Method validate

third-part/jsoncpp/src/lib_json/json_writer.cpp:1185–1201

  valid_keys->insert("precision");
}
bool StreamWriterBuilder::validate(Json::Value* invalid) const
{
  Json::Value my_invalid;
  if (!invalid) invalid = &my_invalid;  // so we do not need to test for NULL
  Json::Value& inv = *invalid;
  std::set<JSONCPP_STRING> valid_keys;
  getValidWriterKeys(&valid_keys);
  Value::Members keys = settings_.getMemberNames();
  size_t n = keys.size();
  for (size_t i = 0; i < n; ++i) {
    JSONCPP_STRING const& key = keys[i];
    if (valid_keys.find(key) == valid_keys.end()) {
      inv[key] = settings_[key];
    }
  }
  return 0u == inv.size();
}
Value& StreamWriterBuilder::operator[](JSONCPP_STRING key)
{
  return settings_[key];