Implement std::experimental::fundamentals_v2::make_array and…

Implement std::experimental::fundamentals_v2::make_array and std::experimental::fundamentals_v2::to_array.

2015-08-13  Ville Voutilainen  <ville.voutilainen@gmail.com>

	Implement std::experimental::fundamentals_v2::make_array and
	std::experimental::fundamentals_v2::to_array.
	* include/Makefile.am: Add array.
	* include/Makefile.in: Add array.
	* include/experimental/array: New.
	* testsuite/experimental/array/make_array.cc: Likewise.
	* testsuite/experimental/array/neg.cc: Likewise.
	* doc/html/manual/status.html: Mark make_array as Y.
	* doc/xml/manual/status_cxx2017.xml: Likewise.

From-SVN: r226865

libstdc++-v3/ChangeLog

+2015-08-13  Ville Voutilainen  <ville.voutilainen@gmail.com>
+
+	Implement std::experimental::fundamentals_v2::make_array and
+	std::experimental::fundamentals_v2::to_array.
+	* include/Makefile.am: Add array.
+	* include/Makefile.in: Add array.
+	* include/experimental/array: New.
+	* testsuite/experimental/array/make_array.cc: Likewise.
+	* testsuite/experimental/array/neg.cc: Likewise.
+	* doc/html/manual/status.html: Mark make_array as Y.
+	* doc/xml/manual/status_cxx2017.xml: Likewise.
+
 2015-08-13  Jonathan Wakely  <jwakely@redhat.com>
 
 	* include/bits/alloc_traits.h: Add feature-test macro.

libstdc++-v3/doc/html/manual/status.html

@@ -563,7 +563,7 @@ not in any particular release.
 	<a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4391.html" target="_top">
 	  N4391
 	</a>
-      </td><td align="left"> <code class="code">make_array</code>, revision 4 </td><td align="left">Y (not committed yet)</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left">
+      </td><td align="left"> <code class="code">make_array</code>, revision 4 </td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left">
 	<a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4502.pdf" target="_top">
 	  N4502
 	</a>

libstdc++-v3/doc/xml/manual/status_cxx2017.xml

@@ -316,7 +316,7 @@ not in any particular release.
 	</link>
       </entry>
       <entry> <code>make_array</code>, revision 4 </entry>
-      <entry>Y (not committed yet)</entry>
+      <entry>Y</entry>
       <entry>Library Fundamentals 2 TS</entry>
     </row>
 

libstdc++-v3/include/Makefile.am

@@ -646,6 +646,7 @@ experimental_builddir = ./experimental
 experimental_headers = \
 	${experimental_srcdir}/algorithm \
 	${experimental_srcdir}/any \
+	${experimental_srcdir}/array \
 	${experimental_srcdir}/chrono \
 	${experimental_srcdir}/deque \
 	${experimental_srcdir}/erase_if.h \

libstdc++-v3/include/Makefile.in

@@ -935,6 +935,7 @@ experimental_builddir = ./experimental
 experimental_headers = \
 	${experimental_srcdir}/algorithm \
 	${experimental_srcdir}/any \
+	${experimental_srcdir}/array \
 	${experimental_srcdir}/chrono \
 	${experimental_srcdir}/deque \
 	${experimental_srcdir}/erase_if.h \

