed.Tmust be a complete type. If the function fails (because the control block cannot be allocated) it evaluates the expressiondelete ptr. ...
template<class Ty> class shared_ptr { public: typedef Ty element_type; shared_ptr(); shared_ptr(nullptr_t); shared_ptr(const shared_ptr& sp); shared_ptr(shared_ptr&& sp); template<class Other> explicit shared_ptr(Other * ptr); template<class Other, class D> shared_ptr(Other * ptr...
no arguments -- the resulting object is an emptyshared_ptrobject or an emptyweak_ptrobject. ptr -- a pointer of type Other* to the resource to be managed. Ty must be a complete type. If the function fails (because the control block cannot be allocated) it evaluates the expression delete...