[C++] clang compiler warnings from overridden virtual functions

[asfimport]

n file included from /home/wesm/code/arrow/cpp/src/arrow/array.cc:18:
/home/wesm/code/arrow/cpp/src/arrow/array.h:150:8: error: 'ApproxEquals' overrides a member function but is not marked 'override' [-Werror,-Winconsistent-missing-override]
  bool ApproxEquals(const std::shared_ptr<Array>& arr) const { return Equals(arr); }
       ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:176:13: note: in instantiation of template class 'arrow::NumericArray<arrow::FloatType>' requested here
inline bool NumericArray<FloatType>::ApproxEquals(
            ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:68:16: note: overridden virtual function is here
  virtual bool ApproxEquals(const std::shared_ptr<Array>& arr) const;
               ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:150:8: error: 'ApproxEquals' overrides a member function but is not marked 'override' [-Werror,-Winconsistent-missing-override]
  bool ApproxEquals(const std::shared_ptr<Array>& arr) const { return Equals(arr); }
       ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:212:13: note: in instantiation of template class 'arrow::NumericArray<arrow::DoubleType>' requested here
inline bool NumericArray<DoubleType>::ApproxEquals(
            ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:68:16: note: overridden virtual function is here
  virtual bool ApproxEquals(const std::shared_ptr<Array>& arr) const;
               ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:150:8: error: 'ApproxEquals' overrides a member function but is not marked 'override' [-Werror,-Winconsistent-missing-override]
  bool ApproxEquals(const std::shared_ptr<Array>& arr) const { return Equals(arr); }
       ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:459:62: note: in instantiation of template class 'arrow::NumericArray<arrow::Int8Type>' requested here
extern template class __attribute__((visibility("default"))) NumericArray<Int8Type>;
                                                             ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:68:16: note: overridden virtual function is here
  virtual bool ApproxEquals(const std::shared_ptr<Array>& arr) const;
               ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:150:8: error: 'ApproxEquals' overrides a member function but is not marked 'override' [-Werror,-Winconsistent-missing-override]
  bool ApproxEquals(const std::shared_ptr<Array>& arr) const { return Equals(arr); }
       ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:460:62: note: in instantiation of template class 'arrow::NumericArray<arrow::UInt8Type>' requested here
extern template class __attribute__((visibility("default"))) NumericArray<UInt8Type>;
                                                             ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:68:16: note: overridden virtual function is here
  virtual bool ApproxEquals(const std::shared_ptr<Array>& arr) const;
               ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:150:8: error: 'ApproxEquals' overrides a member function but is not marked 'override' [-Werror,-Winconsistent-missing-override]
  bool ApproxEquals(const std::shared_ptr<Array>& arr) const { return Equals(arr); }
       ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:461:62: note: in instantiation of template class 'arrow::NumericArray<arrow::Int16Type>' requested here
extern template class __attribute__((visibility("default"))) NumericArray<Int16Type>;
                                                             ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:68:16: note: overridden virtual function is here
  virtual bool ApproxEquals(const std::shared_ptr<Array>& arr) const;
               ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:150:8: error: 'ApproxEquals' overrides a member function but is not marked 'override' [-Werror,-Winconsistent-missing-override]
  bool ApproxEquals(const std::shared_ptr<Array>& arr) const { return Equals(arr); }
       ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:462:62: note: in instantiation of template class 'arrow::NumericArray<arrow::UInt16Type>' requested here
extern template class __attribute__((visibility("default"))) NumericArray<UInt16Type>;
                                                             ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:68:16: note: overridden virtual function is here
  virtual bool ApproxEquals(const std::shared_ptr<Array>& arr) const;
               ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:150:8: error: 'ApproxEquals' overrides a member function but is not marked 'override' [-Werror,-Winconsistent-missing-override]
  bool ApproxEquals(const std::shared_ptr<Array>& arr) const { return Equals(arr); }
       ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:463:62: note: in instantiation of template class 'arrow::NumericArray<arrow::Int32Type>' requested here
extern template class __attribute__((visibility("default"))) NumericArray<Int32Type>;
                                                             ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:68:16: note: overridden virtual function is here
  virtual bool ApproxEquals(const std::shared_ptr<Array>& arr) const;
               ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:150:8: error: 'ApproxEquals' overrides a member function but is not marked 'override' [-Werror,-Winconsistent-missing-override]
