[Dev-C++] non-aggregate type?

[Jakob E. <mai...@ko...>]

This line of code
components =3D int (texmap->format.BitsPerPixel/32);

gives me this error message?

860 C:\Documents and =20
Settings\Jakob\Programering\test\stencil_shadow\wavefront.h request for =20
member `BitsPerPixel' in ` texmap->SDL_Surface::format', which is of =20
non-aggregate type `


What is an "non-aggregate type"?