// Copyright {Jagger Software Limited} 2003

#ifndef GRAMMAR_SYMBOL_DEFINITION_INCLUDED
#define GRAMMAR_SYMBOL_DEFINITION_INCLUDED

#include "grammar/key_type.hpp"
#include <iosfwd>

namespace grammar
{
    class visitor;
    
    class symbol_definition // {abstract}
    {
    protected: // 'tors

        symbol_definition(const key_type &, const char *);
        // compiler generated copy c'tor ok
        // compiler generated non-virtual d'tor ok

    public: // attributes

        const key_type     key;
        const char * const name;

    public: // visiting
    
        virtual bool accept(visitor &) const = 0;    
        
    public: // streaming
    
        virtual void write(::std::ostream &) const = 0;
       
    };

    // streaming
    
    ::std::ostream & operator<<(::std::ostream &, const symbol_definition &);    
}

#endif