You've already forked libart-paperback
72 lines
1.1 KiB
C++
72 lines
1.1 KiB
C++
#ifndef libart_paperback__visitor_hxx_
|
|
#define libart_paperback__visitor_hxx_
|
|
|
|
namespace Art::Paperback
|
|
{
|
|
|
|
/// Virtual base class for visitors.
|
|
///
|
|
class Visitor
|
|
{
|
|
protected:
|
|
Visitor() = default;
|
|
|
|
virtual
|
|
~Visitor() noexcept = default;
|
|
|
|
};
|
|
|
|
/// Base class for visitors of type T.
|
|
///
|
|
template<typename T>
|
|
class Basic_visitor
|
|
{
|
|
public:
|
|
/// Visit.
|
|
///
|
|
/// \param visitee The visitee.
|
|
///
|
|
virtual
|
|
void
|
|
visit(T& visitee)
|
|
{
|
|
visit(const_cast<T const&>(visitee));
|
|
}
|
|
|
|
/// Visit.
|
|
///
|
|
/// \param visitee The visitee.
|
|
///
|
|
virtual
|
|
void
|
|
visit(T const& visitee) = 0;
|
|
|
|
protected:
|
|
/// Constructor.
|
|
///
|
|
Basic_visitor() = default;
|
|
|
|
/// Destructor.
|
|
///
|
|
virtual
|
|
~Basic_visitor() noexcept = default;
|
|
|
|
};
|
|
|
|
/// Accept visitor on visitee.
|
|
///
|
|
/// \param visitee The visitee.
|
|
/// \param v The visitor.
|
|
///
|
|
template<typename T>
|
|
void
|
|
accept(T const& visitee, Visitor& v)
|
|
{
|
|
auto& v_cast = dynamic_cast<Basic_visitor<T>&>(v);
|
|
v_cast.visit(visitee);
|
|
}
|
|
|
|
} // namespace Art::Paperback
|
|
|
|
#endif
|