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-rw-r--r--boost/thread/externally_locked.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/boost/thread/externally_locked.hpp b/boost/thread/externally_locked.hpp
index 0d4baaa512..4b9ac4c637 100644
--- a/boost/thread/externally_locked.hpp
+++ b/boost/thread/externally_locked.hpp
@@ -24,6 +24,7 @@
namespace boost
{
+ class mutex;
/**
* externally_locked cloaks an object of type T, and actually provides full