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
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
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
#include
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;
}