countif http://www.cplusplus.com/reference/algorithm/count_if/
// count_if example
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
bool IsOdd (int i) { return ((i%2)==1); }
int main () {
int mycount;
vector<int> myvector;
for (int i=1; i<10; i++) myvector.push_back(i); // myvector: 1 2 3 4 5 6 7 8 9
mycount = (int) count_if (myvector.begin(), myvector.end(), IsOdd);
cout << "myvector contains " << mycount << " odd values.\n";
return 0;
}
posted on 2011-07-29 22:40 more think, more gains 阅读(152) 评论(0) 编辑 收藏 举报