libcxx/test/std/strings/string.view/char.bad.verify.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 //   ... manipulating sequences of any non-array trivial standard-layout types.
  13
  14 #include <string>
  15 #include "../basic.string/test_traits.h"
  16
  17 struct NotTrivial {
  18   NotTrivial() : value(3) {}
  19   int value;
  20 };
  21
  22 struct NotStandardLayout {
  23 public:
  24   NotStandardLayout() : one(1), two(2) {}
  25   int sum() const { return one + two; } // silences "unused field 'two' warning"
  26   int one;
  27
  28 private:
  29   int two;
  30 };
  31
  32 int main(int, char**) {
  33   {
  34     //  array
  35     typedef char C[3];
  36     static_assert(std::is_array<C>::value, "");
  37     std::basic_string_view<C, test_traits<C> > sv;
  38     //  expected-error-re@string_view:* {{static assertion failed{{.*}}Character type of basic_string_view must not be an array}}
  39   }
  40
  41   {
  42     //  not trivial
  43     static_assert(!std::is_trivial<NotTrivial>::value, "");
  44     std::basic_string_view<NotTrivial, test_traits<NotTrivial> > sv;
  45     //  expected-error-re@string_view:* {{static assertion failed{{.*}}Character type of basic_string_view must be trivial}}
  46   }
  47
  48   {
  49     //  not standard layout
  50     static_assert(!std::is_standard_layout<NotStandardLayout>::value, "");
  51     std::basic_string_view<NotStandardLayout, test_traits<NotStandardLayout> > sv;
  52     //  expected-error-re@string_view:* {{static assertion failed{{.*}}Character type of basic_string_view must be standard-layout}}
  53   }
  54
  55   return 0;
  56 }