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72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
3 weeks ago
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/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkRangeIterableTraits.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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#ifndef vtkRangeIterableTraits_h
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#define vtkRangeIterableTraits_h
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class vtkCollection;
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class vtkCompositeDataSet;
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class vtkDataObjectTree;
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namespace vtk
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{
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namespace detail
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{
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template <typename CollectionType>
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struct CollectionRange;
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struct CompositeDataSetRange;
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struct DataObjectTreeRange;
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//------------------------------------------------------------------------------
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// DeduceRangeType:
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// These function signatures define a mapping from an Iterable (e.g. vtkObject)
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// to a RangeType (e.g. the for-range iterable object).
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// They are not implemented, as only the signatures are important. Classes used
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// should only be forward declared in this header.
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// Since classes are only forward declared, the argument type should be const&
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// qualified, and the return type should be a reference.
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// vtkCollection subclasses --> CollectionRange
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template <typename CollectionType,
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typename = typename std::enable_if<std::is_base_of<vtkCollection, CollectionType>::value>::type>
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CollectionRange<CollectionType>& DeduceRangeType(const CollectionType&);
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// vtkCompositeDataSet --> CompositeDataSetRange
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CompositeDataSetRange& DeduceRangeType(const vtkCompositeDataSet&);
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// vtkDataObjectTree --> DataObjectTreeRange
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DataObjectTreeRange& DeduceRangeType(const vtkDataObjectTree&);
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// Traits class that defines a RangeType corresponding to the iterable range
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// type most appropriate for Iterable.
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template <typename Iterable>
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struct IterableTraits
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{
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private:
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using RangeTypeInternal = decltype(vtk::detail::DeduceRangeType(std::declval<Iterable>()));
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public:
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using RangeType = typename std::decay<RangeTypeInternal>::type;
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};
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}
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}
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#endif // vtkRangeIterableTraits_h
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// VTK-HeaderTest-Exclude: vtkRangeIterableTraits.h
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