Hash utility

wxdata/include/scwx/util/hash.hpp

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <string>
+#include <utility>
+
+namespace scwx
+{
+namespace util
+{
+
+template<class Key>
+struct hash;
+
+template<>
+struct hash<std::pair<std::string, std::string>>
+{
+   size_t operator()(const std::pair<std::string, std::string>& x) const;
+};
+
+} // namespace util
+} // namespace scwx

wxdata/source/scwx/util/hash.cpp

@@ -0,0 +1,20 @@
+#include <scwx/util/hash.hpp>
+
+#include <boost/container_hash/hash.hpp>
+
+namespace scwx
+{
+namespace util
+{
+
+size_t hash<std::pair<std::string, std::string>>::operator()(
+   const std::pair<std::string, std::string>& x) const
+{
+   size_t seed = 0;
+   boost::hash_combine(seed, x.first);
+   boost::hash_combine(seed, x.second);
+   return seed;
+}
+
+} // namespace util
+} // namespace scwx

wxdata/wxdata.cmake

@@ -46,6 +46,7 @@ set(SRC_PROVIDER source/scwx/provider/aws_level2_data_provider.cpp
                  source/scwx/provider/nexrad_data_provider_factory.cpp)
 set(HDR_UTIL include/scwx/util/environment.hpp
              include/scwx/util/float.hpp
+             include/scwx/util/hash.hpp
              include/scwx/util/iterator.hpp
              include/scwx/util/logger.hpp
              include/scwx/util/map.hpp
@@ -56,6 +57,7 @@ set(HDR_UTIL include/scwx/util/environment.hpp
              include/scwx/util/vectorbuf.hpp)
 set(SRC_UTIL source/scwx/util/environment.cpp
              source/scwx/util/float.cpp
+             source/scwx/util/hash.cpp
              source/scwx/util/logger.cpp
              source/scwx/util/rangebuf.cpp
              source/scwx/util/streams.cpp