RE: [CONNECT C++] MSElementUnion type

[quote user="Zhen Li"]I used type "MSElementUnion" in my older MDL application. But I can not find in the CONNECT SDK[/quote]

The large element union mselement was typedef'd to both MSElementUnion and MSElementin earlier versions of MicroStation.  I don't think many of us used MSElementUnion, since it's just a longer name for that data type.

#include <DgnPlatformBaseType.r.h>
#include <DgnElements.h>

With CONNECT the name of the element union is simply MSElement.  Additionally, as with most of the C++ API, it's in a namespace.  Its real name is DgnPlatform::MSElement.  Taking advantage of the C++ language, it contains some methods, so you can ask questions like this...

DgnPlatform::MSElement el;
... get element from somewhere
DgnPlatform::ElementId id = el.GetID ();
bool isComplex = el.IsComplexHeader ();

You normally would eliminate the need for the namespace by writing a using statement.  The SDK provides some namespace macros to make it easier to write them.  In this case, USING_NAMESPACE_BENTLEY_DGNPLATFORM...

USING_NAMESPACE_BENTLEY_DGNPLATFORM;
MSElement el;
... get element from somewhere
ElementId id = el.GetID ();
bool isComplex = el.IsComplexHeader ();