Value or Reference Semantics Trait

[qznc]

On Sunday, 12 January 2014 at 20:16:15 UTC, Nordlöw wrote:
> Is there a trait to check whether a type has value or reference 
> semantics?
>
> I need this in a template struct that adaptively (using static 
> if) represent histogram bins as either a dense static array or 
> a sparse associative array.

No, afaik.

However, the question goes deeper than you might have though. You 
probably want to distuingish between structs+scalars vs classes. 
However, what about ref-arguments? Mutable arrays are struct 
values, but have reference semantics. Immutable-value arrays 
(e.g. string) have value semantics.

You could use one version as default and define special cases via 
some stuff you find in std.traits.