C++中min_element()與max_element()(取容器中的最大最小值)
阿新 • • 發佈:2018-12-10
min_element 和 max_element
標頭檔案:#include<algorithm>
作用:返回容器中最小值和最大值的指標。max_element(first,end,cmp);其中cmp為可選擇引數!
例1
#include<iostream> #include<algorithm> using namespace std; bool cmp(int a,int b) { return a<b; } int main() { int num[]={2,3,1,6,4,5}; cout<<"最小值是 "<<*min_element(num,num+6)<<endl; cout<<"最大值是 "<<*max_element(num,num+6)<<endl; cout<<"最小值是 "<<*min_element(num,num+6,cmp)<<endl; cout<<"最大值是 "<<*max_element(num,num+6,cmp)<<endl; return 0; }
例2
vector<cv::DMatch> matches; cv::BFMatcher matcher ( cv::NORM_HAMMING ); matcher.match ( descriptors_ref_, descriptors_curr_, matches ); // select the best matches float min_dis = std::min_element ( matches.begin(), matches.end(), [] ( const cv::DMatch& m1, const cv::DMatch& m2 ) { return m1.distance < m2.distance; } )->distance;