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 test()18constexpr 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 main(int,char **)29int main(int, char**) { 30 test(); 31 static_assert(test()); 32 33 return 0; 34 } 35