libstdc++-v3/include/experimental/array

+// <experimental/array> -*- C++ -*-
+
+// Copyright (C) 2015 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.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file experimental/array
+ *  This is a TS C++ Library header.
+ */
+
+#ifndef _GLIBCXX_EXPERIMENTAL_ARRAY
+#define _GLIBCXX_EXPERIMENTAL_ARRAY 1
+
+#pragma GCC system_header
+
+#if __cplusplus <= 201103L
+# include <bits/c++14_warning.h>
+#else
+
+#include <array>
+#include <functional>
+#include <experimental/type_traits>
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+namespace experimental
+{
+inline namespace fundamentals_v2
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  /**
+   * @defgroup make_array Array creation functions
+   * @ingroup experimental
+   *
+   * Array creation functions as described in N4529,
+   * Working Draft, C++ Extensions for Library Fundamentals, Version 2
+   *
+   * @{
+   */
+
+template <typename _Up>
+  struct __is_reference_wrapper : false_type
+  {};
+
+template <typename _Up>
+  struct __is_reference_wrapper<reference_wrapper<_Up>> : true_type
+  {};
+
+template <typename _Dest = void, typename... _Types>
+  constexpr auto
+  make_array(_Types&&... __t)
+    -> array<conditional_t<is_void_v<_Dest>,
+                           common_type_t<_Types...>,
+                           _Dest>,
+             sizeof...(_Types)>
+  {
+    static_assert(__or_<
+                  __not_<is_void<_Dest>>,
+                  __and_<__not_<__is_reference_wrapper<decay_t<_Types>>>...>>
+                  ::value,
+                  "make_array cannot be used without an explicit target type "
+                  "if any of the types given is a reference_wrapper");
+    return {{forward<_Types>(__t)...}};
+  }
+
+template <typename _Tp, size_t _Nm, size_t... _Idx>
+  constexpr array<remove_cv_t<_Tp>, _Nm>
+  __to_array(_Tp (&__a)[_Nm],
+             index_sequence<_Idx...>)
+  {
+    return {{__a[_Idx]...}};
+  }
+
+template <typename _Tp, size_t _Nm>
+  constexpr array<remove_cv_t<_Tp>, _Nm>
+  to_array(_Tp (&__a)[_Nm])
+  {
+    return __to_array(__a, make_index_sequence<_Nm>{});
+  }
+
+  // @} group make_array
+  _GLIBCXX_END_NAMESPACE_VERSION
+} // namespace fundamentals_v2
+} // namespace experimental
+
+} // namespace std
+
+#endif // C++14
+
+#endif // _GLIBCXX_EXPERIMENTAL_ARRAY

libstdc++-v3/testsuite/experimental/array/make_array.cc

+// { dg-options "-std=gnu++14" }
+// { dg-do compile }
+
+// Copyright (C) 2015 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 moved_to of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <experimental/array>
+
+struct MoveOnly
+{
+  MoveOnly() = default;
+  MoveOnly(MoveOnly&&) = default;
+  MoveOnly& operator=(MoveOnly&&) = default;
+};
+
+int main()
+{
+  char x[42];
+  std::array<char, 42> y = std::experimental::to_array(x);
+  std::array<int, 5> z = std::experimental::make_array(1,2,3,4,5);
+  std::array<long, 3> zz = std::experimental::make_array(1,2L, 3);
+  std::array<MoveOnly, 1> zzz = std::experimental::make_array(MoveOnly{});
+  int dummy;
+  auto good = std::experimental::make_array<
+    std::reference_wrapper<int>>(std::ref(dummy));
+  constexpr char x2[42]{};
+  constexpr std::array<char, 42> y2 = std::experimental::to_array(x2);
+  constexpr std::array<int, 5> z2 =
+    std::experimental::make_array(1,2,3,4,5);
+  constexpr std::array<long, 3> zz2
+    = std::experimental::make_array(1,2L, 3);
+  constexpr std::array<MoveOnly, 1> zzz2 = std::experimental::make_array(MoveOnly{});
+}

libstdc++-v3/testsuite/experimental/array/neg.cc

+// { dg-options "-std=gnu++14" }
+// { dg-do compile }
+
+// Copyright (C) 2015 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 moved_to of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <experimental/array>
+
+int main()
+{
+  int dummy;
+  auto bad = std::experimental::make_array(std::ref(dummy));
+  // { dg-error "make_array cannot be used without an explicit target type if any of the types given is a reference_wrapper" "" { target *-*-* } 76 }
+}

libstdc++-v3/testsuite/experimental/array/neg.s

+	.file	"neg.cc"