Function construct_or_initialize

include/pybind11/detail/init.h:76–78

          typename... Args,
          detail::enable_if_t<std::is_constructible<Class, Args...>::value, int> = 0>
inline Class *construct_or_initialize(Args &&...args) {
    return new Class(std::forward<Args>(args)...);
}
template <typename Class,
          typename... Args,
          detail::enable_if_t<!std::is_constructible<Class, Args...>::value, int> = 0>