Hadley Wickham wrote:
Hi all,
I'm trying to understand how the search path and namespaces interact.
For example, take the devtools package which suggests the testthat
package. Here's what the search path looks like after I load each of
those packages:
Luke Tierney wrote up a nice description of this a few years ago. It's
either on developer.r-project.org, or in an old issue of R News.
Duncan Murdoch
library(devtools)
search()
[1] ".GlobalEnv" "package:devtools" "package:stats"
[4] "package:graphics" "package:grDevices" "package:utils"
[7] "package:datasets" "package:methods" "Autoloads"
[10] "package:base"
library(testthat)
search()
[1] ".GlobalEnv" "package:testthat" "package:devtools"
[4] "package:stats" "package:graphics" "package:grDevices"
[7] "package:utils" "package:datasets" "package:methods"
[10] "Autoloads" "package:base"
My question is this: when I execute the test function in devtools
function it calls the the test_package function in the testthat
package - but that function is located higher up the search path - how
does R find it?
(I ask this question because I'm trying to simulate package loading
from within R to simplify the development cycle, but something is
missing in my knowledge of namespaces, and so I have the devel
versions of my packages can't access packages that are loaded after
they are)
Hadley
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