From 4207a46f07d70cbba7de5124445be28235ebd0f0 Mon Sep 17 00:00:00 2001
From: Mark Pictor <mpictor@gmail.com>
Date: Sun, 9 Aug 2015 23:30:13 -0400
Subject: [PATCH] fix MSVC link error for NilSTEPentity

---
 src/cldai/sdaiApplication_instance_set.cc  | 2 ++
 src/cllazyfile/lazyInstMgr.cc              | 4 +++-
 src/cllazyfile/sectionReader.cc            | 3 +--
 src/clstepcore/sdaiApplication_instance.cc | 7 +++++++
 src/clstepcore/sdaiApplication_instance.h  | 1 +
 5 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/src/cldai/sdaiApplication_instance_set.cc b/src/cldai/sdaiApplication_instance_set.cc
index c50fdc0e..30a9103f 100644
--- a/src/cldai/sdaiApplication_instance_set.cc
+++ b/src/cldai/sdaiApplication_instance_set.cc
@@ -31,6 +31,8 @@
 #include <math.h>
 #include "sc_memmgr.h"
 
+#include "sdaiApplication_instance.h"
+
 // to help ObjectCenter
 #ifndef HAVE_MEMMOVE
 extern "C"
diff --git a/src/cllazyfile/lazyInstMgr.cc b/src/cllazyfile/lazyInstMgr.cc
index 2ad57c04..7ce253ee 100644
--- a/src/cllazyfile/lazyInstMgr.cc
+++ b/src/cllazyfile/lazyInstMgr.cc
@@ -6,6 +6,8 @@
 #include "instMgrHelper.h"
 #include "lazyRefs.h"
 
+#include "sdaiApplication_instance.h"
+
 lazyInstMgr::lazyInstMgr() {
     _headerRegistry = new Registry( HeaderSchemaInit );
     _instanceTypes = new instanceTypes_t( 255 ); //NOTE arbitrary max of 255 chars for a type name
@@ -137,7 +139,7 @@ SDAI_Application_instance * lazyInstMgr::loadInstance( instanceID id, bool reSee
                 std::cerr << "Instance #" << id << " exists in multiple sections. This is not yet supported." << std::endl;
                 break;
         }
-        if( ( inst ) && ( inst != & NilSTEPentity ) ) {
+        if( !isNilSTEPentity( inst ) ) {
             _instancesLoaded.insert( id, inst );
             _loadedInstanceCount++;
             lazyRefs lr( this, inst );
diff --git a/src/cllazyfile/sectionReader.cc b/src/cllazyfile/sectionReader.cc
index 8de914de..bd3d9c23 100644
--- a/src/cllazyfile/sectionReader.cc
+++ b/src/cllazyfile/sectionReader.cc
@@ -302,8 +302,7 @@ SDAI_Application_instance * sectionReader::getRealInstance( const Registry * reg
             inst = reg->ObjCreate( tName, sName );
             break;
     }
-
-    if( inst != & NilSTEPentity ) {
+    if( !isNilSTEPentity( inst ) ) {
         if( !comment.empty() ) {
             inst->AddP21Comment( comment );
         }
diff --git a/src/clstepcore/sdaiApplication_instance.cc b/src/clstepcore/sdaiApplication_instance.cc
index a3b61b79..d3b3c9d7 100644
--- a/src/clstepcore/sdaiApplication_instance.cc
+++ b/src/clstepcore/sdaiApplication_instance.cc
@@ -24,6 +24,13 @@
 
 SDAI_Application_instance NilSTEPentity;
 
+bool isNilSTEPentity( const SDAI_Application_instance * ai ) {
+    if( ai && ai == &NilSTEPentity ) {
+        return true;
+    }
+    return false;
+}
+
 /**************************************************************//**
 ** \file sdaiApplication_instance.cc  Functions for manipulating entities
 **
diff --git a/src/clstepcore/sdaiApplication_instance.h b/src/clstepcore/sdaiApplication_instance.h
index e451f97b..f314c764 100644
--- a/src/clstepcore/sdaiApplication_instance.h
+++ b/src/clstepcore/sdaiApplication_instance.h
@@ -196,5 +196,6 @@ class SC_CORE_EXPORT SDAI_Application_instance  : public SDAI_DAObject_SDAI  {
 // current style of CORBA handles for Part 23 - NOTE - used for more than CORBA
 typedef SDAI_Application_instance * SDAI_Application_instance_ptr;
 typedef SDAI_Application_instance_ptr SDAI_Application_instance_var;
+SC_CORE_EXPORT bool isNilSTEPentity( const SDAI_Application_instance * ai );
 
 #endif //STEPENTITY_H