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https://gitlab.kitware.com/vtk/vtk-m
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7811cc4b1e
Many of the fancy `ArrayHandle`s are read-only and therefore connot really create write portals. Likewise, many `ArrayHandle`s (both read- only and read/write) have no way to resize themselves. In this case, implementing the `CreateWritePortal` and `ResizeBuffers` methods in the `Storage` class was troublesome. Mostly they just threw an exception, but they also sometimes had to deal with cases where the behavior was allowed. To simplify code for developers, this introduces a pair of macros: `VTKM_STORAGE_NO_RESIZE` and `VTKM_STORAGE_NO_WRITE_PORTAL`. These can be declared in a `Storage` implementation when the storage has no viable way to resize itself and create a write portal, respectively. Having boilerplate code for these methods also helps work around expected behavior for `ResizeBuffers`. `ResizeBuffers` should silently work when resizing to the same size. Also `ResizeBuffers` should behave well when resizing to 0 as that is what `ReleaseResources` does.
42 lines
1.2 KiB
C++
42 lines
1.2 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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//
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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 vtk_m_internal_ArrayPortalDummy
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#define vtk_m_internal_ArrayPortalDummy
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#include <vtkm/Assert.h>
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#include <vtkm/Types.h>
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namespace vtkm
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{
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namespace internal
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{
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/// A class that can be used in place of an `ArrayPortal` when the `ArrayPortal` is
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/// not actually supported. It allows templates to be compiled, but will cause undefined
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/// behavior if actually used.
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template <typename T>
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struct ArrayPortalDummy
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{
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using ValueType = T;
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VTKM_EXEC_CONT vtkm::Id GetNumberOfValues() const { return 0; }
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VTKM_EXEC_CONT ValueType Get(vtkm::Id) const
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{
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VTKM_ASSERT(false && "Tried to use a dummy portal.");
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return ValueType{};
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}
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};
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}
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} // namespace vtkm::internal
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#endif //vtk_m_internal_ArrayPortalDummy
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