#pragma pack effect

user_330401 0
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I was wondering if someone could explain to me what the #pragma pack preprocessor statement does, and more importantly, why one would want to use it.

I checked out the MSDN page, which offered some insight, but I was hoping to hear more from people with experience. I've seen it in code before, though I can't seem to find where anymore.

pragma-pack c-preprocessor c
11 Answers

Why one want to use it ?

To reduce the memory of the structure

Why one should not use it ?

  1. This may lead to performance penalty, because some system works better on aligned data
  2. Some machine will fail to read unaligned data
  3. Code is not portable
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