Re: classic asp byRef vs. byBal by Bob
Bob
Thu Oct 20 10:18:12 CDT 2005
JT wrote:
> what is the default behavior of asp for passing values to a function,
> byRef or byVal? i was under the assumption that if you do not
> specify, then it defaults to passing the parameter byRef.
>
> so for example, the following function is accepting param1 and param2
> as "byRef" parameters:
>
> function myFunction(param1,param2)
> 'do something
> end function
>
>
> am i correct?
It depends on how you call the function. The default is byref, but the
method used to call the function can override this. Specifically, enclosing
an argument in parentheses when not consuming the return value will force it
to be passed by value (sort of):
function test(arg)
arg=arg + 1
test=arg
end function
val = 1
response.write "Return value discarded, parens not used: " & _
val & "<BR>"
test val
response.write val & "<BR>"
val=1
test(val)
response.write "Return value discarded, parens used: " _
& val & "<BR>"
val=1
newval=test(val)
response.write "Return value used, parens used: " _
& val & "<BR>"
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