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-rw-r--r--src/i_engine.hpp4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/i_engine.hpp b/src/i_engine.hpp
index 19359b7..93cd8b1 100644
--- a/src/i_engine.hpp
+++ b/src/i_engine.hpp
@@ -25,6 +25,8 @@
namespace zmq
{
+ class io_thread_t;
+
// Abstract interface to be implemented by various engines.
struct i_engine
@@ -32,7 +34,7 @@ namespace zmq
virtual ~i_engine () {}
// Plug the engine to the session.
- virtual void plug (class io_thread_t *io_thread_,
+ virtual void plug (zmq::io_thread_t *io_thread_,
class session_base_t *session_) = 0;
// Unplug the engine from the session.