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[comment {-*- mode: tcl ; fill-column: 90 -*-}]
A function taking neither arguments nor returning results is not very useful.
[list_begin enumerated]
[enum] We are now extending the command to take an argument.
[enum][vset base][example {
critcl::cproc hello {double x} void {
/* double x; */
printf("hello world, we have %f\n", x);
}
}][vset rebuild]
[enum] When testing the package again, entering the simple [cmd hello] will fail.
[para] The changed command is now expecting an argument, and we gave it none.
[para] Retry by entering [example {hello 5}] instead.
Now the command behaves as expected and prints the provided value.
[para] Further try and enter [example {hello world}]
This will fail again.
The command expected a real number and we gave it something decidedly not so.
[para] These checks (argument count, argument type) are implemented in the translation
layer [vset critcl] generates for the C function. The function body is never invoked.
[list_end]
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