c/c++语言开发共享functional filter()

 1 #include "pch.h"   2 #include <iostream>   3 #include <deque>   4 #include <string>   5 #include <list>   6 #include <algorithm>   7 #include <vector>   8 #include <functional>   9 using namespace std;  10   11 template<typename inputiterator, typename outputiterator,typename elemtype, typename comp>  12 outputiterator  13 filter(inputiterator first, inputiterator last, 
　　　　　　outputiterator at, const elemtype &val, comp pred)  14 {  15     while((first=find_if(first, last, bind2nd(pred, val)))!=last)  16     {  17         cout << "found value:" << *first << endl;  18         *at++ = *first++;  19     }  20     return at;  21 }  22   23 int main()  24 {  25     const int elem_size = 8;  26     int ia[elem_size] = { 12,8,43,0,6,21,3,7 };  27     vector<int> ivec(ia,ia+elem_size);  28     int ia2[elem_size];  29     vector<int> ivec2(elem_size);  30     cout << "filtering integer array for values less than 8n";  31     filter(ia, ia + elem_size, ia2, elem_size, less<int>());  32     cout << "filtering integer vector for values greater than 8n";  33     filter(ivec.begin(), ivec.end(), ivec2.begin(), elem_size, greater<int>());  34     return 0;  35 }