GH-39333: [C++] Don't use "if constexpr" in lambda #39334
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@github-actions crossbow submit wheel-windows-* |
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It seems that it's not portable. At least it doesn't work as expected
with Visual Studio 2017:
C:/arrow/cpp/src/arrow/array/array_nested.cc(291): error C2065: 'validity': undeclared identifier (compiling source file C:\arrow-build\src\arrow\CMakeFiles\arrow_shared.dir\Unity\unity_0_cxx.cxx) [C:\arrow-build\src\arrow\arrow_shared.vcxproj]
C:/arrow/cpp/src/arrow/array/array_nested.cc(660): note: see reference to function template instantiation 'arrow::Result<std::shared_ptr<arrow::Array>> arrow::`anonymous-namespace'::FlattenListViewArray<arrow::ListViewArray,false>(const ListViewArrayT &,arrow::MemoryPool *)' being compiled
with
[
ListViewArrayT=arrow::ListViewArray
] (compiling source file C:\arrow-build\src\arrow\CMakeFiles\arrow_shared.dir\Unity\unity_0_cxx.cxx)
memory_pool.cc
C:/arrow/cpp/src/arrow/array/array_nested.cc(291): error C2065: 'list_view_array_offset': undeclared identifier (compiling source file C:\arrow-build\src\arrow\CMakeFiles\arrow_shared.dir\Unity\unity_0_cxx.cxx) [C:\arrow-build\src\arrow\arrow_shared.vcxproj]
Use "if constexpr" in outer lambda.
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@github-actions crossbow submit wheel-windows-* |
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Revision: 47ed583 Submitted crossbow builds: ursacomputing/crossbow @ actions-516f35e778
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@felipecrv This is happen after #35345 is merged. |
pitrou
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Dec 21, 2023
cpp/src/arrow/array/array_nested.cc
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| auto is_null_or_empty = [&](int64_t i) { | ||
| if constexpr (HasNulls) { | ||
| std::function<bool(int64_t)> is_null_or_empty; |
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This is complicated. Instead, how about just:
auto is_null_or_empty = [&](int64_t i) {
if (HasNulls && !bit_util::GetBit(validity, list_view_array_offset + i)) {
return true;
}
return sizes[i] == 0;
};
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+1.
The compiler will constant-fold it when the lambda gets inlined. Putting it in std::function would prevent inlining.
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@github-actions crossbow submit -g cpp wheel-windows-* |
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Revision: e2ee3d3 Submitted crossbow builds: ursacomputing/crossbow @ actions-0dda7a7461
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After merging your PR, Conbench analyzed the 5 benchmarking runs that have been run so far on merge-commit 5df541d. There were no benchmark performance regressions. 🎉 The full Conbench report has more details. It also includes information about 7 possible false positives for unstable benchmarks that are known to sometimes produce them. |
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### Rationale for this change
It seems that it's not portable. At least it doesn't work as expected with Visual Studio 2017:
C:/arrow/cpp/src/arrow/array/array_nested.cc(291): error C2065: 'validity': undeclared identifier (compiling source file C:\arrow-build\src\arrow\CMakeFiles\arrow_shared.dir\Unity\unity_0_cxx.cxx) [C:\arrow-build\src\arrow\arrow_shared.vcxproj]
C:/arrow/cpp/src/arrow/array/array_nested.cc(660): note: see reference to function template instantiation 'arrow::Result<std::shared_ptr<arrow::Array>> arrow::`anonymous-namespace'::FlattenListViewArray<arrow::ListViewArray,false>(const ListViewArrayT &,arrow::MemoryPool *)' being compiled
with
[
ListViewArrayT=arrow::ListViewArray
] (compiling source file C:\arrow-build\src\arrow\CMakeFiles\arrow_shared.dir\Unity\unity_0_cxx.cxx)
memory_pool.cc
C:/arrow/cpp/src/arrow/array/array_nested.cc(291): error C2065: 'list_view_array_offset': undeclared identifier (compiling source file C:\arrow-build\src\arrow\CMakeFiles\arrow_shared.dir\Unity\unity_0_cxx.cxx) [C:\arrow-build\src\arrow\arrow_shared.vcxproj]
### What changes are included in this PR?
Avoid "if constexpr" in lambda.
### Are these changes tested?
Yes.
### Are there any user-facing changes?
No.
* Closes: apache#39333
Lead-authored-by: Antoine Pitrou <antoine@python.org>
Co-authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>
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Rationale for this change
It seems that it's not portable. At least it doesn't work as expected with Visual Studio 2017:
What changes are included in this PR?
Avoid "if constexpr" in lambda.
Are these changes tested?
Yes.
Are there any user-facing changes?
No.