This is a small wrapper around tryCatch() that captures any
condition signalled while evaluating its argument. It is useful for
situations where you expect a specific condition to be signalled,
for debugging, and for unit testing.
Arguments
- expr
Expression to be evaluated with a catching condition handler.
- classes
A character vector of condition classes to catch. By default, catches all conditions.
Examples
catch_cnd(10)
#> NULL
catch_cnd(abort("an error"))
#> <error/rlang_error>
#> Error:
#> ! an error
#> ---
#> Backtrace:
#> 1. pkgdown::build_site_github_pages(new_process = FALSE, install = FALSE)
#> 2. pkgdown::build_site(...)
#> 3. pkgdown:::build_site_local(...)
#> 4. pkgdown::build_reference(...)
#> 5. purrr::map(...)
#> 6. pkgdown .f(.x[[i]], ...)
#> 8. pkgdown:::data_reference_topic(...)
#> 9. pkgdown:::run_examples(...)
#> 10. pkgdown:::highlight_examples(code, topic, env = env)
#> 11. downlit::evaluate_and_highlight(...)
#> 12. evaluate::evaluate(code, child_env(env), new_device = TRUE, output_handler = output_handler)
#> 13. evaluate:::evaluate_call(...)
#> 23. evaluate:::eval_with_user_handlers(expr, envir, enclos, user_handlers)
#> 24. [ base::eval(...) ] with 1 more call
catch_cnd(signal("my_condition", message = "a condition"))
#> <my_condition: a condition>