From 32bbb362efbc5d0a9269c8f32258360c622121db Mon Sep 17 00:00:00 2001
From: Edward Smith-Rowland <emsr@gcc.gnu.org>
Date: Fri, 30 Nov 2018 16:13:29 +0000
Subject: [PATCH] The remainder of the Pre-emptively support P0646R1 for std
 container erasure.

From-SVN: r266673
---
 libstdc++-v3/include/std/deque | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/include/std/deque b/libstdc++-v3/include/std/deque
index 25de200..23dc752 100644
--- a/libstdc++-v3/include/std/deque
+++ b/libstdc++-v3/include/std/deque
@@ -95,19 +95,23 @@ namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _Tp, typename _Alloc, typename _Predicate>
-    inline void
+    inline typename deque<_Tp, _Alloc>::size_type
     erase_if(deque<_Tp, _Alloc>& __cont, _Predicate __pred)
     {
+      const auto __osz = __cont.size();
       __cont.erase(std::remove_if(__cont.begin(), __cont.end(), __pred),
 		   __cont.end());
+      return __osz - __cont.size();
     }
 
   template<typename _Tp, typename _Alloc, typename _Up>
-    inline void
+    inline typename deque<_Tp, _Alloc>::size_type
     erase(deque<_Tp, _Alloc>& __cont, const _Up& __value)
     {
+      const auto __osz = __cont.size();
       __cont.erase(std::remove(__cont.begin(), __cont.end(), __value),
 		   __cont.end());
+      return __osz - __cont.size();
     }
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
-- 
2.7.4