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https://gitlab.kitware.com/vtk/vtk-m
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Enable copying invalid variants
There was a bug where if you attempted to copy a variant that was not valid (i.e. did not hold an object), a seg fault could happen. This has been changed to set the target variant to also be invalid.
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docs/changelog/copy-invalid-variant.md
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5
docs/changelog/copy-invalid-variant.md
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@ -0,0 +1,5 @@
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# Fix bug with copying invalid variants
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There was a bug where if you attempted to copy a `Variant` that was not
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valid (i.e. did not hold an object); a seg fault could happen. This has
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been changed to set the target variant to also be invalid.
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@ -431,6 +431,23 @@ void TestCastAndCall()
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VTKM_TEST_ASSERT(test_equal(result, TestValue(26, vtkm::FloatDefault{})));
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}
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void TestCopyInvalid()
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{
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std::cout << "Test copy invalid variant" << std::endl;
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using VariantType = vtkm::exec::internal::Variant<TypePlaceholder<0>, NonTrivial>;
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VariantType source;
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source.Reset();
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VariantType destination1(source);
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VTKM_TEST_ASSERT(!destination1.IsValid());
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VariantType destination2(TypePlaceholder<0>{});
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destination2 = source;
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VTKM_TEST_ASSERT(!destination2.IsValid());
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}
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struct CountConstructDestruct
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{
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vtkm::Id* Count;
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@ -577,6 +594,7 @@ void RunTest()
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TestTriviallyCopyable();
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TestGet();
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TestCastAndCall();
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TestCopyInvalid();
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TestCopyDestroy();
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TestEmplace();
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TestConstructDestruct();
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@ -256,21 +256,31 @@ struct VariantConstructorImpl<vtkm::VTK_M_NAMESPACE::internal::Variant<Ts...>,
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VTK_M_DEVICE VariantConstructorImpl(const VariantConstructorImpl& src) noexcept
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: VariantStorageImpl<Ts...>(vtkm::internal::NullType{})
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{
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src.CastAndCall(VariantCopyConstructFunctor{}, this->Storage);
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if (src.IsValid())
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{
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src.CastAndCall(VariantCopyConstructFunctor{}, this->Storage);
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}
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this->Index = src.Index;
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}
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VTK_M_DEVICE VariantConstructorImpl& operator=(const VariantConstructorImpl& src) noexcept
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{
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if (this->GetIndex() == src.GetIndex())
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if (src.IsValid())
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{
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src.CastAndCall(detail::VariantCopyFunctor{}, this->Storage);
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if (this->GetIndex() == src.GetIndex())
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{
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src.CastAndCall(detail::VariantCopyFunctor{}, this->Storage);
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}
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else
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{
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this->Reset();
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src.CastAndCall(detail::VariantCopyConstructFunctor{}, this->Storage);
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this->Index = src.Index;
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}
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}
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else
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{
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this->Reset();
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src.CastAndCall(detail::VariantCopyConstructFunctor{}, this->Storage);
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this->Index = src.Index;
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}
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return *this;
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}
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