Pretty self-explanatory.
Ed
2019-11-15 Edward Smith-Rowland <3dw...@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.
Index: include/std/functional
===================================================================
--- include/std/functional (revision 278302)
+++ include/std/functional (working copy)
@@ -1000,6 +1000,7 @@
class default_searcher
{
public:
+ _GLIBCXX20_CONSTEXPR
default_searcher(_ForwardIterator1 __pat_first,
_ForwardIterator1 __pat_last,
_BinaryPredicate __pred = _BinaryPredicate())
@@ -1007,7 +1008,8 @@
{ }
template<typename _ForwardIterator2>
- pair<_ForwardIterator2, _ForwardIterator2>
+ _GLIBCXX20_CONSTEXPR
+ pair<_ForwardIterator2, _ForwardIterator2>
operator()(_ForwardIterator2 __first, _ForwardIterator2 __last) const
{
_ForwardIterator2 __first_ret =
Index: testsuite/20_util/function_objects/constexpr_searcher.cc
===================================================================
--- testsuite/20_util/function_objects/constexpr_searcher.cc (nonexistent)
+++ testsuite/20_util/function_objects/constexpr_searcher.cc (working copy)
@@ -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());
