api/cpp/docs/api/inherit_graph_557.dot

digraph "Graphical Class Hierarchy"
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  Node0 [label="std::hash\< dmlc::optional\l\< T \> \>",height=0.2,width=0.4,color="black", fillcolor="white", style="filled",URL="$structstd_1_1hash_3_01dmlc_1_1optional_3_01T_01_4_01_4.html",tooltip="std hash function for optional"];
}