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95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
3 weeks ago
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/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkMeta.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 vtkMeta_h
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#define vtkMeta_h
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#include <type_traits>
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#include <utility>
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/**
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* @file vtkMeta
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* This file contains a variety of metaprogramming constructs for working
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* with vtk types.
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*/
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// Forward decs for StripPointers:
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template <typename ArrayType>
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class vtkNew;
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template <typename ArrayType>
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class vtkSmartPointer;
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template <typename ArrayType>
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class vtkWeakPointer;
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namespace vtk
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{
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namespace detail
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{
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//------------------------------------------------------------------------------
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// Strip vtkNew, vtkSmartPointer, etc from a type.
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template <typename T>
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struct StripPointers
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{
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using type = T;
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};
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template <typename T>
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struct StripPointers<T*>
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{
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using type = T;
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};
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template <typename ArrayType>
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struct StripPointers<vtkNew<ArrayType> >
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{
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using type = ArrayType;
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};
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template <typename ArrayType>
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struct StripPointers<vtkSmartPointer<ArrayType> >
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{
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using type = ArrayType;
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};
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template <typename ArrayType>
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struct StripPointers<vtkWeakPointer<ArrayType> >
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{
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using type = ArrayType;
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};
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//------------------------------------------------------------------------------
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// Test if a type is defined (true) or just forward declared (false).
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template <typename T>
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struct IsComplete
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{
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private:
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// Can't take the sizeof an incomplete class.
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template <typename U, std::size_t = sizeof(U)>
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static std::true_type impl(U*);
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static std::false_type impl(...);
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using bool_constant = decltype(impl(std::declval<T*>()));
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public:
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static constexpr bool value = bool_constant::value;
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};
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}
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} // end namespace vtk::detail
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#endif // vtkMeta_h
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// VTK-HeaderTest-Exclude: vtkMeta.h
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