castable.h

/*
Copyright 2022-present VMware, Inc.
 
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 LIB_CASTABLE_H_
#define LIB_CASTABLE_H_
 
#include <typeinfo>
 
#include "lib/exceptions.h"
#include "lib/rtti.h"
 
namespace P4 {
 
class ICastable : public virtual RTTI::Base {
 public:
    virtual ~ICastable() = default;
 
    template <typename T>
    const T &as() const {
        return *checkedTo<T>();
    }
 
    template <typename T>
    T &as() {
        return *checkedTo<T>();
    }
 
    template <typename T>
    const T *checkedTo() const {
        auto *result = to<T>();
        BUG_CHECK(result, "Cast failed: %1% is not a %2%", this, typeid(T).name());
        return result;
    }
 
    template <typename T>
    T *checkedTo() {
        auto *result = to<T>();
        BUG_CHECK(result, "Cast failed: %1% is not a %2%", this, typeid(T).name());
        return result;
    }
};
 
}  // namespace P4
 
#endif /* LIB_CASTABLE_H_ */