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authorDaniel Wilhelm <daniel@wili.li>2014-04-18 17:15:16 +0200
committerDaniel Wilhelm <daniel@wili.li>2014-04-18 17:15:16 +0200
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-////////////////////////////////////////////////////////////////////////////////
-// The Loki Library
-// Copyright (c) 2001 by Andrei Alexandrescu
-// This code accompanies the book:
-// Alexandrescu, Andrei. "Modern C++ Design: Generic Programming and Design
-// Patterns Applied". Copyright (c) 2001. Addison-Wesley.
-// Permission to use, copy, modify, distribute and sell this software for any
-// purpose is hereby granted without fee, provided that the above copyright
-// notice appear in all copies and that both that copyright notice and this
-// permission notice appear in supporting documentation.
-// The author or Addison-Wesley Longman make no representations about the
-// suitability of this software for any purpose. It is provided "as is"
-// without express or implied warranty.
-////////////////////////////////////////////////////////////////////////////////
-#ifndef LOKI_HIERARCHYGENERATORS_INC_
-#define LOKI_HIERARCHYGENERATORS_INC_
-
-// $Id: HierarchyGenerators.h 751 2006-10-17 19:50:37Z syntheticpp $
-
-
-#include "Typelist.h"
-#include "TypeTraits.h"
-#include "EmptyType.h"
-
-namespace Loki
-{
-#if defined(_MSC_VER) && _MSC_VER >= 1300
-#pragma warning( push )
-// 'class1' : base-class 'class2' is already a base-class of 'class3'
-#pragma warning( disable : 4584 )
-#endif // _MSC_VER
-
-////////////////////////////////////////////////////////////////////////////////
-// class template GenScatterHierarchy
-// Generates a scattered hierarchy starting from a typelist and a template
-// Invocation (TList is a typelist, Unit is a template of one arg):
-// GenScatterHierarchy<TList, Unit>
-// The generated class inherits all classes generated by instantiating the
-// template 'Unit' with the types contained in TList
-////////////////////////////////////////////////////////////////////////////////
-
-namespace Private
-{
-// The following type helps to overcome subtle flaw in the original
-// implementation of GenScatterHierarchy.
-// The flaw is revealed when the input type list of GenScatterHierarchy
-// contains more then one element of the same type (e.g. LOKI_TYPELIST_2(int, int)).
-// In this case GenScatterHierarchy will contain multiple bases of the same
-// type and some of them will not be reachable (per 10.3).
-// For example before the fix the first element of Tuple<LOKI_TYPELIST_2(int, int)>
-// is not reachable in any way!
-template<class, class>
-struct ScatterHierarchyTag;
-}
-
-template <class TList, template <class> class Unit>
-class GenScatterHierarchy;
-
-template <class T1, class T2, template <class> class Unit>
-class GenScatterHierarchy<Typelist<T1, T2>, Unit>
- : public GenScatterHierarchy<Private::ScatterHierarchyTag<T1, T2>, Unit>
- , public GenScatterHierarchy<T2, Unit>
-{
-public:
- typedef Typelist<T1, T2> TList;
- // Insure that LeftBase is unique and therefore reachable
- typedef GenScatterHierarchy<Private::ScatterHierarchyTag<T1, T2>, Unit> LeftBase;
- typedef GenScatterHierarchy<T2, Unit> RightBase;
- template <typename T> struct Rebind
- {
- typedef Unit<T> Result;
- };
-};
-
-// In the middle *unique* class that resolve possible ambiguity
-template <class T1, class T2, template <class> class Unit>
-class GenScatterHierarchy<Private::ScatterHierarchyTag<T1, T2>, Unit>
- : public GenScatterHierarchy<T1, Unit>
-{
-};
-
-template <class AtomicType, template <class> class Unit>
-class GenScatterHierarchy : public Unit<AtomicType>
-{
- typedef Unit<AtomicType> LeftBase;
- template <typename T> struct Rebind
- {
- typedef Unit<T> Result;
- };
-};
-
-template <template <class> class Unit>
-class GenScatterHierarchy<NullType, Unit>
-{
- template <typename T> struct Rebind
- {
- typedef Unit<T> Result;
- };
-};
-
-////////////////////////////////////////////////////////////////////////////////
-// function template Field
-// Accesses a field in an object of a type generated with GenScatterHierarchy
-// Invocation (obj is an object of a type H generated with GenScatterHierarchy,
-// T is a type in the typelist used to generate H):
-// Field<T>(obj)
-// returns a reference to Unit<T>, where Unit is the template used to generate H
-////////////////////////////////////////////////////////////////////////////////
-
-template <class T, class H>
-typename H::template Rebind<T>::Result& Field(H& obj)
-{
- return obj;
-}
-
-template <class T, class H>
-const typename H::template Rebind<T>::Result& Field(const H& obj)
-{
