- Let's say I have three packages,
parentPkgI have a call to function
foo()is also a function in
I would like to be able, in
parentPkgto use the
::operator to call
foo()but to programatically switch the package name. Something like:
dummy_pkg_name = ifelse(scenario=="child1", "childPkg1", "childPkg2") dummy_pkg_name::foo()
Is it possible? How do I achieve it?
parentPkg is a function that interacts with a web application, takes some request and data and returns results from different statistical models depending on the scenarios.
Each scenario is quite complex and not everything can be generalised in
parentPkg. For this reason,
childPkg2 (actually there are also 3 and 4) are sort of sub-packages that deals with the data cleaning and various alternatives for each scenario but return the same class of value.
The idea is that
parentPkg would switch the package to the pertinent child depending on the scenario and call all of the necessary functions without having to write the same sequence for each child but just with a slightly different
:: can be seen as a function, it looks like
is what you want. Alternatively,
getFromNamespace("foo", ns = dummy_pkg_name)()
`::`(stats, t.test) # function (x, ...) # UseMethod("t.test") # <bytecode: 0x102fd4b00> # <environment: namespace:stats> getFromNamespace("t.test", ns = "stats") # function (x, ...) # UseMethod("t.test") # <bytecode: 0x102fd4b00> # <environment: namespace:stats>