[fpc-devel] constref in Windows
DrDiettrich1 at aol.com
Sat Nov 20 19:10:24 CET 2010
Jonas Maebe schrieb:
>> Const is a pascal keyword which can mean for pascal "pass records
>> by reference".
> Making it mean that would make a lot of code less efficient. It
> doesn't have that meaning for the i386 "register" calling convention
> either (and it cannot be made to mean that there, because that would
> break Delphi compatibility).
AFAIR Delphi treats the byval/byref issue as "compiler specific", so
nothing can be broken - apart from code that is bound to an specific
>> If you need to pass a record by value to some system C routine then
>> don't mark that argument as const during the header convertion.
>> What is wrong?
A const record cannot be passed as a non-const parameter. This is the
only difference between constref and var. Thus "const var" could have
been used instead of a new "constref" keyword.
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