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Posted to issues@arrow.apache.org by "Xuwei Fu (Jira)" <ji...@apache.org> on 2022/08/15 05:23:00 UTC
[jira] [Created] (ARROW-17408) C++20 compile arrow get `operator==` ambiguous
Xuwei Fu created ARROW-17408:
--------------------------------
Summary: C++20 compile arrow get `operator==` ambiguous
Key: ARROW-17408
URL: https://issues.apache.org/jira/browse/ARROW-17408
Project: Apache Arrow
Issue Type: Bug
Components: C++
Affects Versions: 9.0.0
Reporter: Xuwei Fu
When compiling arrow-9.0.0 in C++20, I got:
```
In file included from ../arrow/cpp/src/arrow/ipc/dictionary.cc:32:
../arrow/cpp/src/arrow/record_batch.h:266:21: warning: ISO C++20 considers use of overloaded operator '==' (with operand types 'const Result<std::shared_ptr<RecordBatch>>' and 'const Result<std::shared_ptr<RecordBatch>>') to be ambiguous despite there being a unique best viable function [-Wambiguous-reversed-operator]
return batch_ == other.batch_;
~~~~~~ ^ ~~~~~~~~~~~~
../arrow/cpp/src/arrow/util/compare.h:54:8: note: ambiguity is between a regular call to this operator and a call with the argument order reversed
bool operator==(const T& other) const \{ return cast().Equals(other); }
^
In file included from ../arrow/cpp/src/arrow/ipc/dictionary.cc:18:
In file included from ../arrow/cpp/src/arrow/ipc/dictionary.h:27:
../arrow/cpp/src/arrow/result.h:278:20: warning: ISO C++20 considers use of overloaded operator '==' (with operand types 'const arrow::Status' and 'const arrow::Status') to be ambiguous despite there being a unique best viable function [-Wambiguous-reversed-operator]
return status_ == other.status_;
~~~~~~~ ^ ~~~~~~~~~~~~~
../arrow/cpp/src/arrow/util/compare.h:54:57: note: in instantiation of member function 'arrow::Result<std::shared_ptr<arrow::RecordBatch>>::Equals' requested here
bool operator==(const T& other) const \{ return cast().Equals(other); }
^
../arrow/cpp/src/arrow/record_batch.h:266:21: note: in instantiation of member function 'arrow::util::EqualityComparable<arrow::Result<std::shared_ptr<arrow::RecordBatch>>>::operator==' requested here
return batch_ == other.batch_;
^
../arrow/cpp/src/arrow/util/compare.h:54:8: note: ambiguity is between a regular call to this operator and a call with the argument order reversed
bool operator==(const T& other) const \{ return cast().Equals(other); }
^
2 warnings generated.
In file included from ../arrow/cpp/src/arrow/ipc/message.cc:33:
In file included from ../arrow/cpp/src/arrow/ipc/reader.h:32:
../arrow/cpp/src/arrow/record_batch.h:266:21: warning: ISO C++20 considers use of overloaded operator '==' (with operand types 'const Result<std::shared_ptr<RecordBatch>>' and 'const Result<std::shared_ptr<RecordBatch>>') to be ambiguous despite there being a unique best viable function [-Wambiguous-reversed-operator]
return batch_ == other.batch_;
~~~~~~ ^ ~~~~~~~~~~~~
../arrow/cpp/src/arrow/util/compare.h:54:8: note: ambiguity is between a regular call to this operator and a call with the argument order reversed
bool operator==(const T& other) const \{ return cast().Equals(other); }
^
In file included from ../arrow/cpp/src/arrow/ipc/message.cc:18:
In file included from ../arrow/cpp/src/arrow/ipc/message.h:30:
../arrow/cpp/src/arrow/result.h:278:20: warning: ISO C++20 considers use of overloaded operator '==' (with operand types 'const arrow::Status' and 'const arrow::Status') to be ambiguous despite there being a unique best viable function [-Wambiguous-reversed-operator]
return status_ == other.status_;
~~~~~~~ ^ ~~~~~~~~~~~~~
../arrow/cpp/src/arrow/util/compare.h:54:57: note: in instantiation of member function 'arrow::Result<std::shared_ptr<arrow::RecordBatch>>::Equals' requested here
bool operator==(const T& other) const \{ return cast().Equals(other); }
^
../arrow/cpp/src/arrow/record_batch.h:266:21: note: in instantiation of member function 'arrow::util::EqualityComparable<arrow::Result<std::shared_ptr<arrow::RecordBatch>>>::operator==' requested here
return batch_ == other.batch_;
^
../arrow/cpp/src/arrow/util/compare.h:54:8: note: ambiguity is between a regular call to this operator and a call with the argument order reversed
bool operator==(const T& other) const \{ return cast().Equals(other); }
```
Generate or hand written `operator==` for `Result` maybe fixing this problem
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