visitor.h

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/******************************************************************************
The MIT License(MIT)
 
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
 
Copyright(c) 2014 John Wellbelove
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions :
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
******************************************************************************/
 
#ifndef ETL_VISITOR_INCLUDED
#define ETL_VISITOR_INCLUDED
 
#include "platform.h"
#include "type_list.h"
#include "type_traits.h"
 
//*****************************************************************************
//*****************************************************************************
 
namespace etl
{
#if ETL_USING_CPP11 && !defined(ETL_VISITOR_FORCE_CPP03_IMPLEMENTATION)
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename... Types>
  class visitable
    : public visitable<T1>
    , public visitable<Types...>
  {
  public:
 
    using visitable<T1>::accept;
    using visitable<Types...>::accept;
    using type_list = etl::type_list<T1, Types...>;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1>
  class visitable<T1>
  {
  public:
 
    using type_list = etl::type_list<T1>;
 
    virtual ~visitable() = default;
 
    virtual void accept(T1&) = 0;
  };
 
  //***************************************************************************
  template <typename TList>
  struct visitable_from_type_list;
 
  template <typename... TTypes>
  struct visitable_from_type_list<etl::type_list<TTypes...>>
  {
    using type = etl::visitable<TTypes...>;
  };
 
  template <typename TTypeList>
  using visitable_from_type_list_t = typename visitable_from_type_list<TTypeList>::type;
 
#else
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename T2 = void, typename T3 = void, typename T4 = void>
  class visitable
  {
  public:
 
    virtual ~visitable() {}
 
    virtual void accept(T1&) = 0;
    virtual void accept(T2&) = 0;
    virtual void accept(T3&) = 0;
    virtual void accept(T4&) = 0;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename T2, typename T3>
  class visitable<T1, T2, T3>
  {
  public:
 
    virtual ~visitable() {}
 
    virtual void accept(T1&) = 0;
    virtual void accept(T2&) = 0;
    virtual void accept(T3&) = 0;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename T2>
  class visitable<T1, T2>
  {
  public:
 
    virtual ~visitable() {}
 
    virtual void accept(T1&) = 0;
    virtual void accept(T2&) = 0;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1>
  class visitable<T1>
  {
  public:
 
    virtual ~visitable() {}
 
    virtual void accept(T1&) = 0;
  };
 
#endif
 
  //*****************************************************************
  //*****************************************************************
  struct visitor_tag
  {
  };
 
#if ETL_USING_CPP11 && !defined(ETL_VISITOR_FORCE_CPP03_IMPLEMENTATION)
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename... Types>
  class visitor
    : public visitor<T1>
    , public visitor<Types...>
  {
  public:
 
    using visitor<T1>::visit;
    using visitor<Types...>::visit;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1>
  class visitor<T1> : public virtual visitor_tag
  {
  public:
 
    virtual ~visitor() = default;
 
    virtual void visit(T1) = 0;
  };
 
  //***************************************************************************
  template <typename TList>
  struct visitor_from_type_list;
 
  template <typename... TTypes>
  struct visitor_from_type_list<etl::type_list<TTypes...>>
  {
    using type = etl::visitor<TTypes...>;
  };
 
  template <typename TTypeList>
  using visitor_from_type_list_t = typename visitor_from_type_list<TTypeList>::type;
 
#else
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename T2 = void, typename T3 = void, typename T4 = void, typename T5 = void, typename T6 = void, typename T7 = void,
            typename T8 = void, typename T9 = void, typename T10 = void, typename T11 = void, typename T12 = void, typename T13 = void,
            typename T14 = void, typename T15 = void, typename T16 = void>
  class visitor : public visitor_tag
  {
  public:
 
