What does this mean in C++ AType(Ptr)[index]

[SGi]

I wonder if anyone here knew Pascal before C++, perhaps you could help me
out. I'm converting some pascal code into C++, and I can't seem to
understand what AType(Ptr)[index] is trying to accomplish. Any helps would
be appreciated. Thanks.

type
AType = array[0..$FF] of byte;

var Ptr : Pointer;

Move(AType(Ptr)[index], dest_word, 2);

[SGi]

> Another one! What makes you think that "Move(AType(Ptr )[index], .."

is not a C++ expression. For all I know about C++, that expression
surely looks like C++. I just explained what it is in C++. Did you
think otherwise? What gave you that idea?

Move((void*)sta tic_cast<BYTE*> (Ptr)[index], &w, 2);
Almost pure C++...

[Rolf Magnus]

Victor Bazarov wrote:

Rolf Magnus wrote:

Victor Bazarov wrote:

mlimber wrote:
SGi wrote:
> I wonder if anyone here knew Pascal before C++, perhaps you could
> help me out. I'm converting some pascal code into C++, and I can't
> seem to understand what AType(Ptr)[index] is trying to accomplish.
> Any helps would be appreciated. Thanks.
>
> type
> AType = array[0..$FF] of byte;
>
> var Ptr : Pointer;
>
> Move(AType(Ptr)[index], dest_word, 2);

This is a Pascal (or perhaps Delphi) question and should be asked
in a more appropriate forum. See this FAQ for what is on-topic here
and for some possible forums you can post in:

http://www.parashift.com/c++-faq-lit...t.html#faq-5.9

Cheers! --M

Don't just the gun, M. In the expression

Move(AType(Ptr)[index], ...

The part

AType(Ptr)[index]

is an explicit type conversion from 'Ptr' to 'AType' ("functional
notation") and then applying of the indexing operator to it.

Maybe that's the case. I don't know Pascal. Anyway, since we're not
in a Pascal group, this is off-topic.

Another one! What makes you think that "Move(AType(Ptr )[index], .."
is not a C++ expression.
For all I know about C++, that expression
surely looks like C++. I just explained what it is in C++. Did you
think otherwise? What gave you that idea?

The OP. He wanted some Pascal code converted to C++ and wanted to know how
to do that for a specific piece of code. And that piece was:

> type
> AType = array[0..$FF] of byte;
>
> var Ptr : Pointer;
>
> Move(AType(Ptr)[index], dest_word, 2);

So what gave you the idea that the last line is supposed to be C++? Just
that it looked like C++? Where would he get that line from without knowing
what it means if he wants to convert Pascal code to C++?