Re: Number of compiler passes

Michiel wrote:
(snip)


> If it cannot be a an r-value, it is a writeonly expression. This is seen
> less often, but can occur for formal parameters of the 'out' direction. (As
> opposed to 'in' or 'inout'.) Or for properties that have a setter method
> but no getter method.


I believe for Fortran INTENT(OUT) dummy variables, you must
write first, but you can then read the value just as any other
variable. They are not write-only.


Among other reasons, Fortran allows either call by reference
or call by value result (sometimes called copy-in copy-out).
In the latter case, INTENT(OUT) might not do the copy in.
It can also affect the way the optimizer works.


-- glen

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