Splitting fpdfdoc/doc_* part II.

core/fpdfdoc/cpvt_arraytemplate.h

+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef CORE_FPDFDOC_CPVT_ARRAYTEMPLATE_H_
+#define CORE_FPDFDOC_CPVT_ARRAYTEMPLATE_H_
+
+#include "core/fxcrt/include/fx_basic.h"
+#include "core/fxcrt/include/fx_system.h"
+
+template <class TYPE>
+class CPVT_ArrayTemplate : public CFX_ArrayTemplate<TYPE> {
+ public:
+  bool IsEmpty() { return CFX_ArrayTemplate<TYPE>::GetSize() <= 0; }
+
+  TYPE GetAt(int nIndex) const {
+    if (nIndex >= 0 && nIndex < CFX_ArrayTemplate<TYPE>::GetSize())
+      return CFX_ArrayTemplate<TYPE>::GetAt(nIndex);
+    return nullptr;
+  }
+
+  void RemoveAt(int nIndex) {
+    if (nIndex >= 0 && nIndex < CFX_ArrayTemplate<TYPE>::GetSize())
+      CFX_ArrayTemplate<TYPE>::RemoveAt(nIndex);
+  }
+};
+
+#endif  // CORE_FPDFDOC_CPVT_ARRAYTEMPLATE_H_