update external headers

ios/src/upcast.h

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef TNT_FILAMENT_UPCAST_H
+#define TNT_FILAMENT_UPCAST_H
+
+/*
+ * Generates functions to safely upcast a pointer Bar* to FBar*
+ * FILAMENT_UPCAST() should be included in the header file
+ * declaring FBar, e.g.:
+ *
+ * #include <Bar.h>
+ *
+ * class FBar : public Bar {
+ * };
+ *
+ * FILAMENT_UPCAST(Bar)
+ *
+ */
+
+#define FILAMENT_UPCAST(CLASS)                                      \
+    inline F##CLASS& upcast(CLASS& that) noexcept {                 \
+        return static_cast<F##CLASS &>(that);                       \
+    }                                                               \
+    inline const F##CLASS& upcast(const CLASS& that) noexcept {     \
+        return static_cast<const F##CLASS &>(that);                 \
+    }                                                               \
+    inline F##CLASS* upcast(CLASS* that) noexcept {                 \
+        return static_cast<F##CLASS *>(that);                       \
+    }                                                               \
+    inline F##CLASS const* upcast(CLASS const* that) noexcept {     \
+        return static_cast<F##CLASS const *>(that);                 \
+    }
+
+#endif // TNT_FILAMENT_UPCAST_H