libcxx/test/std/ranges/range.factories/range.iota.view/ctor.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: c++03, c++11, c++14, c++17
  10
  11 // iota_view() requires default_initializable<W> = default;
  12
  13 #include <ranges>
  14 #include <cassert>
  15
  16 #include "test_macros.h"
  17 #include "types.h"
  18
  19 constexpr bool test() {
  20   {
  21     std::ranges::iota_view<Int42<DefaultTo42>> io;
  22     assert((*io.begin()).value_ == 42);
  23   }
  24
  25   return true;
  26 }
  27
  28 int main(int, char**) {
  29   test();
  30   static_assert(test());
  31
  32   static_assert(!std::default_initializable<Int42<ValueCtor>>);
  33   static_assert( std::default_initializable<Int42<DefaultTo42>>);
  34
  35   return 0;
  36 }