PR libstdc++/80796 Add new std::search overload for C++17

	PR libstdc++/80796
	* include/bits/stl_algo.h (search): Add new overload for C++17.
	* testsuite/25_algorithms/search/searcher.cc: New.

From-SVN: r248266

libstdc++-v3/ChangeLog

+2017-05-19  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/80796
+	* include/bits/stl_algo.h (search): Add new overload for C++17.
+	* testsuite/25_algorithms/search/searcher.cc: New.
+
 2017-05-18  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR libstdc++/80478

libstdc++-v3/include/bits/stl_algo.h

@@ -4258,6 +4258,20 @@ _GLIBCXX_BEGIN_NAMESPACE_ALGO
 		__gnu_cxx::__ops::__iter_comp_val(__binary_pred, __val));
     }
 
+#if __cplusplus > 201402L
+  /** @brief Search a sequence using a Searcher object.
+   *
+   *  @param  __first        A forward iterator.
+   *  @param  __last         A forward iterator.
+   *  @param  __searcher     A callable object.
+   *  @return @p __searcher(__first,__last).first
+  */
+  template<typename _ForwardIterator, typename _Searcher>
+    inline _ForwardIterator
+    search(_ForwardIterator __first, _ForwardIterator __last,
+	   const _Searcher& __searcher)
+    { return __searcher(__first, __last).first; }
+#endif
 
   /**
    *  @brief Perform an operation on a sequence.

libstdc++-v3/testsuite/25_algorithms/search/searcher.cc

+// Copyright (C) 2017 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/>.
+
+// { dg-options "-std=gnu++17" }
+// { dg-do run { target c++1z } }
+
+#include <algorithm>
+#include <testsuite_hooks.h>
+
+struct nocopy
+{
+  nocopy() = default;
+  nocopy(const nocopy&) = delete;
+  nocopy& operator=(const nocopy&) = delete;
+
+  struct P { int* first; };
+
+  P operator()(int* f, int* l) const { return {f}; }
+};
+
+void
+test01()
+{
+  int i[] = { 1, 2 };
+  auto res = std::search(i, i + 2, nocopy{});
+  VERIFY( res == i );
+}
+
+int
+main()
+{
+  test01();
+}