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The advantage of this project is that you can use this hash map by including only 2 files to your project. (or 1 if you want by cut/paste pool.hpp content directly in hashmap.hpp if you want).
It is template and doesn't require that your contained types are PODs, it doesn't require to set delete_key and empty_key. Unlike google densemap.
It is mostly "C++ unordered_map" standard conformant and if you download it, you'll find a visual studio project, or a CMakeLists.txt that integrates the test suite from GCC for unordered_map. ...