[GitHub] [arrow] js8544 opened a new issue, #15292: [C++] Typeclass alias is missing in ExtensionArray

[GitBox <gi...@apache.org>]

js8544 opened a new issue, #15292:
URL: https://github.com/apache/arrow/issues/15292

   ### Describe the bug, including details regarding any error messages, version, and platform.
   
   All array classes have the `using TypeClass = xxx` type alias except for ExtensionArray.
   
   With the alias, it will be easier to write templated inline visitors such as the following code block:
   
   ```Cpp
   class ExampleVisitor {
    public:
     template <typename T>
     Status Visit(const T& arr) {
       if constexpr (arrow::is_number_type<typename T::TypeClass>::value) {
         ///
       } else {
         ///
       }
       return Status::OK();
     }
   };
   ```
   
   Current it fails to compile with message: `No type named 'TypeClass' in 'arrow::ExtensionArray'`.
   
   ### Component(s)
   
   C++


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[GitHub] [arrow] pitrou closed issue #15292: [C++] Typeclass alias is missing in ExtensionArray

[GitBox <gi...@apache.org>]

pitrou closed issue #15292: [C++] Typeclass alias is missing in ExtensionArray
URL: https://github.com/apache/arrow/issues/15292


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