Method copy_from

bolt/expression/ComplexWriterTypes.h:637–656

  // Any map type iterable in tuple like manner.
  template <typename MapType>
  void copy_from(const MapType& data) {
    resize(0);
    // TODO: acceletare this with memcpy.
    for (const auto& [key, value] : data) {
      auto [keyWriter, valueWriter] = add_item();
      // copy key
      if constexpr (provide_std_interface<K>) {
        keyWriter = key;
      } else {
        keyWriter.copy_from(key);
      }

      // copy value
      if constexpr (provide_std_interface<V>) {
        valueWriter = value;
      } else {
        valueWriter.copy_from(value);
      }
    }
  }

  // Copy from nullable mapview.
  void copy_from(