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/**
** \file type/visitor.hh
** \brief Definition of type::Visitor.
*/
#pragma once
#include <misc/select-const.hh>
#include <type/fwd.hh>
namespace type
{
/** \brief Root class of all Type visitors.
**
** GenVisitor<CONSTIFY> is the root class of all Type visitors. */
template <template <typename> class Const> class GenVisitor
{
/** \name Ctor & dtor.
** \{ */
public:
/// Convenient abbreviation.
template <typename T> using const_t = typename Const<T>::type;
/// Destroy a GenVisitor.
virtual ~GenVisitor();
/** \} */
/// The entry point: visit \a e.
virtual void operator()(const_t<Type>& e);
virtual void operator()(const_t<Nil>&) = 0;
virtual void operator()(const_t<Void>&) = 0;
virtual void operator()(const_t<Int>&) = 0;
virtual void operator()(const_t<String>&) = 0;
virtual void operator()(const_t<Named>&) = 0;
virtual void operator()(const_t<Array>&) = 0;
virtual void operator()(const_t<Record>&) = 0;
virtual void operator()(const_t<Class>&) = 0;
virtual void operator()(const_t<Function>&) = 0;
virtual void operator()(const_t<Method>&) = 0;
/// Helper to visit nodes manipulated via a pointer.
template <class E> void operator()(E* e);
};
/// Shorthand for a const visitor.
using ConstVisitor = GenVisitor<misc::constify_traits>;
/// Shorthand for a non const visitor.
using Visitor = GenVisitor<misc::id_traits>;
#ifdef SWIG
/// Shorthand for a const visitor.
%template(GenConstVisitor) GenVisitor<misc::constify_traits>;
/// Shorthand for a non const visitor.
%template(GenVisitor) GenVisitor<misc::id_traits>;
#endif
} // namespace type
#include <type/visitor.hxx>
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