Michael Van Canneyt wrote:
Maybe, but nowhere in the Delphi 7 documentation it is stated that const
implies passing by reference. It MAY happen, but it's not guaranteed.
I think it is guaranteed that it will be passed by reference because it
is a big structure (at least 16 bytes). Nothing to do with the const.
Perhaps D5 documentation is more clean and clear:
"Variable (var) parameters are always passed by reference, as 32-bit
pointers that point to the actual storage location.
Value and constant (const) parameters are passed by value or by
reference, *depending on the type and size* of the parameter:"
"Sets, records, and static arrays of 1, 2, or 4 bytes are passed as
8-bit, 16-bit, and 32-bit values. Larger sets, records, and static
arrays are passed as 32-bit pointers to the value. An exception to this
rule is that records are always passed directly on the stack under the
cdecl, stdcall, and safecall conventions; the size of a record passed
this way is rounded upward to the nearest double-word boundary."
I am not sure how to interprete this. I think we really need some
compiler guys...
Felipe
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