598 lines
19 KiB
C
598 lines
19 KiB
C
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///\file
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/******************************************************************************
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The MIT License(MIT)
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Embedded Template Library.
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https://github.com/ETLCPP/etl
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https://www.etlcpp.com
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Copyright(c) 2014 John Wellbelove
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files(the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions :
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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******************************************************************************/
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#ifndef ETL_VISITOR_INCLUDED
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#define ETL_VISITOR_INCLUDED
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#include "platform.h"
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#include "type_traits.h"
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//*****************************************************************************
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///\defgroup visitor visitor
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/// A set of template classes for easy implementation of the visitor pattern.<br>
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/// The visitor design pattern is a way of separating an algorithm from an object
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/// structure on which it operates. A practical result of this separation is the
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/// ability to add new operations to existing object structures without modifying
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/// those structures. It is one way to easily follow the open/closed principle.
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/// In essence, the visitor allows one to add new virtual functions to a family
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/// of classes without modifying the classes themselves; instead, one creates a
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/// visitor class that implements all of the appropriate specialisations of the
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/// virtual function. The visitor takes the instance as input, and implements
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/// the goal through double dispatch.<br>
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/// \ingroup patterns
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//*****************************************************************************
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namespace etl
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{
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#if ETL_USING_CPP11 && !defined(ETL_VISITOR_FORCE_CPP03_IMPLEMENTATION)
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//*****************************************************************
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/// The visitable class for N types.
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///\ingroup visitor
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//*****************************************************************
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template <typename T1, typename... Types>
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class visitable : public visitable<T1>, public visitable<Types...>
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{
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public:
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using visitable<T1>::accept;
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using visitable<Types...>::accept;
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};
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//*****************************************************************
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/// The specialised visitable class for 1 type.
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///\ingroup visitor
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//*****************************************************************
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template <typename T1>
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class visitable<T1>
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{
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public:
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virtual ~visitable() = default;
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virtual void accept(T1&) = 0;
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};
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#else
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//*****************************************************************
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/// The visitable base class for four visitor types.
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/// Derive visitable classes from this.
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///\ingroup visitor
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//*****************************************************************
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template <typename T1, typename T2 = void, typename T3 = void, typename T4 = void>
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class visitable
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{
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public:
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virtual ~visitable() {}
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virtual void accept(T1&) = 0;
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virtual void accept(T2&) = 0;
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virtual void accept(T3&) = 0;
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virtual void accept(T4&) = 0;
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};
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//*****************************************************************
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/// The visitable base class for three visitor types.
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/// Derive visitable classes from this.
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///\ingroup visitor
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//*****************************************************************
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template <typename T1, typename T2, typename T3>
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class visitable<T1, T2, T3>
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{
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public:
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virtual ~visitable() {}
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virtual void accept(T1&) = 0;
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virtual void accept(T2&) = 0;
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virtual void accept(T3&) = 0;
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};
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//*****************************************************************
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/// The visitable base class for two visitor types.
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/// Derive visitable classes from this.
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///\ingroup visitor
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//*****************************************************************
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template <typename T1, typename T2>
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class visitable<T1, T2>
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{
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public:
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virtual ~visitable() {}
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virtual void accept(T1&) = 0;
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virtual void accept(T2&) = 0;
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};
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//*****************************************************************
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/// The visitable base class for one visitor type.
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/// Derive visitable classes from this.
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///\ingroup visitor
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//*****************************************************************
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template <typename T1>
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class visitable<T1>
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{
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public:
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virtual ~visitable() {}
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virtual void accept(T1&) = 0;
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};
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#endif
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//*****************************************************************
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/// The tag to identify an etl::visitor.
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///\ingroup visitor
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//*****************************************************************
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struct visitor_tag
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{
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};
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#if ETL_USING_CPP11 && !defined(ETL_VISITOR_FORCE_CPP03_IMPLEMENTATION)
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//*****************************************************************
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/// The visitor class for N types.
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///\ingroup visitor
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//*****************************************************************
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template <typename T1, typename... Types>
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class visitor : public visitor<T1>, public visitor<Types...>
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{
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public:
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using visitor<T1>::visit;
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using visitor<Types...>::visit;
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};
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//*****************************************************************
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/// The specialised visitor class for 1 type.
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///\ingroup visitor
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//*****************************************************************
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template <typename T1>
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class visitor<T1> : public virtual visitor_tag
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{
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public:
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virtual ~visitor() = default;
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virtual void visit(T1) = 0;
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};
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#else
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//*****************************************************************
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/// The visitor base class for sixteen types.
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/// Derive visitors from this.
