很久之前学的C++了,复习一下,指针是一个存放地址的变量,而指针引用指的是这个变量的引用,众所周知C++中如果参数不是引用的话会调用参数对象的拷贝构造函数,所以如果有需求想改变指针所指的对象(换句话说,就是要改变指针里面存的地址),就要使用指针引用,在网上看到大佬的代码,简单明了,如下
#include <iostream> using namespace std; struct point { int x; int y; }; void changenum1(point *&pnum) { pnum = new point; pnum->x = 4; } void changenum2(point *pnum) { pnum = new point; pnum->x = 4; } void test1() { point *num = new point; num->x = 10; changenum1(num); std::cout << "指针引用" << num->x << endl; } void test2() { point *num = new point; num->x = 10; changenum2(num); std::cout << "指针" << num->x << endl; } int main() { cout << "开始执行程序" << endl; test1(); test2(); cout << "执行程序完毕" << endl; return 0; }
输出结果:
D:Workspaceclion-workspacestar-referenceVSstarcmake-build-debugstar_referenceVSstar.exe 开始执行程序 指针引用4 指针10 执行程序完毕 Process finished with exit code 0