函数指针

#include<iostream>
#include<vector>
using namespace std;
void add(int a, int b) {
    cout<<a + b<<" ";
}
void ForEach(const vector<int>& nums,void (*add)(int a,int b)){
    for (int i = 0; i < nums.size() - 1; i++) {
        add(nums[i], nums[i + 1]);
    }
}

int main()
{
    vector<int> nums{ 2,4,5,6,7,8 };
    auto function = add;//这里auto的类型是void(*)(int,int)
    void(*lee)(int, int) = add;//这里的lee就代表名字，可以用lee替换add 
    typedef void(*AddFunction)(int,int);//此处AddFunction就是这种函数指针类型的别名
    AddFunction addfunction = add;
    ForEach(nums, lee);
    ForEach(nums, function);
    ForEach(nums, add);
    ForEach(nums, addfunction );  
}