pitrou commented on a change in pull request #7901:
URL: https://github.com/apache/arrow/pull/7901#discussion_r465753604
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File path: cpp/src/arrow/util/formatting.h
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@@ -40,12 +40,51 @@ namespace arrow {
namespace internal {
/// \brief The entry point for conversion to strings.
+///
+/// Specializations of FormatValueTraits for `ARROW_TYPE` must define:
+/// - A member type `value_type` which will be formatted.
+/// - A static member function `MaxSize(const ARROW_TYPE& t)` indicating the
+/// maximum number of characters which formatting a `value_type` may yield.
+/// - The static member function `Convert`, callable with signature
Review comment:
I see, fair enough.
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