如何轻松地将无符号字符串转换为字符串？

Question

I define an unsigned string as a string containing unsigned chars:

namespace std
{
   typedef basic_string<unsigned char> ustring;
}

Thus, given a basic std::string whose chars range from -128 to 127, how can I easily convert it to a std::ustring whose chars range from 0 to 255?

Answer 1

You do:

using ustring = std::vector<unsigned char>;
std::string a("abc");
ustring b(a.begin(), a.end()); 

Note that the zero-terminator is not copied.

---

basic_string<unsigned char> would require specializing char_traits . And no new names can be added to namespace std .

Answer 2

You may use the iterator constructor:

ustring to_ustring(const std::string& s)
{
    return {s.begin(), s.end()};
}