mirror of
https://gitlab.kitware.com/vtk/vtk-m
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3c07c77fa7
This reduces the number of weak vtables vtkm generates, resulting in a reduction of binary sizes for projects that include vtkm classes in multiple translation units.
83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt 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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// Copyright 2014 Sandia Corporation.
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// Copyright 2014 UT-Battelle, LLC.
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// Copyright 2014 Los Alamos National Security.
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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//============================================================================
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#ifndef vtk_m_cont_internal_SimplePolymorphicContainer_h
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#define vtk_m_cont_internal_SimplePolymorphicContainer_h
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#include <vtkm/cont/vtkm_cont_export.h>
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#include <vtkm/Types.h>
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#include <memory>
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namespace vtkm {
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namespace cont {
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namespace internal {
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/// \brief Base class for SimplePolymorphicContainer
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///
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struct VTKM_CONT_EXPORT SimplePolymorphicContainerBase {
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SimplePolymorphicContainerBase();
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// This must exist so that subclasses are destroyed correctly.
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virtual ~SimplePolymorphicContainerBase();
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virtual std::shared_ptr<SimplePolymorphicContainerBase>
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NewInstance() const = 0;
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virtual const void *GetVoidPointer() const = 0;
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};
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/// \brief Simple object container that can use C++ run-time type information.
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///
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/// The SimplePolymorphicContainer is a trivial structure that contains a
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/// single object. The intention is to be able to pass around a pointer to the
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/// superclass SimplePolymorphicContainerBase to methods that cannot know the
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/// full type of the object at run-time. This is roughly equivalent to passing
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/// around a void* except that C++ will capture run-time type information that
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/// allows for safer dynamic downcasts.
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///
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template<typename T>
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struct VTKM_ALWAYS_EXPORT SimplePolymorphicContainer : public SimplePolymorphicContainerBase
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{
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T Item;
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VTKM_CONT
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SimplePolymorphicContainer() : Item() { }
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VTKM_CONT
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SimplePolymorphicContainer(const T &src) : Item(src) { }
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virtual std::shared_ptr<SimplePolymorphicContainerBase> NewInstance() const
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{
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return std::shared_ptr<SimplePolymorphicContainerBase>(
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new SimplePolymorphicContainer<T>());
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}
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virtual const void *GetVoidPointer() const
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{
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return &this->Item;
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}
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};
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}
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}
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} // namespace vtkm::cont::internal
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#endif //vtk_m_cont_internal_SimplePolymorphicContainer_h
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