Re: [PR] GH-46299: [C++][Compute] Don't use `static inline const` for default options [arrow]

[via GitHub]

pitrou commented on code in PR #46303:
URL: https://github.com/apache/arrow/pull/46303#discussion_r2074038744


##########
cpp/src/arrow/compute/kernels/vector_rank.cc:
##########
@@ -381,9 +381,13 @@ class RankMetaFunction : public 
RankMetaFunctionBase<RankMetaFunction> {
   }
 
   RankMetaFunction()
-      : RankMetaFunctionBase("rank", Arity::Unary(), rank_doc, 
&kDefaultOptions) {}
+      : RankMetaFunctionBase("rank", Arity::Unary(), rank_doc, 
GetDefaultOptions()) {}

Review Comment:
   Do you think it would work to do something like:
   ```c++
   // in .h file
   template <typename OptionsType>
   const FunctionOptions* StaticOptionsInit() {
     static const auto kDefaultOptions = OptionsType::Defaults();
     return &kDefaultOptions
   };
   
   // in .cc file
   class RankMetaFunction : public RankMetaFunctionBase<RankMetaFunction> {
    public:
     RankMetaFunction()
         : RankMetaFunctionBase("rank", Arity::Unary(), rank_doc, 
StaticOptionsInit<RankOptions>()) {}
   ```



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