<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/64702>64702</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            some error in  operator= in valarray
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          hutoushayu
      </td>
    </tr>
</table>

<pre>
    In the case，indirect_array  temp1 temp2 create from same valarry，  “temp1 = temp2;”  well get error result。
It's the same in  mask_array ， gslice_array ，slice_array ，indirect_array。

`#include <iostream>
#include <valarray>

#define MYSIZE(v)               (sizeof(v)/sizeof(v[0]))

using namespace std;

void
test()
{
  int input[] = { 0, 1, 2, 3, 4, 5, 6 };
  std::valarray<int>  filled(input, MYSIZE(input));
  printf("filled: %d, %d, %d, %d, %d, %d, %d\n",filled[0],filled[1],filled[2],filled[3],filled[4],filled[5],filled[6]);

  size_t                          indexes1[] = { 1, 3, 4, 6 };
  std::valarray<size_t>           index1(indexes1, MYSIZE(indexes1));
  size_t                          indexes2[] = { 1, 2, 3, 4 };
  std::valarray<size_t>           index2(indexes2, MYSIZE(indexes2));

  const std::indirect_array<int>    temp1 = filled[index1];
  const std::indirect_array<int>    temp2 = filled[index2];

  std::valarray<int>                out1(temp1);
  printf("temp1 : %d, %d, %d, %d\n",out1[0],out1[1],out1[2],out1[3]);
  std::valarray<int>                out2(temp2);
  printf("temp2 : %d, %d, %d, %d\n",out2[0],out2[1],out2[2],out2[3]);

  // check here
  temp1 = temp2;

  printf("changed:\n");
  std::valarray<int>                ans(temp1);
  printf("temp1 : %d, %d, %d, %d\n",ans[0],ans[1],ans[2],ans[3]);
  printf("filled: %d, %d, %d, %d, %d, %d, %d\n",filled[0],filled[1],filled[2],filled[3],filled[4],filled[5],filled[6]);
}


int main()
{
  test();
}`


I think the code in libcxx/include/valarray  is wrong.
if both sides of the equal sign create from same valarry, __vp_ and __s well operation memory at same time.

`template <class _Tp>
inline
const indirect_array<_Tp>&
indirect_array<_Tp>::operator=(const indirect_array& __ia) const
{
    typedef const size_t* _Ip;
    const value_type* __s = __ia.__vp_;
    for (_Ip __i = __1d_.__begin_, __e = __1d_.__end_, __j = __ia.__1d_.__begin_;
            __i != __e; ++__i, ++__j)
        __vp_[*__i] = __s[*__j];
    return *this;
}`

well it be fixed ?
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzcV8ty6zYPfhp6gzkeCbJseeGFL_FMFv_q76bdaGgJspgjUSpJ5cR9-g4pybrEOU3arqoFExAE8OFGwlxrcZVEOxYeWHha8MbkldrljakanfNbs7hU6W33LMHkBAnXxJ7O7HBk0VHIVChKTMyV4jcAQ2XtuxUhUcQNQaaqEjQvCV55wZW63YUB2BOyyGPbYyvHglMry4JDzzoB_KCigCsZIKUqBYp0Uxj2FFh-hMw7MW__bBhutAPobAkJUHL9vQM22LzqQiQ03364OXVuZrBb1x7DQMikaFICFhxFpY0iXrLgqTsxYbch4LeB3R9KKROS4H-__v_5tyeG0SvDLUw_hpEWf1CVdWyG5xEdHjwWntz2dqy70UJeQfKSdM0TAm1SG97RiddKpO1_hrRhGA0aNt1BACENCFk3pi0Slyu2OYDH8Ai-XdAugV1Wdgntsga2Od3NQWt8z4L9EIijkIYFTwCZKApKGUatGTwOweh2nGuDsloJaTKHFzvhYA8Mw9QKf-lveJQMrQOdnj6YA-3PaJzRwYxezehwRq-7ZE1TAWAzGhv48BMypTfS_iwN_jT4n4l7a8mFfqrddxHvzEzT0G_OMvFJ0PgI9Khs_gloHPDhI9A4A90bSSqpzWBq1vNDdfZ3m8V-T2IXrnCM-msK8YFCHCv8TOdMv6oxNoMO7scN03vzFw1zbwyn9d4WHeVPKJxQwazAv-gCdi7gz13Ar7mAExdw4gJOXMAHLvQgGJ4ZniHJKfkOOSnqGQ-esYngGH2Sc3l1V9Yd4d8LFpf630-3VXoPVUv4YwLHxPtU_7eu5s1p8li71b6HJRfyg-dy9JKO1ay995qeweRCfm-Hqyp1s0shLsnbG8NzNzswPPd1ACA0_FCVvC47JBlcKpODFilpqDKniH5veAF2rvt4DsMjxPFrHQOXKcSxbgetqibFjagklFRW6gbctGJGlLScDT-2rAqrnQXHpOBaQ_xLfR9uhCyE7JqjvRbf3YbdcVz3Eo_5rhNaZJViwYlh9FAhriGOBbezk-O_ywuAudWUUtbf0-17gnuIn-tRAff3-CsvGoqtjDsTa9fd1sbSxW4iklXKDmnxc21PdCf9NF7G8YWuQsZtyGnCIZl2-y9j3ROxsZH-cxbQb0WIBQdgeGB4iGPR9k5LvNyrcxC0uMMDw709273Hcaz7vZfpgwagyDRKAsO9yYX-SUG7AhIGLgSZeKMUWHBepLsg3QZbvqCdv96it92uo9Ui32X-Ng030ebCk82WNusIN0G6SaIk4GkaJpeF2KGHgRf5oe-vfFwtyc_owkMMkvTCt6uArTwquSiWRfFaLit1XQitG9qtVxsPFwW_UKHdjxpEST_AMe1dEp4Wamdlvl2aq2YrrxDa6EGLEaagna5K6n5y2F8To-qzdN-Oi0YVu9yYWtsidQ_DVZi8uSyTqmR4tkq7P99qVb1QYmxbWyia4dlB_TMAAP__8I2_Sg">