Version 1.1.0

• Caches now hash the function body along with the arguments, to ensure functions with identical arguments use a separate file-system cache. (#38)
• Handle missing arguments in memoised functions for simple cases not using non-standard-evaluation (#19).
• memoise() gains a cache= argument to specify an external cache. Two types of caches are available, cache_s3() for amazon S3 and cache_filesystem() for a file system cache (#25, @danielecook).

Version 1.0.0

• memoise() now signals an error if an already memoised function is used as input (#4, @richierocks).
• has_cache() function added which returns a boolean depending on if the given call is cached or not (#10, @dkesh).
• Memoised functions now have a print method which displays the original function definition, rather than the memoisation code (#15, @jimhester).
• A memoised function now has the same interface as the original function, if the original function is known when memoise is called. (Otherwise, the old behavior is invoked, with a warning.) (#14, @krlmlr)
• The enclosing environment of the memoised function is specified explicitly, defaults to parent.frame().
• is.memoised now checks if the argument is a function.
• Testing infrastructure, full test coverage.

Version 0.2.1

• Update to fix outstanding R CMD check issues.

Version 0.2 (2010-11-11)

New features

• Memoised functions now have an attribute memoised=TRUE, and is.memoised() tests whether a function is memoised. (Contributed by Sietse Brouwer.)

Improvements

• Documentation is now more elaborate, and hopefully more accessible to newcomers. Thanks to Sietse Brouwer for the verbosity.