[]运算符在std :: map给我分段错误 [英] [] operator in std::map is giving me segmentation fault

问题描述

我有一个

std::map<std::string, myClass*> myMap

然后我插入如下：

if(!myKey.empty())
{
    myMap[myKey] = this;
}

这有时会导致分段错误。

This sometime is throwing a segmentation fault.

为什么

推荐答案

也许您的myMap不再可访问。例如，它可能是对已删除的指针的引用，或者更可能是已删除类的成员变量：

Maybe your myMap is no longer accessible. For instance, it might be a reference to a deleted pointer, or, much more probable, a member variable of an already deleted class:

class MyClass {
  public:
    selfInsert(std::string myKey) {
      if(!myKey.empty()) {
        myMap[myKey] = this;
      }
    }

  private:
    std::map<std::string, myClass*> myMap;
}

int main()
{
  MyClass *a = new MyClass();
  delete a;
  a->selfInsert();
}

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