fix missing namespace mbed

platform/SharedPtr.h

@@ -24,6 +24,8 @@
 
 #include "platform/mbed_critical.h"
 
+namespace mbed {
+
 /** Shared pointer class.
   *
   * A shared pointer is a "smart" pointer that retains ownership of an object using
@@ -285,4 +287,6 @@ bool operator!= (U lhs, const SharedPtr<T> &rhs)
     return ((T *) lhs != rhs.get());
 }
 
+} /* namespace mbed */
+
 #endif // __SHAREDPTR_H__