swap函数的一些扩展（数据结构）
#include <iostream>
using namespace std;
struct A{
int a;
int b;
}A1={0};
struct A my_swap(int a1,int b1)
{
A1.a=b1;
A1.b=a1;
return A1;
}
int main()
{
int a=1,b=2;
A A2= my_swap(a,b);
my_swap(a,b);
printf("%d %d",a,b);
return 0;
}
用结构体实现了swap
其实最简单的还是用指针来写swap
my_swap(int &a,int &b) my_swap(int *a,int *b) /× 两种写法等价
然而直接用
my_swap(int a,int b); 是不能交换函数值的
因为虽然在这个函数虽然在这个函数内部互换了函数值，但是这仅仅局限与函数内部，对于整个main函数的调用并没有使用返回值。
我在想如果用内联函数进行展开是不是可以交换呢。读者们可以亲自试试。 inline int swap(int a,int b);
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