libcxx/test/std/strings/string.view/string.view.cons/default.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 () noexcept;
  14
  15 #include <string_view>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19
  20 template <typename T>
  21 void test() {
  22 #if TEST_STD_VER > 11
  23   {
  24     ASSERT_NOEXCEPT(T());
  25
  26     constexpr T sv1;
  27     static_assert(sv1.size() == 0, "");
  28     static_assert(sv1.empty(), "");
  29   }
  30 #endif
  31
  32   {
  33     T sv1;
  34     assert(sv1.size() == 0);
  35     assert(sv1.empty());
  36   }
  37 }
  38
  39 int main(int, char**) {
  40   test<std::string_view>();
  41   test<std::u16string_view>();
  42 #ifndef TEST_HAS_NO_CHAR8_T
  43   test<std::u8string_view>();
  44 #endif
  45   test<std::u32string_view>();
  46 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  47   test<std::wstring_view>();
  48 #endif
  49
  50   return 0;
  51 }