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copy函数与ostream_iterator、reverse_iterator

#include <iostream>#include <iterator>#include <vector>int main(){    using namespace std;    int casts[10]={6,7,2,9,4,11,8,7,10,5};    vector<int> dice(10);    copy(casts,casts+10,dice.begin());    cout << "Let the dice be cast!\n";    ostream_iterator<int,char> out_iter(cout," ");    copy(dice.begin(),dice.end(),out_iter);    cout << endl;    cout << "Implicit use of reverse iterator.\n";    copy(dice.rbegin(),dice.rend(),out_iter);    cout << endl;    cout << "Explicit use fo reverse iterator.\n";    vector<int>::reverse_iterator ri;    for(ri=dice.rbegin();ri!=dice.rend();ri++)        cout << *ri <<  ;    cout << endl;    return 0;}