Does the standard guarantee that the elements of string be contiguous in
memory after calling the method string::c_str() or string::data() ?
If not, I think it should.
This will very useful when I want to pass string as nonconst char* into
C-style function, for example,
to read data from a file descriptor in unix,

   string str; str.resize(20); str.data();
   read(fd, &str[0], str.length());

that will be more efficient than,

   string str; vector<char> buf(20);
   read(fd, &buf[0], buf.length());
   str.assign(&buf[0], buf.length());

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