    virtual ~visitor() {}
 
    virtual void visit(T1)  = 0;
    virtual void visit(T2)  = 0;
    virtual void visit(T3)  = 0;
    virtual void visit(T4)  = 0;
    virtual void visit(T5)  = 0;
    virtual void visit(T6)  = 0;
    virtual void visit(T7)  = 0;
    virtual void visit(T8)  = 0;
    virtual void visit(T9)  = 0;
    virtual void visit(T10) = 0;
    virtual void visit(T11) = 0;
    virtual void visit(T12) = 0;
    virtual void visit(T13) = 0;
    virtual void visit(T14) = 0;
    virtual void visit(T15) = 0;
    virtual void visit(T16) = 0;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T10,
            typename T11, typename T12, typename T13, typename T14, typename T15>
  class visitor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15> : public visitor_tag
  {
  public:
 
    virtual ~visitor() {}
 
    virtual void visit(T1)  = 0;
    virtual void visit(T2)  = 0;
    virtual void visit(T3)  = 0;
    virtual void visit(T4)  = 0;
    virtual void visit(T5)  = 0;
    virtual void visit(T6)  = 0;
    virtual void visit(T7)  = 0;
    virtual void visit(T8)  = 0;
    virtual void visit(T9)  = 0;
    virtual void visit(T10) = 0;
    virtual void visit(T11) = 0;
    virtual void visit(T12) = 0;
    virtual void visit(T13) = 0;
    virtual void visit(T14) = 0;
    virtual void visit(T15) = 0;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T10,
            typename T11, typename T12, typename T13, typename T14>
  class visitor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14> : public visitor_tag
  {
  public:
 
    virtual ~visitor() {}
 
    virtual void visit(T1)  = 0;
    virtual void visit(T2)  = 0;
    virtual void visit(T3)  = 0;
    virtual void visit(T4)  = 0;
    virtual void visit(T5)  = 0;
    virtual void visit(T6)  = 0;
    virtual void visit(T7)  = 0;
    virtual void visit(T8)  = 0;
    virtual void visit(T9)  = 0;
    virtual void visit(T10) = 0;
    virtual void visit(T11) = 0;
    virtual void visit(T12) = 0;
    virtual void visit(T13) = 0;
    virtual void visit(T14) = 0;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T10,
            typename T11, typename T12, typename T13>
  class visitor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13> : public visitor_tag
  {
  public:
 
    virtual ~visitor() {}
 
    virtual void visit(T1)  = 0;
    virtual void visit(T2)  = 0;
    virtual void visit(T3)  = 0;
    virtual void visit(T4)  = 0;
    virtual void visit(T5)  = 0;
    virtual void visit(T6)  = 0;
    virtual void visit(T7)  = 0;
    virtual void visit(T8)  = 0;
    virtual void visit(T9)  = 0;
    virtual void visit(T10) = 0;
    virtual void visit(T11) = 0;
    virtual void visit(T12) = 0;
    virtual void visit(T13) = 0;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T10,
            typename T11, typename T12>
  class visitor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> : public visitor_tag
  {
  public:
 
    virtual ~visitor() {}
 
    virtual void visit(T1)  = 0;
    virtual void visit(T2)  = 0;
    virtual void visit(T3)  = 0;
    virtual void visit(T4)  = 0;
    virtual void visit(T5)  = 0;
    virtual void visit(T6)  = 0;
    virtual void visit(T7)  = 0;
    virtual void visit(T8)  = 0;
    virtual void visit(T9)  = 0;
    virtual void visit(T10) = 0;
    virtual void visit(T11) = 0;
    virtual void visit(T12) = 0;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T10,
            typename T11>
  class visitor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> : public visitor_tag
  {
  public:
 
    virtual ~visitor() {}
 
    virtual void visit(T1)  = 0;
    virtual void visit(T2)  = 0;
    virtual void visit(T3)  = 0;
    virtual void visit(T4)  = 0;
    virtual void visit(T5)  = 0;
    virtual void visit(T6)  = 0;
    virtual void visit(T7)  = 0;
    virtual void visit(T8)  = 0;
    virtual void visit(T9)  = 0;
    virtual void visit(T10) = 0;
    virtual void visit(T11) = 0;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T10>
  class visitor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> : public visitor_tag
  {
  public:
 
