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-rw-r--r--common/list.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/common/list.h b/common/list.h
index d15913d..cf429e5 100644
--- a/common/list.h
+++ b/common/list.h
@@ -25,7 +25,7 @@ class List : public B {
}
//! Check whether list is empty or not.
- operator bool() {
+ operator bool() const {
return !B::empty();
}