Change the return type of emplace_[front|back] back to void when building with C++14 or before. Resolves PR31680.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@292990 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/queue b/include/queue
index 271c203..57d420c 100644
--- a/include/queue
+++ b/include/queue
@@ -63,7 +63,7 @@
void push(const value_type& v);
void push(value_type&& v);
- template <class... Args> reference emplace(Args&&... args);
+ template <class... Args> reference emplace(Args&&... args); // reference in C++17
void pop();
void swap(queue& q) noexcept(is_nothrow_swappable_v<Container>)
@@ -292,8 +292,13 @@
#ifndef _LIBCPP_HAS_NO_VARIADICS
template <class... _Args>
_LIBCPP_INLINE_VISIBILITY
+#if _LIBCPP_STD_VER > 14
reference emplace(_Args&&... __args)
{ return c.emplace_back(_VSTD::forward<_Args>(__args)...);}
+#else
+ void emplace(_Args&&... __args)
+ { c.emplace_back(_VSTD::forward<_Args>(__args)...);}
+#endif
#endif // _LIBCPP_HAS_NO_VARIADICS
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
_LIBCPP_INLINE_VISIBILITY
