C++ STL Iterator Adapter

1. std::back_insert_iterator 使用

// back_insert_iterator example
#include <iostream>     // std::cout
#include <iterator>     // std::back_insert_iterator
#include <vector>       // std::vector
#include <algorithm>    // std::copyint main() {std::vector<int> foo, bar;for (int i = 1; i <= 5; i++){foo.push_back(i); bar.push_back(i * 10);}std::back_insert_iterator< std::vector<int> > back_it(foo);std::copy(bar.begin(), bar.end(), back_it);std::cout << "foo:";for (std::vector<int>::iterator it = foo.begin(); it != foo.end(); ++it)std::cout << ' ' << *it;std::cout << '\n';return 0;
}

2. std::front_insert_iterator 使用

// front_insert_iterator example
#include <iostream>     // std::cout
#include <iterator>     // std::front_inser