std::minmax_element的简单用法

获取一个数组中的最大值和最小值，通过匿名函数声明自定义比较策略。

#include <iostream>
#include <vector>
#include <algorithm>
#include <string>

#define BUFSIZE 6
using namespace std;

typedef struct
{
    std::string name;
    int distance;
}vi;

int main()
{
    //create dataset
    vi vi_data;
    std::vector<vi> vi_vector;
    std::array<std::string,BUFSIZE> names = {"a","b","c","d","e","f"};
    std::array<int,BUFSIZE> distances= {4,8,2,90,54,23};
    for(int i = 0; i < BUFSIZE; i++){
        vi_data.name = names[i];
        vi_data.distance = distances[i];
        vi_vector.push_back(vi_data);
    }

    //get min and max vi through compare vi.distance
    std::pair<std::vector<vi>::iterator,std::vector<vi>::iterator> minmax; //auto
    minmax = std::minmax_element(vi_vector.begin(),vi_vector.end(),
                                      [](const vi &m1, const vi &m2){
        return m1.distance < m2.distance;
    });
    std::cout << "min distance = " << minmax.first->distance<<endl;
    std::cout << "max distance = " << minmax.second->distance<<endl;
    exit(0);
}