pitrou commented on a change in pull request #8143:
URL: https://github.com/apache/arrow/pull/8143#discussion_r485460964
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File path: cpp/src/arrow/util/decimal.cc
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@@ -42,34 +45,40 @@ namespace arrow {
using internal::SafeLeftShift;
using internal::SafeSignedAdd;
+#ifdef __SIZEOF_INT128__
+using uint128_t = __uint128_t;
+#else
+using boost::multiprecision::uint128_t;
+#endif
Review comment:
I'll note that `src/arrow/util/decimal_test.cc` also uses `int128_t`.
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