Effective C++ 17. Store newed objects in smart pointers in standalone statements

原创于 2017-10-26 15:26:08 发布 · 188 阅读

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本文探讨了在C++中使用智能指针处理异常的方法，特别是如何安全地结合new操作符与智能指针来避免内存泄漏。通过示例说明了在调用过程中可能出现的问题，并给出了正确的实践方式。

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int priority();
void processWidget(std::tr1::shared_ptr<Widget> pw, int priority);

// it won't compile, tr1::shared_ptr constructor 
// taking a raw pointer is explicit
processWidget(new Widget, priority());

processWidget(std::tr1::shared_ptr<Widget>(new Widget), priority());

the order of performing maybe
1. Execute “new Widget”.
2. Call priority.
3. Call the tr1::shared_ptr constructor.
If the call to priority yields an exception, the pointer returned from “new Widget” will be lost.

// Store newed objects in smart pointers in standalone statements
std::tr1::shared_ptr<Widget> pw(new Widget);
processWidget(pw, priority());