mirror of
https://gitlab.kitware.com/vtk/vtk-m
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66 lines
2.3 KiB
C++
66 lines
2.3 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_exec_arg_ExecutionSignatureTagBase_h
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#define vtk_m_exec_arg_ExecutionSignatureTagBase_h
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#include <vtkm/StaticAssert.h>
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#include <vtkm/internal/ExportMacros.h>
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#include <type_traits>
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namespace vtkm
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{
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namespace exec
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{
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namespace arg
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{
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/// \brief The base class for all tags used in an \c ExecutionSignature.
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///
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/// If a new \c ExecutionSignature tag is created, it must be derived from this
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/// class in some way. This helps identify \c ExecutionSignature tags in the \c
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/// VTKM_IS_EXECUTION_SIGNATURE_TAG macro and allows checking the validity of
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/// an \c ExecutionSignature.
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///
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/// In addition to inheriting from this base class, an \c ExecutionSignature
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/// tag must define a \c static \c const \c vtkm::IdComponent named \c INDEX
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/// that points to a parameter in the \c ControlSignature and a \c typedef
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/// named \c AspectTag that defines the aspect of the fetch.
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///
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struct ExecutionSignatureTagBase
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{
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};
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namespace internal
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{
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template <typename ExecutionSignatureTag>
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struct ExecutionSignatureTagCheck
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{
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static constexpr bool Valid =
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std::is_base_of<vtkm::exec::arg::ExecutionSignatureTagBase, ExecutionSignatureTag>::value;
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};
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} // namespace internal
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/// Checks that the argument is a proper tag for an \c ExecutionSignature. This
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/// is a handy concept check when modifying tags or dispatching to make sure
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/// that a template argument is actually an \c ExecutionSignature tag. (You can
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/// get weird errors elsewhere in the code when a mistake is made.)
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///
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#define VTKM_IS_EXECUTION_SIGNATURE_TAG(tag) \
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VTKM_STATIC_ASSERT_MSG(::vtkm::exec::arg::internal::ExecutionSignatureTagCheck<tag>::Valid, \
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"Provided a type that is not a valid ExecutionSignature tag.")
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}
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}
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} // namespace vtkm::exec::arg
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#endif //vtk_m_exec_arg_ExecutionSignatureTagBase_h
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