22<feed xmlns =" http://www.w3.org/2005/Atom"
33 <title >cpprefjp - C++日本語リファレンス</title >
44 <link href =" https://cpprefjp.github.io"
5- <updated >2024-12-19T04:52:07.531371 </updated >
6- <id >d35f6480-75bc-406d-8060-0d5dd8f5380b </id >
5+ <updated >2024-12-19T08:00:20.169462 </updated >
6+ <id >a2118247-a8b2-44bb-affe-3d8d2bd549c0 </id >
77
88
9+ <entry >
10+ <title >transposed -- linalg/tranposed: P3222R0対応(#1382)</title >
11+ <link href =" https://cpprefjp.github.io/reference/linalg/transposed.html"
12+ <id >abcc16f33101ad97d56f80892f7496f956f3c43b:reference/linalg/transposed.md</id >
13+ <updated >2024-12-19T16:56:49+09:00</updated >
14+
15+ <summary type =" html" < pre>< code> diff --git a/reference/linalg/transposed.md b/reference/linalg/transposed.md
16+ index dec56c1af..f03034f6c 100644
17+ --- a/reference/linalg/transposed.md
18+ +++ b/reference/linalg/transposed.md
19+ @@ -30,6 +30,8 @@ namespace std::linalg {
20+
21+ - `Layout`が[`layout_left`](/reference/mdspan/layout_left.md)のとき、[`layout_right`](/reference/mdspan/layout_right.md)
22+ - `Layout`が[`layout_right`](/reference/mdspan/layout_right.md)のとき、[`layout_left`](/reference/mdspan/layout_left.md)
23+ +- `Layout`が[`layout_left_padded& lt;PaddingValue& gt;`](/reference/mdspan/layout_left_padded.md)のとき、[`layout_right_padded& lt;PaddingValue& gt;`](/reference/mdspan/layout_right_padded.md)
24+ +- `Layout`が[`layout_right_padded& lt;PaddingValue& gt;`](/reference/mdspan/layout_right_padded.md)のとき、[`layout_left_padded& lt;PaddingValue& gt;`](/reference/mdspan/layout_left_padded.md)
25+ - `Layout`が[`layout_stride`](/reference/mdspan/layout_stride.md)のとき、`layout_stride`
26+ - `Layout`が[`layout_blas_packed`](layout_blas_packed.md)`& lt;Triangle, StorageOrder& gt;`のとき、`layout_blas_packed& lt;OppositeTriangle, OppositeStorageOrder& gt;`
27+ - `OppositeTriangle`は[`conditional_t`](/reference/type_traits/conditional.md)`& lt;`[`is_same_v`](/reference/type_traits/is_same.md)`& lt;Triangle, upper_triangle_t& gt;, lower_triangle_t, upper_triangle_t& gt;`
28+ @@ -48,7 +50,25 @@ namespace std::linalg {
29+ ```
30+ * transpose-extents[link layout_transpose/transpose-extents.md]
31+
32+ -- `Layout`が[`layout_stride`](/reference/mdspan/layout_stride.md)の特殊化であるとき、
33+ +- `Layout`が[`layout_left_padded& lt;PaddingValue& gt;`](/reference/mdspan/layout_left_padded.md)であるとき、
34+ +
35+ + ```cpp
36+ + R(a.data_handle(),
37+ + ReturnMapping(transpose-extents(a.mapping().extents()), a.mapping().stride(1)),
38+ + a.accessor())
39+ + ```
40+ + * transpose-extents[link layout_transpose/transpose-extents.md]
41+ +
42+ +- `Layout`が[`layout_right_padded& lt;PaddingValue& gt;`](/reference/mdspan/layout_right_padded.md)であるとき、
43+ +
44+ + ```cpp
45+ + R(a.data_handle(),
46+ + ReturnMapping(transpose-extents(a.mapping().extents()), a.mapping().stride(0)),
47+ + a.accessor())
48+ + ```
49+ + * transpose-extents[link layout_transpose/transpose-extents.md]
50+ +
51+ +- `Layout`が[`layout_stride`](/reference/mdspan/layout_stride.md)であるとき、
52+
53+ ```cpp
54+ R(a.data_handle(),
55+ @@ -122,3 +142,4 @@ int main()
56+ ## 参照
57+ - [P1673R13 A free function linear algebra interface based on the BLAS](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p1673r13.html)
58+ - [P1674R2: Evolving a Standard C++ Linear Algebra Library from the BLAS](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p1674r2.html)
