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[patch] std::packaged_task(allocator_arg_t, const A&, F&&) should not be explicit


http://wiki.edg.com/twiki/pub/Wg21lenexa/StrawPolls/N4525.html#2407

Voted into the WP in Lenexa.

Tested powerpc64le-linux, committed to trunk.
commit f58bb7ab1b098d525359869767286f9c8955acd3
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed May 13 14:39:24 2015 +0100

    	* include/std/future (packaged_task(allocator_arg_t, const A&, F&&):
    	Remove explicit (LWG 2407).

diff --git a/libstdc++-v3/include/std/future b/libstdc++-v3/include/std/future
index a67db98..c4baf90 100644
--- a/libstdc++-v3/include/std/future
+++ b/libstdc++-v3/include/std/future
@@ -1489,9 +1489,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
       // _GLIBCXX_RESOLVE_LIB_DEFECTS
       // 2097.  packaged_task constructors should be constrained
+      // 2407. [this constructor should not be] explicit
       template<typename _Fn, typename _Alloc, typename = typename
 	       __constrain_pkgdtask<packaged_task, _Fn>::__type>
-	explicit
 	packaged_task(allocator_arg_t, const _Alloc& __a, _Fn&& __fn)
 	: _M_state(__create_task_state<_Res(_ArgTypes...)>(
 		    std::forward<_Fn>(__fn), __a))

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