From 298310f521853b1d5caaf3ca13bef4c9b0018915 Mon Sep 17 00:00:00 2001
From: "Jeremy W. Murphy" <jeremy.william.murphy@gmail.com>
Date: Tue, 6 Feb 2018 00:45:21 +1100
Subject: [PATCH] Add BOOST_CXX14_CONSTEXPR to identity_operation.

---
 include/boost/algorithm/algorithm.hpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/boost/algorithm/algorithm.hpp b/include/boost/algorithm/algorithm.hpp
index 96b3b48..2bbee1d 100644
--- a/include/boost/algorithm/algorithm.hpp
+++ b/include/boost/algorithm/algorithm.hpp
@@ -25,10 +25,10 @@
 namespace boost { namespace algorithm {
 
 template <typename T>
-T identity_operation ( std::multiplies<T> ) { return T(1); }
+BOOST_CXX14_CONSTEXPR T identity_operation ( std::multiplies<T> ) { return T(1); }
 
 template <typename T>
-T identity_operation ( std::plus<T> ) { return T(0); }
+BOOST_CXX14_CONSTEXPR T identity_operation ( std::plus<T> ) { return T(0); }
 
 
 /// \fn power ( T x, Integer n )