These functions are not designed to be used directly, we advise to use the
syntaxes described in ?declare instead. check_arg checks that arguments
satisfy an assertion, and if relevant make them into active bindings to make sure they
always satisy it. check_output checks that the value, presumably a return
value, satisfies an assertion,
Usage
check_output(.output, .assertion, ...)
check_arg(.arg, .assertion, ..., .bind = FALSE)
Arguments
- .output
function output
- .assertion
an assertion
- ...
additional arguments passed to assertion
- .arg
function argument
- .bind
whether to actively bind the argument so it cannot be modified
unless it satisfies the assertion
Value
.outputif it satisfies the assertion, fails otherwise.
returns NULL invisibly, called for side effects.
