debugcall
Debug a Call
Set or unset debugging flags based on a call to a function. Takes into account S3/S4 method dispatch based on the classes of the arguments in the call.
- Keywords
- utilities, programming, environment
Usage
debugcall(call, once = FALSE)
undebugcall(call)Arguments
- call
An R expression calling a function. The called function will be debugged. See Details.
- once
logical; if
TRUE, debugging only occurs once, as viadebugonce. Defaults toFALSE
Details
debugcall debugs the non-generic function, S3 method or S4
method that would be called by evaluating call. Thus, the user
does not need to specify the signature when debugging
methods. Although the call is actually to the generic, it is the
method that is debugged, not the generic, except for non-standard S3
generics (see isS3stdGeneric).
Value
debugcall invisibly returns the debugged call expression.
Note
Non-standard evaluation is used to retrieve the call (via
substitute). For this reason, passing a variable
containing a call expression, rather than the call expression itself,
will not work.
See Also
debug for the primary debugging interface
Examples
library(utils)
# NOT RUN {
## Evaluate call after setting debugging
##
f <- factor(1:10)
res <- eval(debugcall(summary(f)))
# }