59+ +- [P3222R0 Fix C++26 by adding transposed special cases for P2642 layouts](https://open-std.org/jtc1/sc22/wg21/docs/papers/2024/p3222r0.html)
60+ < /code>< /pre> </summary >
61+
62+ <author >
63+ <name >yoh</name >
64+ 65+ </author >
66+ </entry >
67+
968 <entry >
1069 <title >コンパイラの実装状況 -- C++26: 2024-12 mailingの変更を記載 #1371</title >
1170 <link href =" https://cpprefjp.github.io/implementation-status.html"
@@ -3507,98 +3566,4 @@ C++ の標準規格は、他にも各国の規格化団体によって国際標
35073566 </author >
35083567 </entry >
35093568
3510- <entry >
3511- <title >gcd -- gcd, lcmの実装例 : 仕様に合わせて絶対値をとるよう修正</title >
3512- <link href =" https://cpprefjp.github.io/reference/numeric/gcd.html"
3513- <id >5cc3b9e41da3334156c0090b216b916c8804af7c:reference/numeric/gcd.md</id >
3514- <updated >2024-12-18T22:28:05+09:00</updated >
3515-
3516- <summary type =" html" < pre>< code> diff --git a/reference/numeric/gcd.md b/reference/numeric/gcd.md
3517- index 5bf7c51aa..3a5754232 100644
3518- --- a/reference/numeric/gcd.md
3519- +++ b/reference/numeric/gcd.md
3520- @@ -176,14 +176,19 @@ constexpr std::common_type_t& lt;M, N& gt; gcd(M m, N n) {
3521- if (m == 0 & amp;& amp; n == 0) {
3522- return 0;
3523- }
3524- - while (m != 0 & amp;& amp; n != 0) {
3525- - if (m & gt; n) {
3526- - m %= n;
3527- +
3528- + auto mm = abs(m);
3529- + auto nn = abs(n);
3530- + while (mm != 0 & amp;& amp; nn != 0) {
3531- + if (mm & gt; nn) {
3532- + mm %= nn;
3533- }
3534- else {
3535- - n %= m;
3536- + nn %= mm;
3537- }
3538- }
3539- - return m & lt; n ? n : m;
3540- + return mm & lt; nn ? nn : mm;
3541- }
3542- ```
3543- +* abs[link /reference/cstdlib/abs.md]
3544- +
3545- < /code>< /pre> </summary >
3546-
3547- <author >
3548- <name >Akira Takahashi</name >
3549- 3550- </author >
3551- </entry >
3552-
3553- <entry >
3554- <title >lcm -- gcd, lcmの実装例 : 仕様に合わせて絶対値をとるよう修正</title >
3555- <link href =" https://cpprefjp.github.io/reference/numeric/lcm.html"
3556- <id >5cc3b9e41da3334156c0090b216b916c8804af7c:reference/numeric/lcm.md</id >
3557- <updated >2024-12-18T22:28:05+09:00</updated >
3558-
3559- <summary type =" html" < pre>< code> diff --git a/reference/numeric/lcm.md b/reference/numeric/lcm.md
3560- index cdea96876..fbab46a02 100644
3561- --- a/reference/numeric/lcm.md
3562- +++ b/reference/numeric/lcm.md
3563- @@ -178,19 +178,24 @@ constexpr std::common_type_t& lt;M, N& gt; gcd(M m, N n) {
3564- if (m == 0 & amp;& amp; n == 0) {
3565- return 0;
3566- }
3567- - while (m != 0 & amp;& amp; n != 0) {
3568- - if (m & gt; n) {
3569- - m %= n;
3570- +
3571- + auto mm = abs(m);
3572- + auto nn = abs(n);
3573- + while (mm != 0 & amp;& amp; nn != 0) {
3574- + if (mm & gt; nn) {
3575- + mm %= nn;
3576- }
3577- else {
3578- - n %= m;
3579- + nn %= mm;
3580- }
3581- }
3582- - return m & lt; n ? n : m;
3583- + return mm & lt; nn ? nn : mm;
3584- }
3585-
3586- template & lt;class M, class N& gt;
3587- constexpr std::common_type_t& lt;M, N& gt; lcm(M m, N n) {
3588- - return m / gcd(m, n) * n;
3589- + return abs(m) / gcd(m, n) * abs(n);
3590- }
3591- -```
3592- \ No newline at end of file
3593- +```
3594- +* abs[link /reference/cstdlib/abs.md]
3595- +
3596- < /code>< /pre> </summary >
3597-
3598- <author >
3599- <name >Akira Takahashi</name >
3600- 3601- </author >
3602- </entry >
3603-
36043569</feed >
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