tmp/tmpxfeca5n6/{from.md → to.md}
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| 1 |
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#### Mandates <a id="linalg.helpers.mandates">[[linalg.helpers.mandates]]</a>
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[*Note 1*: These exposition-only helper functions use the less
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constraining input concepts even for the output arguments, because the
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additional constraint for assignability of elements is not necessary,
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and they are sometimes used in a context where the third argument is an
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input type too. — *end note*]
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``` cpp
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template<class MDS1, class MDS2>
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requires(is-mdspan<MDS1> && is-mdspan<MDS2>)
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constexpr
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bool compatible-static-extents(size_t r1, size_t r2) { // exposition only
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return MDS1::static_extent(r1) == dynamic_extent ||
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MDS2::static_extent(r2) == dynamic_extent ||
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MDS1::static_extent(r1) == MDS2::static_extent(r2);
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}
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template<in-vector In1, in-vector In2, in-vector Out>
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constexpr bool possibly-addable() { // exposition only
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return compatible-static-extents<Out, In1>(0, 0) &&
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compatible-static-extents<Out, In2>(0, 0) &&
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compatible-static-extents<In1, In2>(0, 0);
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}
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template<in-matrix In1, in-matrix In2, in-matrix Out>
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constexpr bool possibly-addable() { // exposition only
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return compatible-static-extents<Out, In1>(0, 0) &&
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compatible-static-extents<Out, In1>(1, 1) &&
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compatible-static-extents<Out, In2>(0, 0) &&
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compatible-static-extents<Out, In2>(1, 1) &&
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compatible-static-extents<In1, In2>(0, 0) &&
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compatible-static-extents<In1, In2>(1, 1);
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}
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template<in-matrix InMat, in-vector InVec, in-vector OutVec>
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constexpr bool possibly-multipliable() { // exposition only
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return compatible-static-extents<OutVec, InMat>(0, 0) &&
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compatible-static-extents<InMat, InVec>(1, 0);
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}
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template<in-vector InVec, in-matrix InMat, in-vector OutVec>
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constexpr bool possibly-multipliable() { // exposition only
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return compatible-static-extents<OutVec, InMat>(0, 1) &&
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compatible-static-extents<InMat, InVec>(0, 0);
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}
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template<in-matrix InMat1, in-matrix InMat2, in-matrix OutMat>
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constexpr bool possibly-multipliable() { // exposition only
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return compatible-static-extents<OutMat, InMat1>(0, 0) &&
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compatible-static-extents<OutMat, InMat2>(1, 1) &&
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compatible-static-extents<InMat1, InMat2>(1, 0);
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}
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```
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