    virtual ~visitor() {}
 
    virtual void visit(T1)  = 0;
    virtual void visit(T2)  = 0;
    virtual void visit(T3)  = 0;
    virtual void visit(T4)  = 0;
    virtual void visit(T5)  = 0;
    virtual void visit(T6)  = 0;
    virtual void visit(T7)  = 0;
    virtual void visit(T8)  = 0;
    virtual void visit(T9)  = 0;
    virtual void visit(T10) = 0;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9>
  class visitor<T1, T2, T3, T4, T5, T6, T7, T8, T9> : public visitor_tag
  {
  public:
 
    virtual ~visitor() {}
 
    virtual void visit(T1) = 0;
    virtual void visit(T2) = 0;
    virtual void visit(T3) = 0;
    virtual void visit(T4) = 0;
    virtual void visit(T5) = 0;
    virtual void visit(T6) = 0;
    virtual void visit(T7) = 0;
    virtual void visit(T8) = 0;
    virtual void visit(T9) = 0;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8>
  class visitor<T1, T2, T3, T4, T5, T6, T7, T8> : public visitor_tag
  {
  public:
 
    virtual ~visitor() {}
 
    virtual void visit(T1) = 0;
    virtual void visit(T2) = 0;
    virtual void visit(T3) = 0;
    virtual void visit(T4) = 0;
    virtual void visit(T5) = 0;
    virtual void visit(T6) = 0;
    virtual void visit(T7) = 0;
    virtual void visit(T8) = 0;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7>
  class visitor<T1, T2, T3, T4, T5, T6, T7> : public visitor_tag
  {
  public:
 
    virtual ~visitor() {}
 
    virtual void visit(T1) = 0;
    virtual void visit(T2) = 0;
    virtual void visit(T3) = 0;
    virtual void visit(T4) = 0;
    virtual void visit(T5) = 0;
    virtual void visit(T6) = 0;
    virtual void visit(T7) = 0;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
  class visitor<T1, T2, T3, T4, T5, T6> : public visitor_tag
  {
  public:
 
    virtual ~visitor() {}
 
    virtual void visit(T1) = 0;
    virtual void visit(T2) = 0;
    virtual void visit(T3) = 0;
    virtual void visit(T4) = 0;
    virtual void visit(T5) = 0;
    virtual void visit(T6) = 0;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename T2, typename T3, typename T4, typename T5>
  class visitor<T1, T2, T3, T4, T5> : public visitor_tag
  {
  public:
 
    virtual ~visitor() {}
 
    virtual void visit(T1) = 0;
    virtual void visit(T2) = 0;
    virtual void visit(T3) = 0;
    virtual void visit(T4) = 0;
    virtual void visit(T5) = 0;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename T2, typename T3, typename T4>
  class visitor<T1, T2, T3, T4> : public visitor_tag
  {
  public:
 
    virtual ~visitor() {}
 
    virtual void visit(T1) = 0;
    virtual void visit(T2) = 0;
    virtual void visit(T3) = 0;
    virtual void visit(T4) = 0;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename T2, typename T3>
  class visitor<T1, T2, T3> : public visitor_tag
  {
  public:
 
    virtual ~visitor() {}
 
    virtual void visit(T1) = 0;
    virtual void visit(T2) = 0;
    virtual void visit(T3) = 0;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1, typename T2>
  class visitor<T1, T2> : public visitor_tag
  {
  public:
 
    virtual ~visitor() {}
 
    virtual void visit(T1) = 0;
    virtual void visit(T2) = 0;
  };
 
  //*****************************************************************
  //*****************************************************************
  template <typename T1>
  class visitor<T1> : public visitor_tag
  {
  public:
 
    virtual ~visitor() {}
 
    virtual void visit(T1) = 0;
  };
 
#endif
 
  //*****************************************************************
  //*****************************************************************
  template <typename T>
  struct is_visitor : public etl::bool_constant<etl::is_base_of<etl::visitor_tag, T>::value>
  {
  };
 
#if ETL_USING_CPP17
  //*****************************************************************
  //*****************************************************************
  template <typename T>
  constexpr bool is_visitor_v = etl::is_visitor<T>::value;
#endif
} // namespace etl
 
#endif