forked from OSchip/llvm-project
61 lines
1.7 KiB
C++
61 lines
1.7 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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// constexpr iterator<false> begin();
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// constexpr iterator<true> begin() const
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// requires range<const V> &&
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// regular_invocable<const F&, range_reference_t<const V>>;
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#include <ranges>
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#include "test_macros.h"
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#include "types.h"
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template<class T>
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concept BeginInvocable = requires(T t) { t.begin(); };
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constexpr bool test() {
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int buff[8] = {0, 1, 2, 3, 4, 5, 6, 7};
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{
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std::ranges::transform_view transformView(MoveOnlyView{buff}, PlusOneMutable{});
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assert(transformView.begin().base() == buff);
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assert(*transformView.begin() == 1);
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}
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{
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std::ranges::transform_view transformView(ForwardView{buff}, PlusOneMutable{});
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assert(base(transformView.begin().base()) == buff);
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assert(*transformView.begin() == 1);
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}
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{
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std::ranges::transform_view transformView(InputView{buff}, PlusOneMutable{});
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assert(base(transformView.begin().base()) == buff);
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assert(*transformView.begin() == 1);
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}
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{
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const std::ranges::transform_view transformView(MoveOnlyView{buff}, PlusOne{});
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assert(*transformView.begin() == 1);
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}
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static_assert(!BeginInvocable<const std::ranges::transform_view<MoveOnlyView, PlusOneMutable>>);
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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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