使用新分配内存时，是否需要检查空？ [英] Do I Need To Check For Null When Allocating The Memory Using New?

问题描述

大家好，



请为此建议答案。在我的代码中，我分配内存如下所示。

Hi all,

Please suggest the answer for this. In my code I am allocating the memory like as below.

voice_buffer = new char[no_of_bytes + 20];
input_file->ReadData(voice_buffer,no_of_bytes);

这里我需要检查NULL条件还是需要添加此代码来尝试catch块？

Here do I need to check for the NULL conditions or is it required to add this code in to try catch block?

推荐答案

简答：否。

看看：我需要在p = new Fred（）之后检查null吗？：

Short answer: no.
Take a look: Do I need to check for null after p = new Fred()?:

在C ++中，如果运行时系统在p = new Fred（）期间无法分配sizeof（Fred）字节的内存，则会抛出std :: bad_alloc异常。 与malloc（）不同，new永远不会返回null！



因此你应该简单地写一下：



Fred * p = new Fred（）; //无需检查p是否为空

In C++, if the runtime system cannot allocate sizeof(Fred) bytes of memory during p = new Fred(), a std::bad_alloc exception will be thrown. Unlike malloc(), new never returns null!

Therefore you should simply write:

Fred * p = new Fred(); // No need to check if p is null

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