| //===----------------------------------------------------------------------===// |
| // |
| // 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 filter_view(View, Pred); // explicit since C++23 |
| |
| #include <cassert> |
| #include <ranges> |
| #include <utility> |
| |
| #include "test_convertible.h" |
| #include "test_macros.h" |
| #include "types.h" |
| |
| struct Range : std::ranges::view_base { |
| constexpr explicit Range(int* b, int* e) : begin_(b), end_(e) { } |
| constexpr int* begin() const { return begin_; } |
| constexpr int* end() const { return end_; } |
| |
| private: |
| int* begin_; |
| int* end_; |
| }; |
| |
| struct Pred { |
| constexpr bool operator()(int i) const { return i % 2 != 0; } |
| }; |
| |
| struct TrackingPred : TrackInitialization { |
| using TrackInitialization::TrackInitialization; |
| constexpr bool operator()(int) const; |
| }; |
| |
| struct TrackingRange : TrackInitialization, std::ranges::view_base { |
| using TrackInitialization::TrackInitialization; |
| int* begin() const; |
| int* end() const; |
| }; |
| |
| // SFINAE tests. |
| |
| #if TEST_STD_VER >= 23 |
| |
| static_assert(!test_convertible<std::ranges::filter_view<Range, Pred>, Range, Pred>(), |
| "This constructor must be explicit"); |
| |
| #else |
| |
| static_assert( test_convertible<std::ranges::filter_view<Range, Pred>, Range, Pred>(), |
| "This constructor must not be explicit"); |
| |
| #endif // TEST_STD_VER >= 23 |
| |
| constexpr bool test() { |
| int buff[] = {1, 2, 3, 4, 5, 6, 7, 8}; |
| |
| // Test explicit syntax |
| { |
| Range range(buff, buff + 8); |
| Pred pred; |
| std::ranges::filter_view<Range, Pred> view(range, pred); |
| auto it = view.begin(), end = view.end(); |
| assert(*it++ == 1); |
| assert(*it++ == 3); |
| assert(*it++ == 5); |
| assert(*it++ == 7); |
| assert(it == end); |
| } |
| |
| // Make sure we move the view |
| { |
| bool moved = false, copied = false; |
| TrackingRange range(&moved, &copied); |
| Pred pred; |
| [[maybe_unused]] std::ranges::filter_view<TrackingRange, Pred> view(std::move(range), pred); |
| assert(moved); |
| assert(!copied); |
| } |
| |
| // Make sure we move the predicate |
| { |
| bool moved = false, copied = false; |
| Range range(buff, buff + 8); |
| TrackingPred pred(&moved, &copied); |
| [[maybe_unused]] std::ranges::filter_view<Range, TrackingPred> view(range, std::move(pred)); |
| assert(moved); |
| assert(!copied); |
| } |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| |
| return 0; |
| } |