libcxx/test/std/ranges/range.factories/range.single.view/ctor.value.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: c++03, c++11, c++14, c++17
  10
  11 // constexpr explicit single_view(const T& t);
  12 // constexpr explicit single_view(T&& t);
  13
  14 #include <cassert>
  15 #include <ranges>
  16 #include <utility>
  17
  18 #include "test_macros.h"
  19
  20 struct Empty {};
  21 struct BigType { char buffer[64] = {10}; };
  22
  23 constexpr bool test() {
  24   {
  25     BigType bt;
  26     std::ranges::single_view<BigType> sv(bt);
  27     assert(sv.data()->buffer[0] == 10);
  28     assert(sv.size() == 1);
  29   }
  30   {
  31     const BigType bt;
  32     const std::ranges::single_view<BigType> sv(bt);
  33     assert(sv.data()->buffer[0] == 10);
  34     assert(sv.size() == 1);
  35   }
  36
  37   {
  38     BigType bt;
  39     std::ranges::single_view<BigType> sv(std::move(bt));
  40     assert(sv.data()->buffer[0] == 10);
  41     assert(sv.size() == 1);
  42   }
  43   {
  44     const BigType bt;
  45     const std::ranges::single_view<BigType> sv(std::move(bt));
  46     assert(sv.data()->buffer[0] == 10);
  47     assert(sv.size() == 1);
  48   }
  49
  50   return true;
  51 }
  52
  53 int main(int, char**) {
  54   test();
  55   static_assert(test());
  56
  57   return 0;
  58 }