Re: How to get the type of $null?

Ah, this works:

void ReturnType() {}
template <typename T>
T ReturnType(const T& val) { return val; }

decltype(ReturnType($null))

On Sun, Oct 17, 2021 at 9:15 AM Lindley French <[email protected]> wrote:

> I'd like to retrieve the eventual return type of the function, e.g. the
> thing that determines whether $null maps to 0 or nothing.
>
> I tried decltype($null) but that doesn't work when $null is nothing, e.g.
> decltype() is ill-formed.
>
> I'm trying to call a sub-typemap within a lambda and I need the return
> type of the lambda to work out. I could make it work with just a scope
> block instead of a lambda, but that's not as clean.
>

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