From 9c4c3a754a2c1454afdde5c4eee978272bd0b392 Mon Sep 17 00:00:00 2001
From: Daniel James <daniel@calamity.org.uk>
Date: Mon, 27 Feb 2017 03:59:02 +0000
Subject: [PATCH] Const methods in value_base.

---
 include/boost/unordered/detail/implementation.hpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/boost/unordered/detail/implementation.hpp b/include/boost/unordered/detail/implementation.hpp
index b80dbed0..43cab65c 100644
--- a/include/boost/unordered/detail/implementation.hpp
+++ b/include/boost/unordered/detail/implementation.hpp
@@ -2500,8 +2500,12 @@ template <typename ValueType> struct value_base
 
     value_type& value() { return *(ValueType*)this; }
 
+    value_type const& value() const { return *(ValueType const*)this; }
+
     value_type* value_ptr() { return (ValueType*)this; }
 
+    value_type const* value_ptr() const { return (ValueType const*)this; }
+
   private:
     value_base& operator=(value_base const&);
 };