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-rw-r--r--boost/dynamic_bitset/dynamic_bitset.hpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/boost/dynamic_bitset/dynamic_bitset.hpp b/boost/dynamic_bitset/dynamic_bitset.hpp
index 86b5428597..05798b5262 100644
--- a/boost/dynamic_bitset/dynamic_bitset.hpp
+++ b/boost/dynamic_bitset/dynamic_bitset.hpp
@@ -348,6 +348,10 @@ public:
#endif
+public:
+ // forward declaration for optional zero-copy serialization support
+ class serialize_impl;
+ friend class serialize_impl;
private:
BOOST_STATIC_CONSTANT(block_width_type, ulong_width = std::numeric_limits<unsigned long>::digits);