future (future::share): Add.

2011-03-25  Jonathan Wakely  <jwakely.gcc@gmail.com>

	* include/std/future (future::share): Add.
	(packaged_task::result_type): Remove as per LWG 2030.
	(packaged_task::packaged_task): Remove redundant constructors, as per
	LWG 1514.
	* testsuite/30_threads/future/members/share.cc: New.
	* testsuite/30_threads/packaged_task/requirements/typedefs.cc: Remove.

From-SVN: r171531

diff --git a/libstdc++-v3/include/std/future b/libstdc++-v3/include/std/future
index 17d46dbd431770cd10b92b8509dc2545151d2ec7..7a62d5ecf2835ef6b6ae3e439cc8ea43195ccf6e 100644 (file)
--- a/libstdc++-v3/include/std/future
+++ b/libstdc++-v3/include/std/future
@@ -618,6 +618,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
         typename _Base_type::_Reset __reset(*this);
         return std::move(this->_M_get_result()._M_value());
       }
+
+      shared_future<_Res> share();
     };
  
   /// Partial specialization for future<R&>
@@ -659,6 +661,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
         typename _Base_type::_Reset __reset(*this);
         return this->_M_get_result()._M_get();
       }
+
+      shared_future<_Res&> share();
     };
 
   /// Explicit specialization for future<void>
@@ -700,6 +704,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
         typename _Base_type::_Reset __reset(*this);
         this->_M_get_result();
       }
+
+      shared_future<void> share();
     };
 
 
@@ -844,6 +850,19 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     : _M_state(std::move(__uf._M_state))
     { }
 
+  template<typename _Res>
+    inline shared_future<_Res>
+    future<_Res>::share()
+    { return shared_future<_Res>(std::move(*this)); }
+
+  template<typename _Res>
+    inline shared_future<_Res&>
+    future<_Res&>::share()
+    { return shared_future<_Res&>(std::move(*this)); }
+
+  inline shared_future<void>
+  future<void>::share()
+  { return shared_future<void>(std::move(*this)); }
 
   /// Primary template for promise
   template<typename _Res>
@@ -1198,32 +1217,20 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       shared_ptr<_State_type>                   _M_state;
 
     public:
-      typedef _Res result_type;
-
       // Construction and destruction
       packaged_task() { }
 
-      template<typename _Fn>
-        explicit
-        packaged_task(const _Fn& __fn)
-        : _M_state(std::make_shared<_State_type>(__fn))
-        { }
-
       template<typename _Fn>
         explicit
         packaged_task(_Fn&& __fn)
-        : _M_state(std::make_shared<_State_type>(std::move(__fn)))
+        : _M_state(std::make_shared<_State_type>(std::forward<_Fn>(__fn)))
         { }
 
-      explicit
-      packaged_task(_Res(*__fn)(_ArgTypes...))
-      : _M_state(std::make_shared<_State_type>(__fn))
-      { }
-
       template<typename _Fn, typename _Allocator>
         explicit
-        packaged_task(allocator_arg_t __tag, const _Allocator& __a, _Fn __fn)
-        : _M_state(std::allocate_shared<_State_type>(__a, std::move(__fn)))
+        packaged_task(allocator_arg_t, const _Allocator& __a, _Fn&& __fn)
+        : _M_state(std::allocate_shared<_State_type>(__a,
+                                                     std::forward<_Fn>(__fn)))
         { }
 
       ~packaged_task()

diff --git a/libstdc++-v3/testsuite/30_threads/future/members/share.cc b/libstdc++-v3/testsuite/30_threads/future/members/share.cc
new file mode 100644 (file)
index 0000000..e37cb77
--- /dev/null
+++ b/libstdc++-v3/testsuite/30_threads/future/members/share.cc
@@ -0,0 +1,73 @@
+// { dg-do run { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-solaris* *-*-cygwin *-*-darwin* alpha*-*-osf* mips-sgi-irix6* } }
+// { dg-options " -std=gnu++0x -pthread" { target *-*-freebsd* *-*-netbsd* *-*-linux* alpha*-*-osf* mips-sgi-irix6* } }
+// { dg-options " -std=gnu++0x -pthreads" { target *-*-solaris* } }
+// { dg-options " -std=gnu++0x " { target *-*-cygwin *-*-darwin* } }
+// { dg-require-cstdint "" }
+// { dg-require-gthreads "" }
+// { dg-require-atomic-builtins "" }
+
+// Copyright (C) 2011 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+
+#include <future>
+#include <testsuite_hooks.h>
+
+int value = 99;
+
+void test01()
+{
+  bool test __attribute__((unused)) = true;
+
+  std::promise<int> p1;
+  std::future<int> f1(p1.get_future());
+  std::shared_future<int> f2 = f1.share();
+
+  p1.set_value(value);
+  VERIFY( f2.get() == value );
+}
+
+void test02()
+{
+  bool test __attribute__((unused)) = true;
+
+  std::promise<int&> p1;
+  std::future<int&> f1(p1.get_future());
+  std::shared_future<int&> f2 = f1.share();
+
+  p1.set_value(value);
+  VERIFY( &f2.get() == &value );
+}
+
+void test03()
+{
+  std::promise<void> p1;
+  std::future<void> f1(p1.get_future());
+  std::shared_future<void> f2 = f1.share();
+
+  p1.set_value();
+  f2.get();
+}
+
+int main()
+{
+  test01();
+  test02();
+  test03();
+
+  return 0;
+}

diff --git a/libstdc++-v3/testsuite/30_threads/packaged_task/requirements/typedefs.cc b/libstdc++-v3/testsuite/30_threads/packaged_task/requirements/typedefs.cc
deleted file mode 100644 (file)
index 3c83a3f..0000000
--- a/libstdc++-v3/testsuite/30_threads/packaged_task/requirements/typedefs.cc
+++ /dev/null
@@ -1,31 +0,0 @@
-// { dg-do compile }
-// { dg-options "-std=gnu++0x" }
-// { dg-require-cstdint "" }
-// { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
-
-// Copyright (C) 2009 Free Software Foundation
-//
-// This file is part of the GNU ISO C++ Library.  This library is free
-// software; you can redistribute it and/or modify it under the
-// terms of the GNU General Public License as published by the
-// Free Software Foundation; either version 3, or (at your option)
-// any later version.
-
-// This library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License along
-// with this library; see the file COPYING3.  If not see
-// <http://www.gnu.org/licenses/>.
-
-#include <future>
-
-void test01()
-{
-  // Check for required typedefs
-  typedef std::packaged_task<int()>    test_type;
-  typedef test_type::result_type       result_type;
-}