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A cache function to cache arbitrary R code #40

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A cache function to cache arbitrary R code #40

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A cache function to cache arbitrary R code
jimhester Apr 24, 2017
2198a67
Simplify call
jimhester Apr 26, 2017
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1 change: 1 addition & 0 deletions NAMESPACE
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
# Generated by roxygen2: do not edit by hand

S3method(print,memoised)
export(cache)
export(cache_filesystem)
export(cache_memory)
export(cache_s3)
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18 changes: 18 additions & 0 deletions R/cache.R
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@@ -0,0 +1,18 @@
#' @export
cache <- function(code, ..., envir = parent.frame(), cache = cache_memory()) {
expr <- substitute(code)
key <- cache$digest(c(expr, lapply(list(...), function(x) eval(x[[2L]], environment(x)))))
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@hadley hadley Apr 26, 2017

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Is the eval necessary here? Won't list(...) force all the promises?

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@hadley hadley Apr 26, 2017

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Oh because they're formulas

if (cache$has_key(key)) {
res <- cache$get(key)
if (res$visible) {
res$value
} else {
invisible(res$value)
}
} else {
f <- function() NULL
body(f) <- expr
environment(f) <- envir
cache$set(key, f())
}
}