Visitor< Tag, Visitables > Class Template Reference

#include <visitor.h>

Public Types
using	visitable_types = std::tuple< Visitables... >

Public Member Functions
template<class T >
auto	operator() (T &t) -> std::enable_if_t< is_within< T, visitable_types >::value, void >
template<class... Fs>
	Visitor (Fs &&... fs)

Detailed Description

template<class Tag, class... Visitables>
class Visitor< Tag, Visitables >

Visitor type generator for types included in visitable_types. Produces type-safe instance of Visitor per given Tag and a type-list of Visitables (at least one). User shall derive publicly from this type Visitor<Tag, Vs...> (tag can be the name of the derived type), and inherit Visitor constructor. Visitable types must be derived from VisitableWith<T> where T is the name of the visitor. Do not pass references in Visitables type-list.

Example

struct Example
  : Visitor<
        Example      // tag
      , A, B, C, D   // visitable types
      >
{
    using Visitor::Visitor;
};

See also

CanNodeDataModelVisitor for an example

http://insooth.github.io/visitor-pattern.md for an article

Member Typedef Documentation

visitable_types

template<class Tag , class... Visitables>

using Visitor< Tag, Visitables >::visitable_types = std::tuple<Visitables...>

Constructor & Destructor Documentation

Visitor()

template<class Tag , class... Visitables>

template<class... Fs>

Visitor< Tag, Visitables >::Visitor ( Fs &&...  fs )

inline

Member Function Documentation

operator()()

template<class Tag , class... Visitables>

template<class T >

auto Visitor< Tag, Visitables >::operator() ( T &  t ) -> std::enable_if_t<is_within<T, visitable_types>::value, void>

inline

else: noop – action not specified

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The documentation for this class was generated from the following file:

• src/common/visitor.h