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//===----------------------------------------------------------------------===//
//
// 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, c++20
// <ranges>
// constexpr chunk_by_view(View, Pred);
#include <ranges>
#include <algorithm>
#include <array>
#include <cassert>
#include <utility>
#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_;
};
static_assert(std::ranges::view<Range>);
static_assert(std::ranges::forward_range<Range>);
struct Pred {
constexpr bool operator()(int x, int y) const { return x <= y; }
};
struct TrackingPred : TrackInitialization {
using TrackInitialization::TrackInitialization;
constexpr bool operator()(int&, int&) const;
};
struct TrackingRange : TrackInitialization, std::ranges::view_base {
using TrackInitialization::TrackInitialization;
int* begin() const;
int* end() const;
};
template <class T>
void implicitConstructionTest(T);
template <class T, class... Args>
concept ImplicitConstructibleFrom =
requires(Args&&... args) { implicitConstructionTest({std::forward<Args>(args)...}); };
constexpr bool test() {
int buff[] = {1, 2, 3, 0, 1, 2, -1, -1, 0};
// Test explicit syntax
{
Range range(buff, buff + 9);
Pred pred;
std::ranges::chunk_by_view<Range, Pred> view(range, pred);
auto it = view.begin(), end = view.end();
assert(std::ranges::equal(*it++, std::array{1, 2, 3}));
assert(std::ranges::equal(*it++, std::array{0, 1, 2}));
assert(std::ranges::equal(*it++, std::array{-1, -1, 0}));
assert(it == end);
}
// Test implicit syntax
{
using ChunkByView = std::ranges::chunk_by_view<Range, Pred>;
static_assert(!ImplicitConstructibleFrom<ChunkByView, Range, Pred>);
static_assert(!ImplicitConstructibleFrom<ChunkByView, const Range&, const Pred&>);
}
// Make sure we move the view
{
bool moved = false, copied = false;
TrackingRange range(&moved, &copied);
Pred pred;
[[maybe_unused]] std::ranges::chunk_by_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 + 9);
TrackingPred pred(&moved, &copied);
[[maybe_unused]] std::ranges::chunk_by_view<Range, TrackingPred> view(range, std::move(pred));
assert(moved);
assert(!copied);
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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