From b9d9fb4a176e704b570d2d1e2e9143a60e3457d5 Mon Sep 17 00:00:00 2001
From: Howard Hinnant <hhinnant@apple.com>
Date: Fri, 28 Jun 2013 18:09:35 +0000
Subject: [PATCH] Dimitry Andric:  Add const to constexpr member functions in
 order to cope with new C++1y language rules.  This silences
 -Wconstexpr-not-const warnings.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@185181 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/chrono | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/chrono b/include/chrono
index 3b96e8164..4ceb875c3 100644
--- a/include/chrono
+++ b/include/chrono
@@ -468,7 +468,7 @@ template <class _LhsDuration, class _RhsDuration>
 struct __duration_eq
 {
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
-    bool operator()(const _LhsDuration& __lhs, const _RhsDuration& __rhs)
+    bool operator()(const _LhsDuration& __lhs, const _RhsDuration& __rhs) const
         {
             typedef typename common_type<_LhsDuration, _RhsDuration>::type _Ct;
             return _Ct(__lhs).count() == _Ct(__rhs).count();
@@ -479,7 +479,7 @@ template <class _LhsDuration>
 struct __duration_eq<_LhsDuration, _LhsDuration>
 {
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
-    bool operator()(const _LhsDuration& __lhs, const _LhsDuration& __rhs)
+    bool operator()(const _LhsDuration& __lhs, const _LhsDuration& __rhs) const
         {return __lhs.count() == __rhs.count();}
 };
 
@@ -509,7 +509,7 @@ template <class _LhsDuration, class _RhsDuration>
 struct __duration_lt
 {
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
-    bool operator()(const _LhsDuration& __lhs, const _RhsDuration& __rhs)
+    bool operator()(const _LhsDuration& __lhs, const _RhsDuration& __rhs) const
         {
             typedef typename common_type<_LhsDuration, _RhsDuration>::type _Ct;
             return _Ct(__lhs).count() < _Ct(__rhs).count();
@@ -520,7 +520,7 @@ template <class _LhsDuration>
 struct __duration_lt<_LhsDuration, _LhsDuration>
 {
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
-    bool operator()(const _LhsDuration& __lhs, const _LhsDuration& __rhs)
+    bool operator()(const _LhsDuration& __lhs, const _LhsDuration& __rhs) const
         {return __lhs.count() < __rhs.count();}
 };