在C++ 中没有垃圾回收机制,必须自己释放分配的内存,否则就会造成内存泄露。解决这个问题最有效的方法是使用智能指针(smart pointer)。智能指针是存储指向动态分配(堆)对象指针的类,用于生存期的控制,能够确保在离开指针所在作用域时,自动地销毁动态分配的对象,防止内存泄露。智能指针的核心实现技术是引用计数,每使用它一...
可以通过delete 指针对象的方式回收 voiduse_pointer(){//开辟整形指针,指向一个值为5的元素int*pint =newint(5);//开辟指向字符串的指针string *pstr =newstring("hello zack");//释放pint指向的空间if(pint !=nullptr) {deletepint; pint =nullptr; }//释放指针指向的空间。if(pstr !=nullptr) {delete...
1.2悬空指针（Dangling Pointer）悬空指针指的是一个指针指向已经释放的内存，这时再通过这个指针访问内存...
std::shared_ptr is a smart pointer that retains shared ownership of an object through a pointer. Several shared_ptr objects may own the same object. https://en.cppreference.com/w/cpp/memory/shared_ptr 二、特性 shared_ptr 有两个特性:特性1:对raw pointer进行了一层封装,让C++程序员不用在担...
// Ensure your shared pointer is valid before dereferencing to avoid a potential assertion.if(MySharedPointer.IsValid()){MySharedReference=MySharedPointer.ToSharedRef();} Comparison You can test Shared Pointers against each other for equality. In this context, equality is defined as ...
private: __compressed_pair<pointer, deleter_type> __ptr_; 下面看下unique_ptr的构造函数。 template <class _Tp, class _Dp = default_delete<_Tp> > class _LIBCPP_TEMPLATE_VIS unique_ptr { public: // 默认构造函数,用pointer的默认构造函数初始化__ptr_ constexpr unique_ptr() noexcept : _...
(~)~/xxx/src/main/cpp/AndroidMediaPlayer.cpp:494:19: note: in instantiation of function template specialization 'std::ndk1::dynamic_pointer_cast<alexaClientSDK::applicationUtilities::androidUtilities::AndroidSLESEngine, void>' requested herem_engine = std::dynamic_pointer_castalexaClientSDK::...
scoped_ptr mimics a built-in pointer except that it guarantees deletion of the object pointed to, either on destruction of the scoped_ptr or via an explicit reset(). scoped_ptr is a simple solution for simple needs; use shared_ptr or std::auto_ptr if your needs are more complex. ...
C++ Shared Pointer - Learn about C++ shared pointers, their usage, benefits, and how they manage shared ownership of dynamically allocated objects in C++. Explore examples and best practices.
/xxx/src/main/cpp/AndroidMediaPlayer.cpp:494:19: note: in instantiation of function template specialization 'std::ndk1::dynamic_pointer_cast<alexaClientSDK::applicationUtilities::androidUtilities::AndroidSLESEngine, void>' requested here m_engine = std::dynamic_pointer_castalexaClientSDK::application...