gistfile1.cpp

struct type {
  std::size_t size;
  std::size_t alignment;
  std::unordered_map<std::string, field> fields;
  std::function<void(void*, void*)> move;
};

struct field {
  std::size_t size;
  std::size_t offset;

  template<typename T>
  T read(void* objptr) {
    static_assert(std::is_pod<T>());
    assert(sizeof(T) == size);
    T result;
    memcpy(&result, (char*)objptr + offset, size);
    return result;
  }

  template<typename T>
  void write(void* objptr, T value) {
    static_assert(std::is_pod<T>());
    assert(sizeof(T) == size);
    memcpy((char*)objptr + offset, &value, size);
  }
};