Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Export (0) Print
Expand All
Expand Minimize
Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

/Zp (Struct Member Alignment)

Controls how the members of a structure are packed into memory and specifies the same packing for all structures in a module.

/Zp[1|2|4|8|16]

When you specify this option, each structure member after the first is stored on either the size of the member type or n-byte boundaries (where n is 1, 2, 4, 8, or 16), whichever is smaller.

The available values are described in the following table.

1

Packs structures on 1-byte boundaries. Same as /Zp.

2

Packs structures on 2-byte boundaries.

4

Packs structures on 4-byte boundaries.

8

Packs structures on 8-byte boundaries (default).

16

Packs structures on 16-byte boundaries.

You should not use this option unless you have specific alignment requirements.

You can also use pack to control structure packing. For more information about alignment, see:

To set this compiler option in the Visual Studio development environment

  1. Open the project's Property Pages dialog box. For details, see How to: Open Project Property Pages.

  2. Click the C/C++ folder.

  3. Click the Code Generation property page.

  4. Modify the Struct Member Alignment property.

To set this compiler option programmatically

Community Additions

ADD
Show:
© 2015 Microsoft