Compiler Error C2023

'identifier': Alignment (value-1) different from prior declaration (value-2)

Remarks

The compiler found an alignment specifier for a class type that's different from a previous declaration, or an enum alignment specifier that's different from the natural alignment of the base type.

To resolve this error, make sure all declarations and definitions of the type use the same alignment value.

Example

The following example generates C2023:

// C2023.cpp
class alignas(2) C;

class alignas(4) C {};   // C2023

Possible resolution:

// C2023b.cpp
// compile with: /c
class alignas(2) C;

class alignas(2) C {};