libcxx/test/std/iterators/predef.iterators/counted.iterator/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 // constexpr counted_iterator() requires default_initializable<I> = default;
  12
  13 #include <iterator>
  14
  15 #include "test_macros.h"
  16 #include "test_iterators.h"
  17
  18 constexpr bool test() {
  19   static_assert(!std::default_initializable<std::counted_iterator<cpp17_input_iterator<int*>>>);
  20   static_assert( std::default_initializable<std::counted_iterator<forward_iterator<int*>>>);
  21
  22   std::counted_iterator<forward_iterator<int*>> iter;
  23   assert(iter.base() == forward_iterator<int*>());
  24   assert(iter.count() == 0);
  25
  26   return true;
  27 }
  28
  29 int main(int, char**) {
  30   test();
  31   static_assert(test());
  32
  33   return 0;
  34 }