C ++的new运算符可以在现实生活中抛出异常吗? [英] Can the C++ `new` operator ever throw an exception in real life?

问题描述

new运算符可以在现实生活中引发异常吗?

Can the new operator throw an exception in real life?

如果是这样，除了杀死我的应用程序之外，我是否还有其他处理此类异常的选项?

And if so, do I have any options for handling such an exception apart from killing my application?

更新:

在没有内存的情况下，是否有任何现实世界中的重载应用程序检查故障并恢复?

Do any real-world, new-heavy applications check for failure and recover when there is no memory?

• >您多久检查一次在C ++新指令中出现异常?
• 测试回报是否有用C ++中的新"?
• 在任何情况下新的返回值都为NULL吗?

• How often do you check for an exception in a C++ new instruction?
• Is it useful to test the return of "new" in C++?
• Will new return NULL in any case?

推荐答案

new运算符和new []运算符应抛出std::bad_alloc，但这并非总是如此，因为有时可以覆盖该行为.

The new operator, and new[] operator should throw std::bad_alloc, but this is not always the case as the behavior can be sometimes overridden.

一个人可以使用std::set_new_handler，突然之间可能会发生与抛出std::bad_alloc完全不同的事情.尽管标准要求用户要么使内存可用，中止或抛出std::bad_alloc.但是，当然并非如此.

One can use std::set_new_handler and suddenly something entirely different can happen than throwing std::bad_alloc. Although the standard requires that the user either make memory available, abort, or throw std::bad_alloc. But of course this may not be the case.

免责声明:我不建议这样做.

Disclaimer: I am not suggesting to do this.

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