  bool ApproxEquals(const std::shared_ptr<Array>& arr) const { return Equals(arr); }
       ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:464:62: note: in instantiation of template class 'arrow::NumericArray<arrow::UInt32Type>' requested here
extern template class __attribute__((visibility("default"))) NumericArray<UInt32Type>;
                                                             ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:68:16: note: overridden virtual function is here
  virtual bool ApproxEquals(const std::shared_ptr<Array>& arr) const;
               ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:150:8: error: 'ApproxEquals' overrides a member function but is not marked 'override' [-Werror,-Winconsistent-missing-override]
  bool ApproxEquals(const std::shared_ptr<Array>& arr) const { return Equals(arr); }
       ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:465:62: note: in instantiation of template class 'arrow::NumericArray<arrow::Int64Type>' requested here
extern template class __attribute__((visibility("default"))) NumericArray<Int64Type>;
                                                             ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:68:16: note: overridden virtual function is here
  virtual bool ApproxEquals(const std::shared_ptr<Array>& arr) const;
               ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:150:8: error: 'ApproxEquals' overrides a member function but is not marked 'override' [-Werror,-Winconsistent-missing-override]
  bool ApproxEquals(const std::shared_ptr<Array>& arr) const { return Equals(arr); }
       ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:466:62: note: in instantiation of template class 'arrow::NumericArray<arrow::UInt64Type>' requested here
extern template class __attribute__((visibility("default"))) NumericArray<UInt64Type>;
                                                             ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:68:16: note: overridden virtual function is here
  virtual bool ApproxEquals(const std::shared_ptr<Array>& arr) const;
               ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:150:8: error: 'ApproxEquals' overrides a member function but is not marked 'override' [-Werror,-Winconsistent-missing-override]
  bool ApproxEquals(const std::shared_ptr<Array>& arr) const { return Equals(arr); }
       ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:467:62: note: in instantiation of template class 'arrow::NumericArray<arrow::HalfFloatType>' requested here
extern template class __attribute__((visibility("default"))) NumericArray<HalfFloatType>;
                                                             ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:68:16: note: overridden virtual function is here
  virtual bool ApproxEquals(const std::shared_ptr<Array>& arr) const;
               ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:150:8: error: 'ApproxEquals' overrides a member function but is not marked 'override' [-Werror,-Winconsistent-missing-override]
  bool ApproxEquals(const std::shared_ptr<Array>& arr) const { return Equals(arr); }
       ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:470:62: note: in instantiation of template class 'arrow::NumericArray<arrow::TimestampType>' requested here
extern template class __attribute__((visibility("default"))) NumericArray<TimestampType>;
                                                             ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:68:16: note: overridden virtual function is here
  virtual bool ApproxEquals(const std::shared_ptr<Array>& arr) const;
               ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:150:8: error: 'ApproxEquals' overrides a member function but is not marked 'override' [-Werror,-Winconsistent-missing-override]
  bool ApproxEquals(const std::shared_ptr<Array>& arr) const { return Equals(arr); }
       ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:471:62: note: in instantiation of template class 'arrow::NumericArray<arrow::DateType>' requested here
extern template class __attribute__((visibility("default"))) NumericArray<DateType>;
                                                             ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:68:16: note: overridden virtual function is here
  virtual bool ApproxEquals(const std::shared_ptr<Array>& arr) const;
               ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:150:8: error: 'ApproxEquals' overrides a member function but is not marked 'override' [-Werror,-Winconsistent-missing-override]
  bool ApproxEquals(const std::shared_ptr<Array>& arr) const { return Equals(arr); }
       ^
/home/wesm/code/arrow/cpp/src/arrow/array.cc:88:25: note: in instantiation of template class 'arrow::NumericArray<arrow::IntervalType>' requested here
  return visitor->Visit(*this);
                        ^
/home/wesm/code/arrow/cpp/src/arrow/array.h:68:16: note: overridden virtual function is here
  virtual bool ApproxEquals(const std::shared_ptr<Array>& arr) const;
              ^

Reporter: Wes McKinney / @wesm
Assignee: Wes McKinney / @wesm

_{Note: This issue was originally created as ARROW-437. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
PR: #254

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 254
#254