在以下代码里，除了最后赋值给成员变量，中间所有步骤都无须拷贝
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class Person {
public:
  bool SetName(string_view name) {
    if (name.empty()) {
      return false;
    }
    auto [first_name, last_name] = GetFirstLastName(name);
    if (!ValidateFirstName(first_name) || !ValidateLastName(last_name)) {
      return false;
    }
    first_name_ = first_name;
    last_name_ = last_name;
    return true;
  }

private:
  // Return value is only valid if the input string is still in lifetime.
  pair<string_view, string_view> GetFirstLastName(string_view name) {
    int i = 0;
    while (i < name.size() && name[i] != ' ') {
      ++i;
    }
    string_view first_name = name.substr(0, i);
    string_view last_name = name.substr(i);
    return {first_name, last_name};
  }

  bool ValidateFirstName(string_view) {
    // TODO: add real validation logic.
    return true;
  }

  bool ValidateLastName(string_view) {
    // TODO: add real validation logic.
    return true;
  }
  
  string first_name_;
  string last_name_;
};

int main() {
  Person p;
  p.SetName("James Bond");
  
  string request = "AGENT:James Bond"; // suppose this data is coming from outside source.
  constexpr string_view agent = "AGENT:";
  string_view r = request;
  CHECK(r.starts_with(agent));
  r.remove_prefix(agent.size());
  p.SetName(r);

  return 0;
}
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修改:here080 FROM 76.126.252.*
FROM 76.126.252.*