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
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// UNSUPPORTED: libcpp-no-concepts
// UNSUPPORTED: gcc-10
// ranges::prev
// Make sure we're SFINAE-friendly when the template argument constraints are not met.
#include <iterator>
#include <cstddef>
#include <utility>
#include "test_iterators.h"
template <class ...Args>
concept has_ranges_prev = requires (Args&& ...args) {
{ std::ranges::prev(std::forward<Args>(args)...) };
};
using It = forward_iterator<int*>;
static_assert(!has_ranges_prev<It>);
static_assert(!has_ranges_prev<It, std::ptrdiff_t>);
static_assert(!has_ranges_prev<It, std::ptrdiff_t, It>);
// Test the test
using It2 = bidirectional_iterator<int*>;
static_assert(has_ranges_prev<It2>);
static_assert(has_ranges_prev<It2, std::ptrdiff_t>);
static_assert(has_ranges_prev<It2, std::ptrdiff_t, It2>);
|
