Revert "boost::none_t no longer convertible from literal 0 in 1.58"

This reverts commit 48aec0f093ff6494a3e4f7cd5166cb4a27c16814.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/post.h b/src/post.h
index 3fa67e56..0fb45e90 100644
--- a/src/post.h
+++ b/src/post.h
@@ -205,7 +205,11 @@ public:
   mutable optional<xdata_t> xdata_;
 
   bool has_xdata() const {
-    return xdata_ != boost::none;
+#if BOOST_VERSION >= 105600
+    return xdata_ != NULL;
+#else
+    return xdata_;
+#endif
   }
   void clear_xdata() {
     xdata_ = none;