029 简单的Filter

#include <iostream>
#include <string>
using namespace std;

// 在此处补充你的代码
template<class T,class F>
T Filter(T ar,T arEnd, T resAr, F fun) {
    for (ar;ar != arEnd;++ar) {
        if (fun(*ar)) {
            *resAr = *ar; 
            resAr++;
        }
    }
    return resAr;
}


bool LargerThan2(int n)
{
    return n > 2;
}
bool LongerThan3(string s)
{
    return s.length() > 3;
}

string as1[5] = { "Tom","Mike","Jack","Ted","Lucy" };
string as2[5];
int  a1[5] = { 1,2,3,4,5 };
int a2[5];
int main() {
    string* p = Filter(as1, as1 + 5, as2, LongerThan3);
    for (int i = 0;i < p - as2; ++i)
        cout << as2[i];
    cout << endl;
    int* p2 = Filter(a1, a1 + 5, a2, LargerThan2);
    for (int i = 0;i < p2 - a2; ++i)
        cout << a2[i] << ",";
    return 0;
}