blob: 5e25ebe7989790e7a6854646d6f2103725405e8a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
// Copyright (C) 2020-2022 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=c++2a" }
// { dg-do compile { target c++2a } }
#include <ranges>
#include <limits>
void
test01()
{
// PR libstdc++/96042
using V = std::ranges::iota_view<long long, long long>;
// In strict -std=c++20 mode there is no integer wider than long long,
// so V's difference type is an integer-class type, [iterator.concept.winc].
// In practice this is either __int128 or __detail::__max_diff_type.
using D = std::ranges::range_difference_t<V>;
// Ensure that numeric_limits is correctly specialized for the type.
using L = std::numeric_limits<D>;
static_assert( L::is_specialized );
static_assert( L::is_signed );
static_assert( L::is_integer );
static_assert( L::is_exact );
static_assert( L::digits > std::numeric_limits<long long>::digits );
static_assert( L::digits10 == static_cast<int>(L::digits * 0.30103) );
static_assert( L::min() == (D(1) << L::digits) );
static_assert( L::max() == ~L::min() );
static_assert( L::lowest() == L::min() );
}
#ifdef __SIZEOF_INT128__
void
test02()
{
// When the target supports __int128 it can be used in iota_view
// even in strict mode where !integral<__int128>.
using V = std::ranges::iota_view<__int128, __int128>;
using D = std::ranges::range_difference_t<V>; // __detail::__max_diff_type
using L = std::numeric_limits<D>;
static_assert( L::is_specialized );
static_assert( L::is_signed );
static_assert( L::is_integer );
static_assert( L::is_exact );
static_assert( L::digits > std::numeric_limits<long long>::digits );
static_assert( L::digits10 == static_cast<int>(L::digits * 0.30103) );
static_assert( L::min() == (D(1) << L::digits) );
static_assert( L::max() == ~L::min() );
static_assert( L::lowest() == L::min() );
}
#endif
|
