2019-11-15 Edward Smith-Rowland <3dw4rd@verizon.net>

	Implement the default_searcher part of C++20 p1032 Misc constexpr bits.
	* include/std/functional
	(default_searcher, default_searcher::operator()): Constexpr.
	* testsuite/20_util/function_objects/constexpr_searcher.cc: New.



git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@278317 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 52 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/20_util/function_objects/constexpr_searcher.cc b/libstdc++-v3/testsuite/20_util/function_objects/constexpr_searcher.cc
new file mode 100644
index 00000000000..e9fc0fc2204
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/function_objects/constexpr_searcher.cc
@@ -0,0 +1,52 @@
+// Copyright (C) 2014-2019 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++2a" }
+// { dg-do compile { target c++2a } }
+
+#include <functional>
+#include <string_view>
+
+const std::string_view
+patt = "World";
+
+constexpr std::string_view
+greet = "Hello, Humongous World of Wonder!!!";
+
+const std::wstring_view
+wpatt = L"World";
+
+constexpr std::wstring_view
+wgreet = L"Hello, Humongous World of Wonder!!!";
+
+constexpr bool
+test_searcher()
+{
+  auto ok = true;
+
+  const std::default_searcher search(patt.begin(), patt.end(),
+				     std::equal_to<>());
+  const auto find = search(greet.begin(), greet.end());
+
+  const std::default_searcher wsearch(wpatt.begin(), wpatt.end(),
+				      std::equal_to<>());
+  const auto wfind = wsearch(wgreet.begin(), wgreet.end());
+
+  return ok;
+}
+
+static_assert(test_searcher());