c++从入门到精通——const分配内存模型

const分配内存模型

对const变量取地址，分配临时内存

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
using namespace std;
void test() {
  const int a = 10;
  int *p = (int *)(&a);
  cout << "p=" << p << endl;
  cout << "a=" << &a << endl;
  cout << "p_address=" << &p << endl;
}

int main() {
  test();
  return EXIT_SUCCESS;
}

使用普通变量 初始化 const变量

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
using namespace std;
void test() {
  int a = 10;
  const int b = a;
  int *p = (int *)&b;
  *p = 1000;
  cout << " b = " << b << endl;
}

int main() {
  test();
  return EXIT_SUCCESS;
}

对于自定义数据类型

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<string>
using namespace std;

struct Person {
  string m_Name;
  int m_Age;
};

//对于自定义数据类型
void test() {
  const Person p;
  //  p.m_Age = 10;
  Person *pp = (Person *)&p;
  (*pp).m_Name = "Tom";
  pp->m_Age = 10;
  cout << "姓名： " << p.m_Name << " 年龄： " << p.m_Age << endl;
}

int main() {
  test();
  return EXIT_SUCCESS;
}