Otherwise, at least recent Clang trunk with -std=gnu++17 complains
In file included from
lib/gcc/x86_64-pc-linux-gnu/8.0.0/../../../../include/c++/8.0.0/functional:60:
In file included from
lib/gcc/x86_64-pc-linux-gnu/8.0.0/../../../../include/c++/8.0.0/unordered_map:47:
lib/gcc/x86_64-pc-linux-gnu/8.0.0/../../../../include/c++/8.0.0/bits/unordered_map.h:1197:5:
error: deduction guide template contains a template parameter that cannot be
deduced
unordered_map(initializer_list<pair<_Key, _Tp>>, _Allocator)
^
lib/gcc/x86_64-pc-linux-gnu/8.0.0/../../../../include/c++/8.0.0/bits/unordered_map.h:1196:34:
note: non-deducible template parameter (anonymous)
_RequireAllocator<_Allocator>>
^
1 error generated.
>From 0ecb03c59b9318b3f47e49daa2f45dd513035d55 Mon Sep 17 00:00:00 2001
From: Stephan Bergmann <sberg...@redhat.com>
Date: Fri, 24 Nov 2017 17:55:38 +0100
Subject: [PATCH] Fix typo in unordered_map deduction guide, missing "typename
="
...as correctly appears in all the other deduction guides in these files.
---
libstdc++-v3/include/bits/unordered_map.h | 2 +-
libstdc++-v3/include/debug/unordered_map | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/libstdc++-v3/include/bits/unordered_map.h b/libstdc++-v3/include/bits/unordered_map.h
index cb5bcb89a16..27c89f172e1 100644
--- a/libstdc++-v3/include/bits/unordered_map.h
+++ b/libstdc++-v3/include/bits/unordered_map.h
@@ -1193,7 +1193,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
-> unordered_map<_Key, _Tp, hash<_Key>, equal_to<_Key>, _Allocator>;
template<typename _Key, typename _Tp, typename _Allocator,
- _RequireAllocator<_Allocator>>
+ typename = _RequireAllocator<_Allocator>>
unordered_map(initializer_list<pair<_Key, _Tp>>, _Allocator)
-> unordered_map<_Key, _Tp, hash<_Key>, equal_to<_Key>, _Allocator>;
diff --git a/libstdc++-v3/include/debug/unordered_map b/libstdc++-v3/include/debug/unordered_map
index c5734304846..c68ccaa3372 100644
--- a/libstdc++-v3/include/debug/unordered_map
+++ b/libstdc++-v3/include/debug/unordered_map
@@ -679,7 +679,7 @@ namespace __debug
-> unordered_map<_Key, _Tp, hash<_Key>, equal_to<_Key>, _Allocator>;
template<typename _Key, typename _Tp, typename _Allocator,
- _RequireAllocator<_Allocator>>
+ typename = _RequireAllocator<_Allocator>>
unordered_map(initializer_list<pair<_Key, _Tp>>, _Allocator)
-> unordered_map<_Key, _Tp, hash<_Key>, equal_to<_Key>, _Allocator>;
--
2.13.6
