From 52b42b4e485d166f719e115d55855c31b8f27948 Mon Sep 17 00:00:00 2001
From: Daniel James <daniel@calamity.org.uk>
Date: Thu, 8 Aug 2013 20:27:40 +0000
Subject: [PATCH] Fix unused variable warning. Refs #8851.

Bit annoying that `boost::ignore_unused_variable_warning` is in
`<boost/concept_check.hpp>`.

[SVN r85244]
---
 include/boost/unordered/detail/table.hpp | 2 ++
 include/boost/unordered/detail/util.hpp  | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/include/boost/unordered/detail/table.hpp b/include/boost/unordered/detail/table.hpp
index 84d1183d..99f2e4bb 100644
--- a/include/boost/unordered/detail/table.hpp
+++ b/include/boost/unordered/detail/table.hpp
@@ -456,6 +456,8 @@ namespace boost { namespace unordered { namespace detail {
 
         void swap_allocators(table& other, false_type)
         {
+            boost::unordered::detail::ignore_unused_variable_warning(other);
+
             // According to 23.2.1.8, if propagate_on_container_swap is
             // false the behaviour is undefined unless the allocators
             // are equal.
diff --git a/include/boost/unordered/detail/util.hpp b/include/boost/unordered/detail/util.hpp
index a901477d..325124a7 100644
--- a/include/boost/unordered/detail/util.hpp
+++ b/include/boost/unordered/detail/util.hpp
@@ -28,6 +28,8 @@ namespace boost { namespace unordered { namespace detail {
     struct move_tag {};
     struct empty_emplace {};
 
+    template <class T> inline void ignore_unused_variable_warning(T const&) {}
+
     ////////////////////////////////////////////////////////////////////////////
     // iterator SFINAE