abstract_attribute_tree.h

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//
// Created by henri on 10/11/21.
//
 
#ifndef STATE_MACHINE_CPP_ABSTRACT_ATTRIBUTE_TREE_H
#define STATE_MACHINE_CPP_ABSTRACT_ATTRIBUTE_TREE_H
 
namespace state_machine_cpp {
    class AbstractLayer;
    class AbstractAttributeTree;
 
    namespace Impl {
        template<class ...X> struct merge;
    }
}
 
class state_machine_cpp::AbstractAttributeTree {
protected:
    friend class Context;
    template<class ...X> friend struct Impl::merge;
 
    virtual AbstractLayer& layer(unsigned int t_i) = 0;
 
    [[nodiscard]] virtual const AbstractLayer& layer(unsigned int t_i) const {
        return const_cast<AbstractAttributeTree&>(*this).layer(t_i);
    }
 
public:
 
    virtual ~AbstractAttributeTree() = default;
 
};
 
 
#endif //STATE_MACHINE_CPP_ABSTRACT_ATTRIBUTE_TREE_H