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 run { target c++2a } }
20
21 #include <functional>
22 #include <testsuite_hooks.h>
23
24 // C++20 [range.cmp]
25
26 using F = std::ranges::greater;
27 static_assert( std::is_default_constructible_v<F> );
28 static_assert( std::is_copy_constructible_v<F> );
29 static_assert( std::is_move_constructible_v<F> );
30 static_assert( std::is_copy_assignable_v<F> );
31 static_assert( std::is_move_assignable_v<F> );
32
33 static_assert( ! std::is_invocable_v<F> );
34 static_assert( ! std::is_invocable_v<F, int&> );
35 static_assert( ! std::is_invocable_v<F, int, void> );
36 static_assert( ! std::is_invocable_v<F, int, void*> );
37 static_assert( std::is_nothrow_invocable_r_v<bool, F&, int&, int> );
38 static_assert( std::is_nothrow_invocable_r_v<bool, F, const long&, char> );
39 static_assert( std::is_nothrow_invocable_r_v<bool, const F&, short, int&> );
40 static_assert( std::is_nothrow_invocable_r_v<bool, const F, const char, char> );
41
42 using T = F::is_transparent; // required typedef
43
44 static_assert( ! std::ranges::greater{}(99, 99.0) );
45 static_assert( std::ranges::greater{}(99.01, 99) );
46 static_assert( std::ranges::greater{}(990, 140L) );
47
48 void
test01()49 test01()
50 {
51 F f;
52 int a[2]{};
53 VERIFY( ! f(&a, (void*)&a[0]) );
54 VERIFY( f((void*)&a[1], &a) );
55 VERIFY( f(&a + 1, (void*)(a + 1)) );
56 VERIFY( ! f(&a, (void*)(a + 1)) );
57 }
58
59 struct X { };
operator ==(X,X)60 int operator==(X, X) { return 2; }
operator !=(X,X)61 int operator!=(X, X) { return 0; }
operator <(X,X)62 int operator<(X, X) noexcept { return 0; }
operator >(X,X)63 int operator>(X, X) { return 0; }
operator <=(X,X)64 int operator<=(X, X) { return 3; }
operator >=(X,X)65 int operator>=(X, X) { return 4; }
66
67 static_assert( std::is_nothrow_invocable_r_v<bool, F&, X, X> );
68
69 void
test02()70 test02()
71 {
72 X x;
73 F f;
74 VERIFY( ! f(x, x) );
75 }
76
77 int
main()78 main()
79 {
80 test01();
81 test02();
82 }
83