Invoke interrupt from R code

Question

I have a generic function to catch all exceptions included in my package logR::tryCatch2 defined as:

tryCatch2 <- function(expr){
    V=E=W=M=I=         


        

Answer 1

Late answer but I have found that rlang::interrupt can throw "user interrupts":

interrupt() allows R code to simulate a user interrupt of the kind that is signalled with Ctrl-C. It is currently not possible to create custom interrupt condition objects.

Source: ?rlang::interrupt

Internally it calls the R API function Rf_onintr which is an alias for the function onintr.

Basically an interrupt is "just" a special condition with these classes: interrupt and condition (see the R source code).

If you just want to simulate an interrupt to test tryCatching (without the need to interrupt a running R statement) it suffice to throw a condition with these classes via signalCondition:

interrupt_condition <- function() {
  structure(list(), class = c("interrupt", "condition"))
}

tryCatch(signalCondition(interrupt_condition()),
                         interrupt = function(x) print("interrupt detected"))
# [1] "interrupt detected"