C++：microsoft Visual Studio中的指针问题

int* ptr = nullptr;
*ptr = 10; // 错误

if (ptr != nullptr) {
    *ptr = 10;
}

int* ptr;
*ptr = 10; // 错误

int* ptr = new int;
*ptr = 10;
delete ptr;
ptr = nullptr;

void leakyFunction() {
    int* ptr = new int[10];
    // 忘记调用 delete[]
}

#include <memory>

void safeFunction() {
    std::unique_ptr<int[]> ptr(new int[10]);
    // 不需要手动释放内存
}

int* ptr = new int;
delete ptr;
// ptr 现在是悬垂指针

int* ptr = new int;
delete ptr;
ptr = nullptr;

#include <iostream>
#include <memory>

int main() {
    // 使用智能指针管理动态内存
    std::unique_ptr<int> smartPtr(new int);
    *smartPtr = 42;
    std::cout << "Value: " << *smartPtr << std::endl;

    // 手动管理内存
    int* rawPtr = new int;
    *rawPtr = 100;
    std::cout << "Value: " << *rawPtr << std::endl;
    delete rawPtr; // 释放内存
    rawPtr = nullptr; // 避免悬垂指针

    return 0;
}