为什么访问这个空指针不会引发异常？

Question

#include <iostream>

class TestClass {
public:
    TestClass() {
        std::cout << "TestClass instantiated\n";
    }

    ~TestClass() {
        std::cout << "TestClass destructed\n";
    }

    void PrintSomething() {
        std::cout << "TestClass is printing something\n";
    }
};

int main() {
    
    TestClass* tClass = new TestClass();
    delete tClass;
    tClass = nullptr;
    tClass->PrintSomething();

    std::cout << "Exiting...\n";
    return 0;
}

结果：

TestClass instantiated
TestClass destructed
TestClass is printing something
Exiting...

我认为在 tClass 指针设置为 nullptr 后尝试打印某些内容会导致空指针异常错误，但它打印得很好。

Answer 1

Why doesn't accessing this nullpointer cause an exception?

因为没有指定引发异常。通过空指针访问会导致未定义的行为。别这样。

为什么访问这个空指针不会引发异常？

Why doesn't accessing this nullpointer cause an exception?

c++

pointers