Merge pull request #1556 from assimp/issue_1292

closes https://github.com/assimp/assimp/issues/1292: export class sub…

code/Subdivision.h

@@ -40,10 +40,13 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
 /** @file Defines a helper class to evaluate subdivision surfaces.*/
+#pragma once
 #ifndef AI_SUBDISIVION_H_INC
 #define AI_SUBDISIVION_H_INC
 
 #include <cstddef>
+#include <assimp/types.h>
+
 struct aiMesh;
 
 namespace Assimp    {
@@ -52,8 +55,7 @@ namespace Assimp    {
 /** Helper class to evaluate subdivision surfaces. Different algorithms
  *  are provided for choice. */
 // ------------------------------------------------------------------------------
-class Subdivider
-{
+class ASSIMP_API Subdivider {
 public:
 
     /** Enumerates all supported subvidision algorithms */
@@ -61,12 +63,7 @@ public:
         CATMULL_CLARKE = 0x1
     };
 
-public:
-
-    virtual ~Subdivider() {
-    }
-
-public:
+    virtual ~Subdivider();
 
     // ---------------------------------------------------------------
     /** Create a subdivider of a specific type
@@ -119,9 +116,13 @@ public:
         unsigned int num,
         bool discard_input = false) = 0;
 
-private:
 };
 
+inline
+Subdivider::~Subdivider() {
+    // empty
+}
+
 } // end namespace Assimp