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.

Compiler Warning (level 4) C4820

Error Message

'bytes' bytes padding added after construct 'member_name'

The type and order of elements caused the compiler to add padding to the end of a struct. See align for more information on padding in a struct.

This warning is off by default. See Compiler Warnings That Are Off by Default for more information.

The following sample generates C4820:

// C4820.cpp
// compile with: /W4 /c
#pragma warning(default : 4820) 

// Delete the following 4 lines to resolve.
__declspec(align(2)) struct MyStruct {
   char a;
   int i;   // C4820
};

// OK
#pragma pack(1)
__declspec(align(1)) struct MyStruct2 {
   char a;
   int i;
};

Community Additions

ADD
Show:
© 2015 Microsoft