libcxx/test/std/strings/string.view/string.view.cons/assign.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 // constexpr basic_string_view& operator=(const basic_string_view &) noexcept = default;
  14
  15 #include <string_view>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19
  20 template <typename T>
  21 #if TEST_STD_VER > 11
  22 constexpr
  23 #endif
  24     bool
  25     test(T sv0) {
  26   T sv1;
  27   sv1 = sv0;
  28   //  We can't just say "sv0 == sv1" here because string_view::compare
  29   //  isn't constexpr until C++17, and we want to support back to C++14
  30   return sv0.size() == sv1.size() && sv0.data() == sv1.data();
  31 }
  32
  33 int main(int, char**) {
  34   assert(test<std::string_view>("1234"));
  35 #ifndef TEST_HAS_NO_CHAR8_T
  36   assert(test<std::u8string_view>(u8"1234"));
  37 #endif
  38 #if TEST_STD_VER >= 11
  39   assert(test<std::u16string_view>(u"1234"));
  40   assert(test<std::u32string_view>(U"1234"));
  41 #endif
  42 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  43   assert(test<std::wstring_view>(L"1234"));
  44 #endif
  45
  46 #if TEST_STD_VER > 11
  47   static_assert(test<std::string_view>({"abc", 3}), "");
  48 #  ifndef TEST_HAS_NO_CHAR8_T
  49   static_assert(test<std::u8string_view>({u8"abc", 3}), "");
  50 #  endif
  51   static_assert(test<std::u16string_view>({u"abc", 3}), "");
  52   static_assert(test<std::u32string_view>({U"abc", 3}), "");
  53 #  ifndef TEST_HAS_NO_WIDE_CHARACTERS
  54   static_assert(test<std::wstring_view>({L"abc", 3}), "");
  55 #  endif
  56 #endif
  57
  58   return 0;
  59 }