> On 21 Jun 2018, at 00:30, nine.fierce.ball...@gmail.com wrote:
> Maybe a function would help:
>
> Transform make_transform(const Transform *t)
> {
> return t ? Transform (*t) : Transform ();
> }
>
> You could also do it as a constructor, if you prefer its syntax and
> don't mind implementing yet another one:
>
> explicit Transform(const Transform *t) ...
One can also use a tag type argument in the constructor:
struct make_t {};
constexpr make_t make{};
Used in the C++ library, cf.
https://en.cppreference.com/w/cpp/utility/optional/nullopt_t
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