Method take_prefix

lib/swoc/include/swoc/TextView.h:1349–1355

}

inline TextView
TextView::take_prefix(size_t n) {
  n              = std::min(n, this->size());
  self_type zret = this->prefix(n);
  this->remove_prefix(std::min(n + 1, this->size()));
  return zret;
}

inline TextView
TextView::take_prefix_at(char c) {