Commit fd102a30 authored by Robert Maynard's avatar Robert Maynard Committed by Vicente Bolea
Browse files

83d4d4e4 ArrayPortalToIterators now compiles with GCC-4.X


Acked-by: Kitware Robot's avatarKitware Robot <kwrobot@kitware.com>
Merge-request: !1934
parent 4de6338c
......@@ -13,6 +13,31 @@
#include <vtkm/cont/ArrayPortal.h>
#include <vtkm/cont/internal/IteratorFromArrayPortal.h>
namespace vtkmstd
{
/// Implementation of std::void_t (C++17):
/// Allows for specialization of class templates based on members of template
/// parameters.
#if defined(VTKM_GCC) && (__GNUC__ < 5)
// Due to a defect in the wording (CWG 1558) unused parameters in alias templates
// were not guaranteed to ensure SFINAE, and therefore would consider everything
// to match the 'true' side. For VTK-m the only known compiler that implemented
// this defect is GCC < 5.
template <class... T>
struct void_pack
{
using type = void;
};
template <class... T>
using void_t = typename void_pack<T...>::type;
#else
template <typename...>
using void_t = void;
#endif
} // end namespace vtkmstd
namespace vtkm
{
namespace cont
......
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