From 8a97f05d92a34589e1cf87865d0e0b5394ac05b3 Mon Sep 17 00:00:00 2001
From: Alexander Karatarakis <alkarata@microsoft.com>
Date: Wed, 2 Nov 2016 19:33:11 -0700
Subject: [Maps] Add function extract_keys()

---
 toolsrc/include/vcpkg_Maps.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/toolsrc/include/vcpkg_Maps.h b/toolsrc/include/vcpkg_Maps.h
index 5b7b8ed46..886889294 100644
--- a/toolsrc/include/vcpkg_Maps.h
+++ b/toolsrc/include/vcpkg_Maps.h
@@ -15,4 +15,15 @@ namespace vcpkg { namespace Maps
         }
         return key_set;
     }
+
+    template <typename K, typename V>
+    std::vector<K> extract_keys(const std::unordered_map<K, V>& input_map)
+    {
+        std::vector<K> key_set;
+        for (auto const& element : input_map)
+        {
+            key_set.push_back(element.first);
+        }
+        return key_set;
+    }
 }}
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