1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
9
10// <string_view>
11
12// template<class Range>
13// basic_string_view(Range&&) -> basic_string_view<ranges::range_value_t<Range>>; // C++23
14
15#include <string_view>
16#include <cassert>
17
18#include "make_string.h"
19#include "test_iterators.h"
20#include "test_macros.h"
21
22template <class CharT>
23void test() {
24 auto val = MAKE_STRING(CharT, "test");
25 auto sv = std::basic_string_view(val);
26 ASSERT_SAME_TYPE(decltype(sv), std::basic_string_view<CharT>);
27 assert(sv.size() == val.size());
28 assert(sv.data() == val.data());
29}
30
31void test() {
32 test<char>();
33#ifndef TEST_HAS_NO_WIDE_CHARACTERS
34 test<wchar_t>();
35#endif
36 test<char8_t>();
37 test<char16_t>();
38 test<char32_t>();
39 test<char>();
40
41 struct Widget {
42 const char16_t* data_ = u"foo";
43 contiguous_iterator<const char16_t*> begin() const { return contiguous_iterator<const char16_t*>(data_); }
44 contiguous_iterator<const char16_t*> end() const { return contiguous_iterator<const char16_t*>(data_ + 3); }
45 };
46 std::basic_string_view bsv = std::basic_string_view(Widget());
47 ASSERT_SAME_TYPE(decltype(bsv), std::basic_string_view<char16_t>);
48}
49
50int main(int, char**) {
51 test();
52
53 return 0;
54}
55

source code of libcxx/test/std/strings/string.view/string.view.deduct/range.pass.cpp