Have a look at the Call Traits library, in particular "param_type". Alex 2008/7/4 Michael Marcin <mike.marcin@gmail.com>:
In general noone would write a function that took an int by const reference because doing so doesn't make sense from a performance standpoint. However often times we pass these trivial types to functions generically written to take const T&.
It seems like type traits would make it simple to overload based on this convention. However I don't see a type trait that is fit for this use case.
The has_trivial_copy trait would seem promising but it could return true for large pod objects that you wouldn't want to copy.
The is_scalar trait seems promising but it will return false for lightweight user defined types and be suboptimal.
Using has_trivial_copy together with some sizeof limit seems promising but a bit hand wavy.
Is there a trait designed for this use case I'm overlooking?
Thanks,
Michael Marcin
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