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libstdc++: Improve tests for constexpr algorithms
[thirdparty/gcc.git] / libstdc++-v3 / testsuite / 25_algorithms / find_end / constexpr.cc
1 // Copyright (C) 2019-2020 Free Software Foundation, Inc.
2 //
3 // This file is part of the GNU ISO C++ Library. This library is free
4 // software; you can redistribute it and/or modify it under the
5 // terms of the GNU General Public License as published by the
6 // Free Software Foundation; either version 3, or (at your option)
7 // any later version.
8
9 // This library is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
13
14 // You should have received a copy of the GNU General Public License along
15 // with this library; see the file COPYING3. If not see
16 // <http://www.gnu.org/licenses/>.
17
18 // { dg-options "-std=gnu++2a" }
19 // { dg-do compile { target c++2a } }
20
21 #include <algorithm>
22 #include <array>
23
24 constexpr bool
25 test()
26 {
27 constexpr std::array<int, 12> ca0{{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}};
28 constexpr std::array<int, 3> cam{{4, 5, 6}};
29 constexpr std::array<int, 3> camm{{-4, -5, -6}};
30
31 const auto outf = std::find_end(ca0.begin(), ca0.end(),
32 cam.begin(), cam.end());
33
34 const auto outg = std::find_end(ca0.begin(), ca0.end(),
35 camm.begin(), camm.end(),
36 [](int i, int j){ return i + 1 == -j; });
37
38 return outf == (ca0.begin() + 4) && outg == (ca0.begin() + 3);
39 }
40
41 static_assert(test());