使非对象资源符合RAII

本文介绍了使非对象资源符合RAII的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

在我的代码中，我使用了windows.h中的HANDLE.它们的用法就像

in my code I use HANDLEs from windows.h. They are used like

HANDLE h;
if (!openHandleToSomething(arg1, arg2, &h)) {
    throw std::exception("openHandleToSomething error");
}
/* Use the handle in other functions which can throw as well */
if (!CloseHandle(h)) {
    throw std::exception("closeHandle error");
}

如您所见，您必须将此CloseHandle插入到在获取和发布过程中可能发生的每个异常.因此，很可能您忘记了一个(或者有一个您不知道的奇特的SEH异常)，然后发现内存泄漏.

As you see, you have to insert this CloseHandle to every exception which can happen in the middle of acquiration and release. Therefore, it's likely you forget one (or there is a fancy SEH exception which you didn't know about) and voilà, you have your memory leak.

最近，我读到有关RAII的信息，它应该可以消除此类情况下的头痛，并应自动将其称为CloseHandle.我还看到C ++中有类似std::auto_ptr<someType>的东西可以解决使用new分配的资源的问题.

Recently, I've read about RAII which should remove the headaches from such cases and should call this CloseHandle automatically. I've also seen that there is something like std::auto_ptr<someType> in C++ which solves the problem for resources which were allocated with new.

但是，由于我不使用new，并且由于HANDLE只是被typedef修改为void *，所以我想知道如何使用std::auto_ptr<someType>.以某种方式，应该有可能为其提供自定义删除器功能(if (!CloseHandle(h)) { throw std::exception("closeHandle error"); }).创建类将是另一种方法，因为只要析构函数的实例超出范围，就会调用该析构函数.但是，为每一个简单的事情都上一堂课是太过分了.

However, since I don't use new and since HANDLE is just typedefed to be a void *, I wonder how I should use the std::auto_ptr<someType>. Somehow, it should be possible to give it a custom deleter function (if (!CloseHandle(h)) { throw std::exception("closeHandle error"); }). Creating a class would be another method since the destructor gets called any time an instance of it gets out of scope. However, it's just overkill to have a class for every simple thing.

如何解决这些意外的内存泄漏?

How can I fix these accidential memory leaks?

请注意，我更喜欢纯C ++，无库且无大依赖项的解决方案，除非它们确实很小，并且无论如何都在大多数环境中使用.

Note that I would prefer solutions which are in pure C++ with no libraries and big dependencies except if they are really small and used in most of the environments anyways.

CloseHandle

使非对象资源符合RAII

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