Harry, Impersonators are used to implement some of the contracts, especially higher order contracts for mutable values such as box/c and vector/c. They "impersonate" a box or vector by intercepting -ref and -set! operations and wrapping the contained value in a contract after getting it / before setting it.
Carl Eastlund On Thu, Jan 19, 2012 at 4:19 PM, Harry Spier <vasishtha.sp...@gmail.com>wrote: > Dear list members, > > In the Racket reference under "reflection and security" they give the > functionality of "impersonators". As far as I can see there is no mention > in the Guide. I can see what they do, but I'm unclear what they are used > for. Could someone give me a relatively simple example of where and what > they would be used for. > > Many thanks, > Harry Spier >
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