libcxx/test/std/ranges/range.factories/range.iota.view/iterator/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 iterator(W value);
  12
  13 #include <cassert>
  14 #include <ranges>
  15 #include <type_traits>
  16
  17 #include "test_macros.h"
  18 #include "../types.h"
  19
  20 constexpr bool test() {
  21   {
  22     using Iter = std::ranges::iterator_t<std::ranges::iota_view<int>>;
  23     auto iter = Iter(42);
  24     assert(*iter == 42);
  25   }
  26   {
  27     using Iter = std::ranges::iterator_t<std::ranges::iota_view<SomeInt>>;
  28     auto iter = Iter(SomeInt(42));
  29     assert(*iter == SomeInt(42));
  30   }
  31   {
  32     using Iter = std::ranges::iterator_t<std::ranges::iota_view<SomeInt>>;
  33     static_assert(!std::is_convertible_v<Iter, SomeInt>);
  34     static_assert( std::is_constructible_v<Iter, SomeInt>);
  35   }
  36
  37   return true;
  38 }
  39
  40 int main(int, char**) {
  41   test();
  42   static_assert(test());
  43
  44   return 0;
  45 }