castable.h

/*
 * SPDX-FileCopyrightText: 2022 VMware, Inc.
 * Copyright 2022-present VMware, Inc.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#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_ */