upgrade to Filament 1.21.0

ios/include/utils/PrivateImplementation-impl.h

@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2022 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 UTILS_PRIVATEIMPLEMENTATION_IMPL_H
+#define UTILS_PRIVATEIMPLEMENTATION_IMPL_H
+
+/*
+ * This looks like a header file, but really it acts as a .cpp, because it's used to
+ * explicitly instantiate the methods of PrivateImplementation<>
+ */
+
+#include <utils/PrivateImplementation.h>
+
+#include <utility>
+
+namespace utils {
+
+template<typename T>
+PrivateImplementation<T>::PrivateImplementation() noexcept
+        : mImpl(new T) {
+}
+
+template<typename T>
+template<typename ... ARGS>
+PrivateImplementation<T>::PrivateImplementation(ARGS&& ... args) noexcept
+        : mImpl(new T(std::forward<ARGS>(args)...)) {
+}
+
+template<typename T>
+PrivateImplementation<T>::~PrivateImplementation() noexcept {
+    delete mImpl;
+}
+
+#ifndef UTILS_PRIVATE_IMPLEMENTATION_NON_COPYABLE
+
+template<typename T>
+PrivateImplementation<T>::PrivateImplementation(PrivateImplementation const& rhs) noexcept
+        : mImpl(new T(*rhs.mImpl)) {
+}
+
+template<typename T>
+PrivateImplementation<T>& PrivateImplementation<T>::operator=(PrivateImplementation<T> const& rhs) noexcept {
+    if (this != &rhs) {
+        *mImpl = *rhs.mImpl;
+    }
+    return *this;
+}
+
+#endif
+
+} // namespace utils
+
+#endif // UTILS_PRIVATEIMPLEMENTATION_IMPL_H