My question is about how to use bitwise operators on C++ `std::string`. Through overloading or as function does not matter.

Example for an working XOR/`^` function for `std::string`:

```
std::string XOR(std::string value, std::string key)
{
  std::string retval(value);
  long unsigned int klen = key.length();
  long unsigned int vlen = value.length();
  unsigned long int k = 0;
  unsigned long int v = 0;
  for (; v < vlen; v++) {
    retval[v] = value[v] ^ key[k];
    k = (++k < klen ? k : 0);
  }
  return retval;
}

```

What I am missing now is a replacement for NOT/`~`, AND/`&` plus OR/`|`.
Example C++ Code (the last two lines would like to have it... :-P):

```
//note: matrix_content[][] holds unsigned, *checked* integers...
//      char(foo) works... 
std::string vertical_master   = "";
for (unsigned short int k = 0; k < axis_max; k++) {
  for (unsigned short int l = 0; l < axis_max; l++) {
    horizontal_master += char(matrix_content[l][k]);
    vertical_master   += char(matrix_content[k][l]);
  }
}

std::string vertical_shift1_0 = vertical_master;
usigned short int bit = "@"; //<- just an example... chatched via
                             //   std::string::substr() and std::string::c_str()
for (unsigned long int x = 0; x < axis_max; x++) {
  vertical_shift1_0 += char(bit);
}
std::string vertical_shift2_0;
for (unsigned long int x = 0; x < axis_max; x++) {
  vertical_shift2_0 += char(0);
}
vertical_shift2_0 += vertical_master;

std::string vertical_or  = ~(vertical_shift1 | vertical_shift2);
std::string vertical_and = ~(vertical_shift1_0 & vertical_shift2_0);

```

In PHP/Perl I can do nasty :-P things like this

```
$vertical_shift1_0 = $vertical_master.str_repeat(chr(0), $axis_max);
$vertical_shift2_0 = str_repeat(chr(0), $axis_max).$vertical_master;
$vertical_or       = chunk_split(~($vertical_shift1 | $vertical_shift2), $axis_max, chr(170));
$vertical_and      = chunk_split(~($vertical_shift1_0 & $vertical_shift2_0), $axis_max, chr(170));

```

... and I'm missing it ;-). However XOR works. How can I get AND/OR/NOT?