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///\ingroup visitor
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//*****************************************************************
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template <typename T1, typename T2 = void, typename T3 = void, typename T4 = void,
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typename T5 = void, typename T6 = void, typename T7 = void, typename T8 = void,
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typename T9 = void, typename T10 = void, typename T11 = void, typename T12 = void,
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typename T13 = void, typename T14 = void, typename T15 = void, typename T16 = void>
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class visitor : public visitor_tag
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{
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public:
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virtual ~visitor() {}
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virtual void visit(T1) = 0;
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virtual void visit(T2) = 0;
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virtual void visit(T3) = 0;
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virtual void visit(T4) = 0;
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virtual void visit(T5) = 0;
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virtual void visit(T6) = 0;
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virtual void visit(T7) = 0;
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virtual void visit(T8) = 0;
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virtual void visit(T9) = 0;
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virtual void visit(T10) = 0;
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virtual void visit(T11) = 0;
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virtual void visit(T12) = 0;
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virtual void visit(T13) = 0;
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virtual void visit(T14) = 0;
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virtual void visit(T15) = 0;
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virtual void visit(T16) = 0;
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};
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//*****************************************************************
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/// The visitor base class for fifteen types.
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/// Derive visitors from this.
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///\ingroup visitor
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//*****************************************************************
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template <typename T1, typename T2, typename T3, typename T4,
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typename T5, typename T6, typename T7, typename T8,
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typename T9, typename T10, typename T11, typename T12,
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typename T13, typename T14, typename T15>
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class visitor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15> : public visitor_tag
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{
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public:
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virtual ~visitor() {}
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virtual void visit(T1) = 0;
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virtual void visit(T2) = 0;
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virtual void visit(T3) = 0;
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virtual void visit(T4) = 0;
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virtual void visit(T5) = 0;
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virtual void visit(T6) = 0;
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virtual void visit(T7) = 0;
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virtual void visit(T8) = 0;
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virtual void visit(T9) = 0;
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virtual void visit(T10) = 0;
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virtual void visit(T11) = 0;
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virtual void visit(T12) = 0;
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virtual void visit(T13) = 0;
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virtual void visit(T14) = 0;
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virtual void visit(T15) = 0;
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};
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//*****************************************************************
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/// The visitor base class for fourteen types.
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/// Derive visitors from this.
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///\ingroup visitor
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//*****************************************************************
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template <typename T1, typename T2, typename T3, typename T4,
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typename T5, typename T6, typename T7, typename T8,
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typename T9, typename T10, typename T11, typename T12,
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typename T13, typename T14>
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class visitor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14> : public visitor_tag
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{
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public:
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virtual ~visitor() {}
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virtual void visit(T1) = 0;
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virtual void visit(T2) = 0;
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virtual void visit(T3) = 0;
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virtual void visit(T4) = 0;
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virtual void visit(T5) = 0;
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virtual void visit(T6) = 0;
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virtual void visit(T7) = 0;
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virtual void visit(T8) = 0;
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virtual void visit(T9) = 0;
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virtual void visit(T10) = 0;
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virtual void visit(T11) = 0;
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virtual void visit(T12) = 0;
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virtual void visit(T13) = 0;
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virtual void visit(T14) = 0;
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};
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//*****************************************************************
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/// The visitor base class for thirteen types.
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/// Derive visitors from this.
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///\ingroup visitor
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//*****************************************************************
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template <typename T1, typename T2, typename T3, typename T4,
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typename T5, typename T6, typename T7, typename T8,
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typename T9, typename T10, typename T11, typename T12,
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typename T13>
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class visitor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13> : public visitor_tag
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{
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public:
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virtual ~visitor() {}
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virtual void visit(T1) = 0;
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virtual void visit(T2) = 0;
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virtual void visit(T3) = 0;
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virtual void visit(T4) = 0;
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virtual void visit(T5) = 0;
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virtual void visit(T6) = 0;
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virtual void visit(T7) = 0;
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virtual void visit(T8) = 0;
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virtual void visit(T9) = 0;
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virtual void visit(T10) = 0;
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virtual void visit(T11) = 0;
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virtual void visit(T12) = 0;
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virtual void visit(T13) = 0;
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};
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//*****************************************************************
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/// The visitor base class for twelve types.
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/// Derive visitors from this.
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///\ingroup visitor
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//*****************************************************************
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template <typename T1, typename T2, typename T3, typename T4,
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typename T5, typename T6, typename T7, typename T8,
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typename T9, typename T10, typename T11, typename T12>
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class visitor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> : public visitor_tag
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{
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public:
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virtual ~visitor() {}
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virtual void visit(T1) = 0;
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virtual void visit(T2) = 0;
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virtual void visit(T3) = 0;
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virtual void visit(T4) = 0;
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virtual void visit(T5) = 0;
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virtual void visit(T6) = 0;
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virtual void visit(T7) = 0;
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virtual void visit(T8) = 0;
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virtual void visit(T9) = 0;
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virtual void visit(T10) = 0;
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virtual void visit(T11) = 0;
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virtual void visit(T12) = 0;
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};
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//*****************************************************************
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/// The visitor base class for eleven types.
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/// Derive visitors from this.
