With updates to magrittr to version 2.0, this Cache pipe is now broken.
We are working on an update.
This pipe can only be used at any point in a pipe chain, but must
be preceded by Cache(...) (which allows other Cache() \%C\% ... remaining pipes
arguments to be passed).
This will take the input arguments of the first function immediately following
the Cache() and the pipe chain until the special \%C\%,
evaluate them both against the cachePath argument in Cache.
If they exist, then the entire pipe chain will be skipped, and only the
previous final result will be given.
If there is no previous cached copy of the initial function's arguments,
then all chain elements will be evaluated.
The final result will be cached for future use.
Therefore, the entire chain must be identical.
The required usage should be straight forward to insert into existing code
that uses pipes (Cache() \%C\% ... remaining pipes).
Still experimental and may change. This form cannot pass any arguments to
Cache, such as cachePath, thus it is of limited utility. However,
it is a clean alternative for simple cases.
lhs %C% rhs
lhs %<% rhsArguments
- lhs
A name to assign to.
- rhs
A function call