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digitalmars.D.learn - UDAs in Place of alias.thised Wrapper Structs

Are the pros to using

- UDAs

instead of

- wrapper structs
- alias this

to provide extra semantic information like units of measurement 
in terms of compilation speed memory usage and expressivity

I'm asking because I'm planning on converting my


to UDAs instead of wrapper structs.

On this that comes to my mind is that composability might become 
easier right?

See also: https://en.wikipedia.org/wiki/Units_of_measurement
Sep 11 2014