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 9 // UNSUPPORTED: libcpp-no-concepts 10 11 // <string_view> 12 13 // template <contiguous_iterator _It, sized_sentinel_for<_It> _End> 14 // basic_string_view(_It, _End) -> basic_string_view<iter_value_t<_It>>; 15 16 #include <string_view> 17 #include <cassert> 18 19 #include "make_string.h" 20 #include "test_macros.h" 21 #include "test_iterators.h" 22 23 template<class It, class Sentinel, class CharT> 24 constexpr void test_ctad(std::basic_string_view<CharT> val) { 25 auto sv = std::basic_string_view(It(val.data()), Sentinel(It(val.data() + val.size()))); 26 ASSERT_SAME_TYPE(decltype(sv), std::basic_string_view<CharT>); 27 assert(sv.data() == val.data()); 28 assert(sv.size() == val.size()); 29 } 30 31 template<class CharT> 32 constexpr void test_with_char() { 33 const auto val = MAKE_STRING_VIEW(CharT, "test"); 34 test_ctad<CharT*, CharT*>(val); 35 test_ctad<CharT*, const CharT*>(val); 36 test_ctad<const CharT*, CharT*>(val); 37 test_ctad<const CharT*, sized_sentinel<const CharT*>>(val); 38 test_ctad<contiguous_iterator<const CharT*>, contiguous_iterator<const CharT*>>(val); 39 test_ctad<contiguous_iterator<const CharT*>, sized_sentinel<contiguous_iterator<const CharT*>>>(val); 40 } 41 42 constexpr void test() { 43 test_with_char<char>(); 44 #ifndef TEST_HAS_NO_WIDE_CHARACTERS 45 test_with_char<wchar_t>(); 46 #endif 47 test_with_char<char8_t>(); 48 test_with_char<char16_t>(); 49 test_with_char<char32_t>(); 50 } 51 52 int main(int, char**) { 53 test(); 54 55 return 0; 56 } 57