Products OR-Tools Reference C++ Reference: vector_map This documentation is automatically generated. Vector with map from element to index in the vector. Classes VectorMap Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated May 29, 2018.