| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17 |
| |
| // constexpr explicit inner-iterator::inner-iterator(outer-iterator<Const> i); |
| |
| #include <ranges> |
| |
| #include "../types.h" |
| |
| static_assert(!std::is_constructible_v<InnerIterNonConst, OuterIterConst>); |
| |
| template <class Inner, class Outer> |
| constexpr void test_impl() { |
| [[maybe_unused]] Inner i(Outer{}); |
| // Verify that the constructor is `explicit`. |
| static_assert(!std::is_convertible_v<Outer, Inner>); |
| } |
| |
| constexpr bool test() { |
| test_impl<InnerIterForward, OuterIterForward>(); |
| test_impl<InnerIterInput, OuterIterInput>(); |
| // Is only constructible if both the outer and the inner iterators have the same constness. |
| test_impl<InnerIterConst, OuterIterConst>(); |
| // Note: this works because of an implicit conversion (`OuterIterNonConst` is converted to `OuterIterConst`). |
| test_impl<InnerIterConst, OuterIterNonConst>(); |
| test_impl<InnerIterNonConst, OuterIterNonConst>(); |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| |
| return 0; |
| } |