/*
 * 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