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-rw-r--r--c++/descriptor.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/c++/descriptor.hpp b/c++/descriptor.hpp
index 23c82f2..0d05a04 100644
--- a/c++/descriptor.hpp
+++ b/c++/descriptor.hpp
@@ -202,6 +202,7 @@ public:
data<Sch, Encode>& operator()(const data<schema::UInt64>& index){
return inner_.at(index);
}
+
const data<Sch, Encode>& operator()(const data<schema::UInt64>& index)const{
return inner_.at(index);
}