print string with iostream cout

print_string_iostream.cpp

void print(std::string const& buf) {
| 63     for (std::string::const_iterator it = buf.begin(), end = buf.end();
| 64          it != end;
- 65          ++it) {
2 66         std::cout
2 67             << std::setw(2)
2 68             << std::hex
2 69             << std::setfill('0')
2 70             << (static_cast<int>(*it) & 0xff)
2 71             << ' ';
2 72     }
| 73     std::cout << std::dec << std::endl;
| 74 }