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From 5e61a97a0b56d3d4121d3cbb6b85032f9839545a Mon Sep 17 00:00:00 2001
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From: nre <nre@ableton.com>
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Date: Thu, 22 Dec 2016 13:25:35 +0100
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Subject: [PATCH] Fix compiler error with release builds on VS2015
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When using MSVC compiler optimization, using param_not_found() causes
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compiler error C4172: returning address of local variable or temporary
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---
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 include/boost/graph/named_function_params.hpp | 3 ++-
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 1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/include/boost/graph/named_function_params.hpp b/include/boost/graph/named_function_params.hpp
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index a9a9add6c..4842dc954 100644
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--- a/include/boost/graph/named_function_params.hpp
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+++ b/include/boost/graph/named_function_params.hpp
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@@ -228,6 +228,7 @@ BOOST_BGL_DECLARE_NAMED_PARAMS
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   };
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   struct param_not_found {};
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+  static param_not_found g_param_not_found;
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   template <typename Tag, typename Args>
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   struct get_param_type: 
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@@ -237,7 +238,7 @@ BOOST_BGL_DECLARE_NAMED_PARAMS
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   inline
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   const typename lookup_named_param_def<Tag, Args, param_not_found>::type&
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   get_param(const Args& p, Tag) {
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-    return lookup_named_param_def<Tag, Args, param_not_found>::get(p, param_not_found());
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+    return lookup_named_param_def<Tag, Args, param_not_found>::get(p, g_param_not_found);
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   }
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   template <class P, class Default>