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How to restrict the variable's data type of procedure with @key

Hi,

I want to define a procedure that with @key, and I also want to restrict the variable's datatype, I tried with folloing but I received error in CIW

procedure(tt(handler @key str1 str2 "ssS")
printf("handler: %L\n" handler)
)

tt('test)

The error is like: *Error* tt: argument for keyword ?str1 should be a symbol (type template = "ssS") at line 11 of file

Thanks,

James

Andrew Beckett 9 months ago

James,

Since you are not passing either of the keyword arguments, their default value is nil, which doesn’t match the type template. You’d have to ensure that the default value is a string or a symbol - e.g. @key (str1 ‘none) or something like that. Or give the type template as “g” and add an explicit check for the value either being nil or symbolp(str1) within the code.

Andrew
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JamesJames 9 months ago in reply to Andrew Beckett

Thanks Andrew, I get it.

James
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