Fix compile error when using clang with C++20.#145
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rapids-bot[bot] merged 2 commits intoNVIDIA:branch-25.08from Jun 26, 2025
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Fix compile error when using clang with C++20.#145rapids-bot[bot] merged 2 commits intoNVIDIA:branch-25.08from
clang with C++20.#145rapids-bot[bot] merged 2 commits intoNVIDIA:branch-25.08from
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The extents type of the left hand side of those assignment are `extents<i_t, FJ_MOVE_SIZE, raft::dynamic_extent>`. But the extents type created on the right hand side by `raft::make_extents<i_t>((i_t)FJ_MOVE_SIZE, (i_t)fj.pb_ptr->n_variables))` are `extents<int, dynamic_extents, dynamic_extents>`. The former is constructible from the latter, but the documentation specific that this conversion is *explicit*: "This constructor is explicit if `((Extents != std::dynamic_extent && OtherExtents == std::dynamic_extent) || ...)` is true" The above condition holds in our case: (`FJ_MOVE_SIZE != dynamic_extent && dynamic_extents == dynamic_extent)` for the first extent. This ctor being explicit translates to the ctor of the mdspan being explicit, so in C++20, when the compiler enforces explicitness, we need to give it the exact extents type.
aliceb-nv
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/ok to test 810cb78 |
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jieyibi
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Mar 26, 2026
The extents type of the left hand side of those assignment are `extents<i_t, FJ_MOVE_SIZE, raft::dynamic_extent>`. But the extents type created on the right hand side by `raft::make_extents<i_t>((i_t)FJ_MOVE_SIZE, (i_t)fj.pb_ptr->n_variables))` are `extents<int, dynamic_extents, dynamic_extents>`. The former is constructible from the latter, but the documentation specific that this conversion is *explicit*: "This constructor is explicit if `((Extents != std::dynamic_extent && OtherExtents == std::dynamic_extent) || ...)` is true" The above condition holds in our case: (`FJ_MOVE_SIZE != dynamic_extent && dynamic_extents == dynamic_extent)` for the first extent. This ctor being explicit translates to the ctor of the mdspan being explicit, so in C++20, when the compiler enforces explicitness, we need to give it the exact extents type. Authors: - Clement Courbet (https://github.com/legrosbuffle) - Alice Boucher (https://github.com/aliceb-nv) Approvers: - Hugo Linsenmaier (https://github.com/hlinsen) URL: NVIDIA#145
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The extents type of the left hand side of those assignment are
extents<i_t, FJ_MOVE_SIZE, raft::dynamic_extent>. But the extents type created on the right hand side byraft::make_extents<i_t>((i_t)FJ_MOVE_SIZE, (i_t)fj.pb_ptr->n_variables))areextents<int, dynamic_extents, dynamic_extents>.The former is constructible from the latter, but the documentation specific that this conversion is explicit:
"This constructor is explicit if
((Extents != std::dynamic_extent && OtherExtents == std::dynamic_extent) || ...)is true"The above condition holds in our case: (
FJ_MOVE_SIZE != dynamic_extent && dynamic_extents == dynamic_extent)for the first extent.This ctor being explicit translates to the ctor of the mdspan being explicit, so in C++20, when the compiler enforces explicitness, we need to give it the exact extents type.