ContextManager: Context managers
Description
Context managers
Usage
ContextManager(enter = function() { }, exit = function() { },
error = NULL, as = NULL)Arguments
enter
function to run before doing things
exit
function to run after doing things
error
optional function to run if an error is thrown
as
character optional way to specify a default name for assinging
the return of the enter function.
Value
an S3 class "contextManager" object