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const_reference operator[](size_type pos) const;
reference operator[](size_type pos);

string bs("01234567");
size_t i = f();

bs[i] = '\0';

string bs("01234567");
try {
  size_t i = f();
  bs.at(i) = '\0';
}
catch (...) {
  cerr << "Index out of range" << endl;
}

string bs("01234567");
for (int i=0; i < 100; i++) {
  bs[i] = '\0';
}

size_t const max_fill = 100;
std::string bs("01234567");

fill(bs.begin(), bs.begin()+std::min(max_fill, bs.length()), '\0' );