reference binding to null pointer of type 'std::vector<int, std::allocator<int>>' (stl_vector.h)中文回答

这个错误提示表示你在使用一个指向空指针的引用，而这个引用的类型是std::vector<int, std::allocator<int>>。这可能是因为你在某个地方尝试使用一个已经被释放的vector对象的引用，或者你忘记给vector对象分配内存，导致vector对象的指针为空。要解决这个问题，你需要检查你的代码，确保每个vector对象都被正确地初始化和分配内存。

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reference binding to null pointer of type 'std::vector<int, std::allocator<int>>' (stl_vector.h)

This error occurs when you try to reference a null pointer of type 'std::vector<int, std::allocator<int>>'. It means that you have a vector object that has not been properly initialized or has been deleted, and you are trying to access its elements.

To fix this error, you need to make sure that the vector object is properly initialized and not deleted before you access its elements. You can also check if the pointer is null before accessing its elements to avoid this error.

For example, the following code will result in the error:

std::vector<int> *v = nullptr;
int x = (*v)[0]; // error: reference binding to null pointer of type 'std::vector<int, std::allocator<int>>'

To fix this error, you need to initialize the vector object before accessing its elements:

std::vector<int> v = {1, 2, 3};
int x = v[0]; // no error

Or check if the pointer is null before accessing the elements:

std::vector<int> *v = nullptr;
if (v != nullptr) {
    int x = (*v)[0]; // no error
}

Char 9: runtime error: reference binding to null pointer of type 'std::vector<int, std::allocator<int>>' (stl_vector.h) SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_vector.h:1043:9

这个错误发生在试图将一个空指针赋值给vector的引用或指针时。原因可能是你没有正确地初始化vector或者在使用vector之前已经将其销毁了。以下是可能的解决方案：

- 确保在使用vector之前对其进行了正确的初始化，例如使用vector的构造函数或push_back方法添加元素。
- 检查你的代码是否错误地将vector销毁了，例如在其它函数中删除了vector或使用了已经销毁的vector。
- 如果你使用了指针，确保指针不为空，且指向了有效的vector对象。
- 考虑使用智能指针等RAII机制来管理vector的生命周期，以避免手动管理引起的错误。