On 09 Dec 2010, at 22:33, Luis Fernando Del Aguila Mejía wrote:
> I can not understand the data alignment of records.
> I compiled the program PackRecordsDemo,
> http://www.freepascal.org/docs-html/ref/refsu16.html#x40-470003.3.2 sample
> documentation.
> But the result on my computer is different:
>
> Size Trec1 : 4 Offset B : 2
> Size Trec2 : 3 Offset B : 1
> Size Trec3 : 2 Offset B : 1
> Size Trec4 : 2 Offset B : 1
> Size Trec5 : 5 Offset B : 1 Offset C : 4 //diferent
> Size Trec6 : 5 Offset B : 1 Offset C : 4 //diferent
> Size Trec7 : 9 Offset B : 1 Offset C : 8 //diferent
> Size Trec8 : 9 Offset B : 1 Offset C : 8 //diferent
The output in the manual is wrong (and it should probably use ptrint rather
than longint), and probably from a very old FPC version. The output you posted
above is the expected output.
> Can someone explain to me, about the alignment of registration data and other
> variables.
The alignment of an array is the same as the alignment of its element types, so
for an array of byte that is 1 -> all of the array fields are aligned to 1
byte. I don't know what you mean by "registration data".
Jonas
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