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///\ingroup visitor
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//*****************************************************************
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template <typename T1, typename T2, typename T3, typename T4,
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typename T5, typename T6, typename T7, typename T8,
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typename T9, typename T10, typename T11>
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class visitor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> : public visitor_tag
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{
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public:
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virtual ~visitor() {}
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virtual void visit(T1) = 0;
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virtual void visit(T2) = 0;
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virtual void visit(T3) = 0;
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virtual void visit(T4) = 0;
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virtual void visit(T5) = 0;
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virtual void visit(T6) = 0;
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virtual void visit(T7) = 0;
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virtual void visit(T8) = 0;
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virtual void visit(T9) = 0;
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virtual void visit(T10) = 0;
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virtual void visit(T11) = 0;
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};
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//*****************************************************************
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/// The visitor base class for ten types.
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/// Derive visitors from this.
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///\ingroup visitor
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//*****************************************************************
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template <typename T1, typename T2, typename T3, typename T4,
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typename T5, typename T6, typename T7, typename T8,
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typename T9, typename T10>
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class visitor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> : public visitor_tag
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{
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|
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;
|
||
|
|
};
|
||
|
|
|
||
|
|
//*****************************************************************
|
||
|
|
/// The visitor base class for nine types.
|
||
|
|
/// Derive visitors from this.
|
||
|
|
///\ingroup visitor
|
||
|
|
//*****************************************************************
|
||
|
|
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;
|
||
|
|
};
|
||
|
|
|
||
|
|
//*****************************************************************
|
||
|
|
/// The visitor base class for eight types.
|
||
|
|
/// Derive visitors from this.
|
||
|
|
///\ingroup visitor
|
||
|
|
//*****************************************************************
|
||
|
|
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;
|
||
|
|
};
|
||
|
|
|
||
|
|
//*****************************************************************
|
||
|
|
/// The visitor base class for seven types.
|
||
|
|
/// Derive visitors from this.
|
||
|
|
///\ingroup visitor
|
||
|
|
//*****************************************************************
|
||
|
|
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;
|
||
|
|
};
|
||
|
|
|
||
|
|
//*****************************************************************
|
||
|
|
/// The visitor base class for six types.
|
||
|
|
/// Derive visitors from this.
|
||
|
|
///\ingroup visitor
|
||
|
|
//*****************************************************************
|
||
|
|
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;
|
||
|
|
};
|
||
|
|
|
||
|
|
//*****************************************************************
|
||
|
|
/// The visitor base class for five types.
|
||
|
|
/// Derive visitors from this.
|
||
|
|
///\ingroup visitor
|
||
|
|
//*****************************************************************
|
||
|
|
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;
|
||
|
|
};
|
||
|
|
|
||
|
|
//*****************************************************************
|
||
|
|
/// The visitor base class for four types.
|
||
|
|
/// Derive visitors from this.
|
||
|
|
///\ingroup visitor
|
||
|
|
//*****************************************************************
|
||
|
|
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;
|
||
|
|
};
|
||
|
|
|
||
|
|
//*****************************************************************
|
||
|
|
/// The visitor base class for three types.
|
||
|
|
/// Derive visitors from this.
|
||
|
|
///\ingroup visitor
|
||
|
|
//*****************************************************************
|
||
|
|
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;
|
||
|
|
};
|
||
|
|
|
||
|
|
//*****************************************************************
|
||
|
|
/// The visitor base class for two types.
|
||
|
|
/// Derive visitors from this.
|
||
|
|
///\ingroup visitor
|
||
|
|
//*****************************************************************
|
||
|
|
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;
|
||
|
|
};
|
||
|
|
|
||
|
|
//*****************************************************************
|
||
|
|
/// The visitor base class for one type.
|
||
|
|
/// Derive visitors from this.
|
||
|
|
///\ingroup visitor
|
||
|
|
//*****************************************************************
|
||
|
|
template <typename T1>
|
||
|
|
class visitor<T1> : public visitor_tag
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
|
||
|
|
virtual ~visitor() {}
|
||
|
|
|
||
|
|
virtual void visit(T1) = 0;
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
//*****************************************************************
|
||
|
|
/// Is the type an etl::visitor?
|
||
|
|
///\ingroup visitor
|
||
|
|
//*****************************************************************
|
||
|
|
template <typename T>
|
||
|
|
struct is_visitor : public etl::bool_constant<etl::is_base_of<etl::visitor_tag, T>::value>
|
||
|
|
{
|
||
|
|
};
|
||
|
|
|
||
|
|
#if ETL_USING_CPP17
|
||
|
|
//*****************************************************************
|
||
|
|
/// Is the type an etl::visitor?
|
||
|
|
///\ingroup visitor
|
||
|
|
//*****************************************************************
|
||
|
|
template <typename T>
|
||
|
|
constexpr bool is_visitor_v = etl::is_visitor<T>::value;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|