From 204d30e58d3553278ab6bcda2d4122b0f13f6392 Mon Sep 17 00:00:00 2001
From: artemp <artem@mapnik.org>
Date: Tue, 13 Dec 2016 15:50:00 +0100
Subject: [PATCH] simplify hash calculation (we don't need combine with
 which(), using hash<T> is sufficient)

---
 include/mapnik/value_hash.hpp | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/include/mapnik/value_hash.hpp b/include/mapnik/value_hash.hpp
index 80e10d855..f1119e0b3 100644
--- a/include/mapnik/value_hash.hpp
+++ b/include/mapnik/value_hash.hpp
@@ -54,11 +54,6 @@ struct value_hasher
         return static_cast<std::size_t>(val.hashCode());
     }
 
-    std::size_t operator()(value_integer val) const
-    {
-        return static_cast<std::size_t>(val);
-    }
-
     template <class T>
     std::size_t operator()(T const& val) const
     {
@@ -72,10 +67,7 @@ struct value_hasher
 template <typename T>
 std::size_t mapnik_hash_value(T const& val)
 {
-    std::size_t seed = 0;
-    detail::hash_combine(seed, util::apply_visitor(detail::value_hasher(), val));
-    detail::hash_combine(seed, val.which());
-    return seed;
+    return util::apply_visitor(detail::value_hasher(), val);
 }
 
 } // namespace mapnik