什么是裸指针？ [英] Whats a naked pointer?

问题描述

观察裸指针（见第一个回复），问题很简单：

/ p>

什么是裸指针？

解决方案

/ p>

  #include< memory> 
 
 struct X {int a，b，c; }; 
 
 int main（）
 {
 std :: shared_ptr< X> sp（new X）; 
 X * np = new X; 
 delete np; 
} 
  

np 对象类型 X - 如果你动态分配（ new / malloc ）这个对象，你必须 delete / free it ...简单的指针，如 np 称为裸指针。

sp 是一个包含指向托管资源的指针的对象，这意味着您可以像使用 np 一样使用它，但是当没有 shared_ptr 拥有此资源的对象，资源被释放，因此您不必 delete 。 智能指针负责内存管理，因此您不必：）

Observing Naked Pointers (see the first reply), the questions is pretty simple:

what is a Naked Pointer?

解决方案

Here's simple example:

#include <memory>

struct X { int a,b,c; };

int main()
{
    std::shared_ptr<X> sp(new X);
    X* np = new X;
    delete np;
}

np is pointer to object of type X - if you have dynamically allocated (new / malloc) this object, you have to delete / free it... simple pointer like np is called "naked pointer".

sp is an object that holds a pointer to the managed resource, which means you can use it just like you would use np, but when there are no shared_ptr objects that own this resource, the resource is freed, so you don't have to delete it. Smart pointers take care of memory management, so you don't have to ;)

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