why do not implement this?

diff --git a/src/kernel/resource/DiskImpl.cpp b/src/kernel/resource/DiskImpl.cpp
index f44e3ff..a7ace5d 100644 (file)
--- a/src/kernel/resource/DiskImpl.cpp
+++ b/src/kernel/resource/DiskImpl.cpp
@@ -69,7 +69,7 @@ void DiskImpl::destroy()
 
 bool DiskImpl::is_used() const
 {
-  THROW_UNIMPLEMENTED;
+  return get_model()->get_maxmin_system()->constraint_used(get_constraint());
 }
 
 void DiskImpl::apply_event(kernel::profile::Event* /*event*/, double /*value*/)