Re: [Boost-users] [Units] Variant based runtime analysis

Subject: Re: [Boost-users] [Units] Variant based runtime analysis
From: Samuel Debionne (debionne_at_[hidden])
Date: 2011-02-28 05:06:36

>> I have been playing with things like :
>>
>> quantity<variant<force, length, energy>  >
>
> That won't work because variant<...>  is not a unit type. Can you post
> a small example of what you want to achieve?

Of course it won't work as is. But I did a bit of hacking in this direction.

My aim is to be able to write something like this :

any_quantity<force, length, energy> any_q = myfunction(...);

...

quantity<force> = any_q; //runtime check

Is there any plan to have a runtime layer above Boost.Units (like boost 
GIL have dynamic any_images, any_view...) ?

It would check the maximum at compile time (basically check if one the 
variant type could match the target quantity unit) and delegates the 
real check at runtime (throwing an exception if the conversion fails) ?

IMHO it would be a lovely addition to the current library.