- return obj;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// function template TupleUnit
-// The building block of tuples
-////////////////////////////////////////////////////////////////////////////////
-
-template <class T>
-struct TupleUnit
-{
- T value_;
- operator T& () { return value_; }
- operator const T& () const { return value_; }
-};
-
-////////////////////////////////////////////////////////////////////////////////
-// class template Tuple
-// Implements a tuple class that holds a number of values and provides field
-// access to them via the Field function (below)
-////////////////////////////////////////////////////////////////////////////////
-
-template <class TList>
-struct Tuple : public GenScatterHierarchy<TList, TupleUnit>
-{
-};
-
-////////////////////////////////////////////////////////////////////////////////
-// helper class template FieldHelper
-// See Field below
-////////////////////////////////////////////////////////////////////////////////
-
-template <class H, unsigned int i> struct FieldHelper;
-
-template <class H>
-struct FieldHelper<H, 0>
-{
- typedef typename H::TList::Head ElementType;
- typedef typename H::template Rebind<ElementType>::Result UnitType;
-
- enum
- {
- isTuple = Conversion<UnitType, TupleUnit<ElementType> >::sameType,
- isConst = TypeTraits<H>::isConst
- };
-
- typedef const typename H::LeftBase ConstLeftBase;
-
- typedef typename Select < isConst, ConstLeftBase,
- typename H::LeftBase >::Result LeftBase;
-
- typedef typename Select < isTuple, ElementType,
- UnitType >::Result UnqualifiedResultType;
-
- typedef typename Select < isConst, const UnqualifiedResultType,
- UnqualifiedResultType >::Result ResultType;
-
- static ResultType& Do(H& obj)
- {
- LeftBase& leftBase = obj;
- return leftBase;
- }
-};
-
-template <class H, unsigned int i>
-struct FieldHelper
-{
- typedef typename TL::TypeAt<typename H::TList, i>::Result ElementType;
- typedef typename H::template Rebind<ElementType>::Result UnitType;
-
- enum
- {
- isTuple = Conversion<UnitType, TupleUnit<ElementType> >::sameType,
- isConst = TypeTraits<H>::isConst
- };
-
- typedef const typename H::RightBase ConstRightBase;
-
- typedef typename Select < isConst, ConstRightBase,
- typename H::RightBase >::Result RightBase;
-
- typedef typename Select < isTuple, ElementType,
- UnitType >::Result UnqualifiedResultType;
-
- typedef typename Select < isConst, const UnqualifiedResultType,
- UnqualifiedResultType >::Result ResultType;
-
- static ResultType& Do(H& obj)
- {
- RightBase& rightBase = obj;
- return FieldHelper < RightBase, i - 1 >::Do(rightBase);
- }
-};
-
-////////////////////////////////////////////////////////////////////////////////
-// function template Field
-// Accesses a field in an object of a type generated with GenScatterHierarchy
-// Invocation (obj is an object of a type H generated with GenScatterHierarchy,
-// i is the index of a type in the typelist used to generate H):
-// Field<i>(obj)
-// returns a reference to Unit<T>, where Unit is the template used to generate H
-// and T is the i-th type in the typelist
-////////////////////////////////////////////////////////////////////////////////
-
-template <int i, class H>
-typename FieldHelper<H, i>::ResultType&
-Field(H& obj)
-{
- return FieldHelper<H, i>::Do(obj);
-}
-
-// template <int i, class H>
-// const typename FieldHelper<H, i>::ResultType&
-// Field(const H& obj)
-// {
-// return FieldHelper<H, i>::Do(obj);
-// }
-
-////////////////////////////////////////////////////////////////////////////////
-// class template GenLinearHierarchy
-// Generates a linear hierarchy starting from a typelist and a template
-// Invocation (TList is a typelist, Unit is a template of two args):
-// GenScatterHierarchy<TList, Unit>
-////////////////////////////////////////////////////////////////////////////////
-
-template
-<
-class TList,
- template <class AtomicType, class Base> class Unit,
- class Root = EmptyType
- >
-class GenLinearHierarchy;
-
-template
-<
-class T1,
- class T2,
- template <class, class> class Unit,
- class Root
- >
-class GenLinearHierarchy<Typelist<T1, T2>, Unit, Root>
- : public Unit< T1, GenLinearHierarchy<T2, Unit, Root> >
-{
-};
-
-template
-<
-class T,
- template <class, class> class Unit,
- class Root
- >
-class GenLinearHierarchy<Typelist<T, NullType>, Unit, Root>
- : public Unit<T, Root>
-{
-};
-
-template
-<
-template <class, class> class Unit,
- class Root
- >
-class GenLinearHierarchy<NullType , Unit, Root>
- : public Root // is this better: Unit<NullType, Root> ?
-{
-};
-
-#if defined(_MSC_VER) && _MSC_VER >= 1300
-#pragma warning( pop )
-#endif
-} // namespace Loki
-
-#endif // end file guardian
-
bgstack15