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 // UNSUPPORTED: libcpp-no-concepts
10 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
11 
12 // <string_view>
13 
14 //  template<class Range>
15 //    basic_string_view(Range&&) -> basic_string_view<ranges::range_value_t<Range>>; // C++23
16 
17 #include <string_view>
18 #include <cassert>
19 
20 #include "make_string.h"
21 #include "test_iterators.h"
22 #include "test_macros.h"
23 
24 template<class CharT>
25 void test() {
26   auto val = MAKE_STRING(CharT, "test");
27   auto sv = std::basic_string_view(val);
28   ASSERT_SAME_TYPE(decltype(sv), std::basic_string_view<CharT>);
29   assert(sv.size() == val.size());
30   assert(sv.data() == val.data());
31 }
32 
33 void test() {
34   test<char>();
35 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
36   test<wchar_t>();
37 #endif
38   test<char8_t>();
39   test<char16_t>();
40   test<char32_t>();
41   test<char>();
42 
43   struct Widget {
44     const char16_t *data_ = u"foo";
45     contiguous_iterator<const char16_t*> begin() const { return contiguous_iterator<const char16_t*>(data_); }
46     contiguous_iterator<const char16_t*> end() const { return contiguous_iterator<const char16_t*>(data_ + 3); }
47   };
48   std::basic_string_view bsv = Widget();
49   ASSERT_SAME_TYPE(decltype(bsv), std::basic_string_view<char16_t>);
50 }
51 
52 int main(int, char**) {
53   test();
54 
55   return 0;
56 }
57 
58