Add type cast definitions for CPDF_Reference.

core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp

Index: core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
diff --git a/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp b/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
index 16124a3c38dbae0694e2560e0d1413d9251a090a..54cce94b9f0f1483de2b9c44a62f41e680983018 100644
--- a/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
+++ b/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
@@ -64,7 +64,7 @@ int32_t PDF_CreatorAppendObject(const CPDF_Object* pObj,
       if (pFile->AppendString(FX_BSTRC(" ")) < 0) {
         return -1;
       }
-      CPDF_Reference* p = (CPDF_Reference*)pObj;
+      const CPDF_Reference* p = pObj->AsReference();

[Lei Zhang, 2015/10/22 21:26:51]

I think you can just fold |p| into the next line. It should just fit 80 chars /
col. Ditto below.

[dsinclair, 2015/10/26 13:55:44]

Done.

       if ((len = pFile->AppendDWord(p->GetRefObjNum())) < 0) {
         return -1;
       }
@@ -1171,7 +1171,7 @@ int32_t CPDF_Creator::WriteDirectObj(FX_DWORD objnum,
       if (m_File.AppendString(FX_BSTRC(" ")) < 0) {
         return -1;
       }
-      CPDF_Reference* p = (CPDF_Reference*)pObj;
+      const CPDF_Reference* p = pObj->AsReference();
       if ((len = m_File.AppendDWord(p->GetRefObjNum())) < 0) {
         return -1;
       }