int main(array ^args)中的^

最新推荐文章于 2020-12-11 09:26:45 发布

转载最新推荐文章于 2020-12-11 09:26:45 发布 · 734 阅读

文章标签：

#object #asynchronous #pointers #reference #c

本文介绍了在托管堆上创建对象句柄的方法及其重要性。使用^符号声明的对象句柄可以跟踪指向托管堆中对象的引用，使得垃圾回收器能够在移动对象时更新这些引用。文章还解释了为何常规C++指针和引用无法实现精确跟踪。

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A handle to an object on the managed heap points to the "whole" object, and not to a member of the object.

See gcnew for information on how to create an object on the managed heap.

In Visual C++ 2002 and Visual C++ 2003, __gc * was used to declare an object on the managed heap. The ^ replaces __gc * in the new syntax.

The common language runtime maintains a separate heap on which it implements a precise, asynchronous, compacting garbage collection scheme. To work correctly, it must track all storage locations that can point into this heap at runtime. ^ provides a handle through which the garbage collector can track a reference to an object on the managed heap, thereby being able to update it whenever that object is moved.

Because regular C++ pointers (*) and references (&) cannot be tracked precisely, a handle-to object declarator is used.

Member selection through a handle (^) uses the pointer-to-member operator (->).