123 lines
4.0 KiB
C++
123 lines
4.0 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 auto begin()
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// requires (!(simple-view<V> &&
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// random_access_range<const V> && sized_range<const V>));
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// constexpr auto begin() const
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// requires random_access_range<const V> && sized_range<const V>;
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#include <ranges>
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#include "test_macros.h"
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#include "test_iterators.h"
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#include "types.h"
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template<class T>
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concept BeginInvocable = requires(std::ranges::drop_view<T> t) { t.begin(); };
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template <bool IsSimple>
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struct MaybeSimpleView : std::ranges::view_base {
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int* num_of_non_const_begin_calls;
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int* num_of_const_begin_calls;
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constexpr int* begin() {
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++(*num_of_non_const_begin_calls);
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return nullptr;
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}
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constexpr std::conditional_t<IsSimple, int*, const int*> begin() const {
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++(*num_of_const_begin_calls);
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return nullptr;
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}
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constexpr int* end() const { return nullptr; }
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constexpr size_t size() const { return 0; }
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};
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using SimpleView = MaybeSimpleView<true>;
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using NonSimpleView = MaybeSimpleView<false>;
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constexpr bool test() {
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// random_access_range<const V> && sized_range<const V>
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std::ranges::drop_view dropView1(MoveOnlyView(), 4);
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assert(dropView1.begin() == globalBuff + 4);
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// !random_access_range<const V>
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std::ranges::drop_view dropView2(ForwardView(), 4);
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assert(base(dropView2.begin()) == globalBuff + 4);
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// !random_access_range<const V>
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std::ranges::drop_view dropView3(InputView(), 4);
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assert(base(dropView3.begin()) == globalBuff + 4);
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// random_access_range<const V> && sized_range<const V>
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std::ranges::drop_view dropView4(MoveOnlyView(), 8);
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assert(dropView4.begin() == globalBuff + 8);
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// random_access_range<const V> && sized_range<const V>
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std::ranges::drop_view dropView5(MoveOnlyView(), 0);
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assert(dropView5.begin() == globalBuff);
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// random_access_range<const V> && sized_range<const V>
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const std::ranges::drop_view dropView6(MoveOnlyView(), 0);
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assert(dropView6.begin() == globalBuff);
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// random_access_range<const V> && sized_range<const V>
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std::ranges::drop_view dropView7(MoveOnlyView(), 10);
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assert(dropView7.begin() == globalBuff + 8);
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CountedView view8;
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std::ranges::drop_view dropView8(view8, 5);
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assert(base(base(dropView8.begin())) == globalBuff + 5);
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assert(dropView8.begin().stride_count() == 5);
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assert(base(base(dropView8.begin())) == globalBuff + 5);
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assert(dropView8.begin().stride_count() == 5);
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static_assert(!BeginInvocable<const ForwardView>);
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{
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static_assert(std::ranges::random_access_range<const SimpleView>);
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static_assert(std::ranges::sized_range<const SimpleView>);
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LIBCPP_STATIC_ASSERT(std::ranges::__simple_view<SimpleView>);
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int non_const_calls = 0;
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int const_calls = 0;
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std::ranges::drop_view dropView(SimpleView{{}, &non_const_calls, &const_calls}, 4);
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assert(dropView.begin() == nullptr);
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assert(non_const_calls == 0);
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assert(const_calls == 1);
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assert(std::as_const(dropView).begin() == nullptr);
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assert(non_const_calls == 0);
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assert(const_calls == 2);
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}
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{
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static_assert(std::ranges::random_access_range<const NonSimpleView>);
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static_assert(std::ranges::sized_range<const NonSimpleView>);
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LIBCPP_STATIC_ASSERT(!std::ranges::__simple_view<NonSimpleView>);
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int non_const_calls = 0;
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int const_calls = 0;
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std::ranges::drop_view dropView(NonSimpleView{{}, &non_const_calls, &const_calls}, 4);
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assert(dropView.begin() == nullptr);
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assert(non_const_calls == 1);
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assert(const_calls == 0);
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assert(std::as_const(dropView).begin() == nullptr);
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assert(non_const_calls == 1);
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assert(const_calls == 1);
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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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