如何检查std :: vector超出范围访问权限

[Found a doublicate here: C++ - detect out-of-range access ]

[在这里发现一个问题:C ++ - 检测超出范围的访问]

If I have a programm with "out of range vector access", like this:

如果我有一个“超出范围矢量访问”的程序,像这样:

  std::vector<int> A(2);
  ...
  A[10] = 3;

Do I have a way to find this error for sure? I mean something like compile in debug mode and see whether some assertion stops the execution.

我有办法确定找到这个错误吗?我的意思是在调试模式下编译,看看某些断言是否会停止执行。

Up to now I have checked it by my own. But may be I don't have to write additional code?

到目前为止,我已经自己查了一下。但可能是我不必编写额外的代码?

P.S. I checked assertion of course. It doesn't called.

附:我当然检查过断言。它没有打电话。

With this program:

有了这个程序:

#include <vector>

int main() {
  std::vector<int> A(2);
  A[10] = 3;
  return 0;
}

compiled by

g++ 1.cpp -O0; ./a.out

So it looks like std doesn't have assertion in the code, I can't stop wonder why they don't make such a simple check.

所以看起来std在代码中没有断言,我不禁想知道为什么他们不做这么简单的检查。

2 个解决方案

#1

Use at() member function:

在()成员函数使用:

std::vector<int> A(2);

A.at(10) = 3;  //will throw std::out_of_range exception!

Since it may throw exception, you would like to catch it. So use try{} catch{} block!

因为它可能会抛出异常,所以你想抓住它。所以使用try {} catch {}块!

Hope that helps.

希望有所帮助。

#2

Do I have a way to find this error for sure? I mean something like compile in debug mode and see whether some assertion stops the execution.

我有办法确定找到这个错误吗?我的意思是在调试模式下编译,看看某些断言是否会停止执行。

Valgrind easily catches these errors. Just run:

Valgrind很容易发现这些错误。赶紧跑:

valgrind ./YOUR_EXECUTABLE

I can't stop wonder why they don't make such a simple check.

我不禁想知道为什么他们不做这么简单的检查。

See this answer.

看到这个答案。

#1