Make Coroutine non-copyable.

While it's possible to make a copy of a coroutine, it should
have more explicit syntax.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/coroutine.h b/src/coroutine.h
index a054308..3e8269e 100644
--- a/src/coroutine.h
+++ b/src/coroutine.h
@@ -30,6 +30,10 @@ public:
 protected:
     virtual void run() {}
 
+private: // not copyable
+    Coroutine(const Coroutine &);
+    Coroutine &operator=(const Coroutine &);
+
 private:
     // for the original coroutine
     Coroutine(bool);