57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// take_while_view() requires default_initializable<V> && default_initializable<Pred> = default;
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#include <cassert>
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#include <ranges>
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#include <type_traits>
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template <bool defaultInitable>
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struct View : std::ranges::view_base {
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int i;
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constexpr explicit View()
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requires defaultInitable
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= default;
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int* begin() const;
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int* end() const;
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};
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template <bool defaultInitable>
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struct Pred {
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int i;
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constexpr explicit Pred()
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requires defaultInitable
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= default;
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bool operator()(int) const;
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};
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// clang-format off
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static_assert( std::is_default_constructible_v<std::ranges::take_while_view<View<true >, Pred<true >>>);
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static_assert(!std::is_default_constructible_v<std::ranges::take_while_view<View<false>, Pred<true >>>);
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static_assert(!std::is_default_constructible_v<std::ranges::take_while_view<View<true >, Pred<false>>>);
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static_assert(!std::is_default_constructible_v<std::ranges::take_while_view<View<false>, Pred<false>>>);
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// clang-format on
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constexpr bool test() {
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{
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std::ranges::take_while_view<View<true>, Pred<true>> twv = {};
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assert(twv.base().i == 0);
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assert(twv.pred().i == 0);
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}
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return true;
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}
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int main(int, char**) {
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test();
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static_assert(test());
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return 0;
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}
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