libcxx/test/std/strings/string.view/string.view.cons/from_string.pass.cpp

   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
   9 // UNSUPPORTED: !stdlib=libc++ && (c++03 || c++11 || c++14)
  10
  11 // <string_view>
  12
  13 // template<class Allocator>
  14 // basic_string_view(const basic_string<_CharT, _Traits, Allocator>& _str) noexcept
  15
  16 #include <string_view>
  17 #include <string>
  18 #include <cassert>
  19
  20 #include "test_macros.h"
  21
  22 struct dummy_char_traits : public std::char_traits<char> {};
  23
  24 template <typename CharT, typename Traits>
  25 void test(const std::basic_string<CharT, Traits>& str) {
  26   typedef std::basic_string_view<CharT, Traits> SV;
  27   ASSERT_NOEXCEPT(SV(str));
  28
  29   SV sv1(str);
  30   assert(sv1.size() == str.size());
  31   assert(sv1.data() == str.data());
  32 }
  33
  34 int main(int, char**) {
  35   test(std::string("QBCDE"));
  36   test(std::string(""));
  37   test(std::string());
  38
  39 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  40   test(std::wstring(L"QBCDE"));
  41   test(std::wstring(L""));
  42   test(std::wstring());
  43 #endif
  44
  45 #ifndef TEST_HAS_NO_CHAR8_T
  46   test(std::u8string{u8"QBCDE"});
  47   test(std::u8string{u8""});
  48   test(std::u8string{});
  49 #endif
  50
  51 #if TEST_STD_VER >= 11
  52   test(std::u16string{u"QBCDE"});
  53   test(std::u16string{u""});
  54   test(std::u16string{});
  55
  56   test(std::u32string{U"QBCDE"});
  57   test(std::u32string{U""});
  58   test(std::u32string{});
  59 #endif
  60
  61   test(std::basic_string<char, dummy_char_traits>("QBCDE"));
  62   test(std::basic_string<char, dummy_char_traits>(""));
  63   test(std::basic_string<char, dummy_char_traits>());
  64
  65   return 0;
  66 }