forked from OSchip/llvm-project
123 lines
3.9 KiB
C++
123 lines
3.9 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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// UNSUPPORTED: libcpp-no-concepts
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// UNSUPPORTED: libcpp-has-no-incomplete-ranges
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// constexpr auto begin();
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// constexpr auto begin() const;
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#include <cassert>
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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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struct NonSimpleParentView : std::ranges::view_base {
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ChildView* begin() { return nullptr; }
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const ChildView* begin() const;
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const ChildView* end() const;
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};
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struct SimpleParentView : std::ranges::view_base {
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const ChildView* begin() const;
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const ChildView* end() const;
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};
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constexpr bool test() {
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int buffer[4][4] = {{1111, 2222, 3333, 4444}, {555, 666, 777, 888}, {99, 1010, 1111, 1212}, {13, 14, 15, 16}};
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{
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ChildView children[4] = {ChildView(buffer[0]), ChildView(buffer[1]), ChildView(buffer[2]), ChildView(buffer[3])};
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auto jv = std::ranges::join_view(ParentView{children});
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assert(*jv.begin() == 1111);
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}
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{
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CopyableChild children[4] = {CopyableChild(buffer[0], 4), CopyableChild(buffer[1], 0), CopyableChild(buffer[2], 1), CopyableChild(buffer[3], 0)};
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auto jv = std::ranges::join_view(ParentView{children});
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assert(*jv.begin() == 1111);
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}
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// Parent is empty.
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{
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CopyableChild children[4] = {CopyableChild(buffer[0]), CopyableChild(buffer[1]), CopyableChild(buffer[2]), CopyableChild(buffer[3])};
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std::ranges::join_view jv(ParentView(children, 0));
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assert(jv.begin() == jv.end());
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}
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// Parent size is one.
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{
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CopyableChild children[1] = {CopyableChild(buffer[0])};
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std::ranges::join_view jv(ParentView(children, 1));
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assert(*jv.begin() == 1111);
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}
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// Parent and child size is one.
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{
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CopyableChild children[1] = {CopyableChild(buffer[0], 1)};
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std::ranges::join_view jv(ParentView(children, 1));
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assert(*jv.begin() == 1111);
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}
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// Parent size is one child is empty
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{
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CopyableChild children[1] = {CopyableChild(buffer[0], 0)};
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std::ranges::join_view jv(ParentView(children, 1));
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assert(jv.begin() == jv.end());
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}
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// Has all empty children.
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{
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CopyableChild children[4] = {CopyableChild(buffer[0], 0), CopyableChild(buffer[1], 0), CopyableChild(buffer[2], 0), CopyableChild(buffer[3], 0)};
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auto jv = std::ranges::join_view(ParentView{children});
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assert(jv.begin() == jv.end());
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}
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// First child is empty, others are not.
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{
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CopyableChild children[4] = {CopyableChild(buffer[0], 4), CopyableChild(buffer[1], 0), CopyableChild(buffer[2], 0), CopyableChild(buffer[3], 0)};
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auto jv = std::ranges::join_view(ParentView{children});
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assert(*jv.begin() == 1111);
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}
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// Last child is empty, others are not.
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{
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CopyableChild children[4] = {CopyableChild(buffer[0], 4), CopyableChild(buffer[1], 4), CopyableChild(buffer[2], 4), CopyableChild(buffer[3], 0)};
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auto jv = std::ranges::join_view(ParentView{children});
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assert(*jv.begin() == 1111);
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}
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{
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std::ranges::join_view jv(buffer);
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assert(*jv.begin() == 1111);
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}
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{
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const std::ranges::join_view jv(buffer);
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assert(*jv.begin() == 1111);
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}
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// !simple-view<V>
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{
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std::ranges::join_view<NonSimpleParentView> jv;
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static_assert(!std::same_as<decltype(jv.begin()),
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decltype(std::as_const(jv).begin())>);
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}
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// simple-view<V> && is_reference_v<range_reference_t<V>>;
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{
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std::ranges::join_view<SimpleParentView> jv;
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static_assert(std::same_as<decltype(jv.begin()),
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decltype(std::as_const(jv).begin())>);
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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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