improve docs+error about anon funcs in a package

Author: t-kalinowski

R/quick.R

@@ -3,7 +3,10 @@
 #' Compile an R function.
 #'
 #' @param fun An R function
-#' @param name Optional string, name to use for the function.
+#' @param name String, name to use for the function. This is optional in
+#'   regular usage but required in an R package. As a convenience, arguments
+#'   `fun` and `name` can also be supplied as positional arguments to `quick` with
+#'   `name` in the first position.
 #'
 #' @details
 #'
@@ -12,8 +15,9 @@
 #' The shape and mode of all function arguments must be declared. Local and
 #' return variables may optionally also be declared.
 #'
-#' `declare(type())` also has support for declaring size constraints, or size
-#' relationships between variables. Here are some examples of declare calls:
+#' `declare(type())` also has support for declaring size constraints, or
+#' size relationships between variables. Here are some examples of declare
+#' calls:
 #'
 #' ```r
 #' declare(type(x = double(NA))) # x is a 1-d double vector of any length
@@ -64,11 +68,11 @@
 #'
 #' ## Return values
 #'
-#' The shape and type of a function return value must be known at compile time.
-#' In most situations, this will be automatically inferred by `quick()`. However,
-#' if the output is dynamic, then you may need to provide a hint.
-#' For example, returning the result of `seq()` will fail because the output shape
-#' cannot be inferred.
+#' The shape and type of a function return value must be known at compile
+#' time. In most situations, this will be automatically inferred by
+#' `quick()`. However, if the output is dynamic, then you may need to
+#' provide a hint. For example, returning the result of `seq()` will fail
+#' because the output shape cannot be inferred.
 #'
 #' ```r
 #' # Will fail to compile:
@@ -82,8 +86,8 @@
 #' })
 #' ```
 #'
-#' However, if the output size can be declared as a dynamic expression using other
-#' values known at runtime, compilation will succeed:
+#' However, if the output size can be declared as a dynamic expression using
+#' other values known at runtime, compilation will succeed:
 #'
 #' ```r
 #' # Succeeds:
@@ -145,6 +149,12 @@ quick <- function(fun, name = NULL) {
 
   pkgname <- parent.pkg()
   if (!is.null(pkgname) && pkgname != "quickr") {
+    if (startsWith(name, 'anonymous_quick_function_')) {
+      stop(
+        'When used in an R package, you must provide a unique `name` to every `quick()` call.\n',
+        'For example: `my_fun <- quick("my_fun", function(x) ....)'
+      )
+    }
     # we are in a package - but outside a quickr::compile_package() call.
     return(create_quick_closure(name, fun))
   }

README.Rmd

@@ -364,6 +364,12 @@ plot(timings) + bench::scale_x_bench_time(base = NULL)
 When called in a package, `quick()` will pre-compile the quick functions and place them in the `./src` directory.
 Run `devtools::load_all()` or `quickr::compile_package()` to ensure that the generated files in `./src` and `./R` are in sync with each other.
 
+In a package, you must provide a function name to `quick()`. For example:
+
+```r
+my_fun <- quick(name = "my_fun", function(x) ....)
+```
+
 ## Installation
 
 You can install quickr from CRAN with: