9prady9 commented on a change in pull request #11887:
URL: https://github.com/apache/arrow/pull/11887#discussion_r764508105
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File path: cpp/src/arrow/util/launder.h
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@@ -22,7 +22,7 @@
namespace arrow {
namespace internal {
-#if __cplusplus >= 201703L
+#ifdef __cpp_lib_launder
Review comment:
This could be potentially be tested in cross platform way using [newer
CMake](https://cmake.org/cmake/help/latest/manual/cmake-compile-features.7.html),
but I am not sure if this particular one is added to CMake. Have to check.
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