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Posted to github@arrow.apache.org by "PragmaTwice (via GitHub)" <gi...@apache.org> on 2023/02/02 14:56:49 UTC

[GitHub] [arrow] PragmaTwice opened a new issue, #34001: [C++] rvalue lhs cannot be moved into returned value in Status::operator&

PragmaTwice opened a new issue, #34001:
URL: https://github.com/apache/arrow/issues/34001

   ### Describe the enhancement requested
   
   https://github.com/apache/arrow/blob/a0d0ecee71b99b45f2c1b269c70033d39b982d00/cpp/src/arrow/status.h#L160-L161
   
   Currently there are two overloads for `Status::operator&` to achieve "reference forwarding", but only for the rhs (i.e. `const Status& s` or `Status&& s`), the reference type of lhs value (i.e. `*this`) cannot be forwarded. e.g.
   ```c++
   Status v;
   Status f(/* some parameters */);
   Status g(/* some parameters */);
   
   auto v1 = v & f(); // OK! the rhs rvalue can be moved into result
   auto v2 = f() & v; // Ooops, the lhs rvalue cannot be moved into result
   auto v3 = f() & g(); // Ooops, same as above
   ```
   
   We can add more overloads to forward reference of lhs for better performance.
   
   
   ### Component(s)
   
   C++


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