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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
// constexpr auto data() requires contiguous_range<R>
// constexpr auto data() const requires contiguous_range<const R>
#include <ranges>
#include <array>
#include <cassert>
#include <concepts>
#include "test_iterators.h"
#include "test_macros.h"
template <class T>
concept HasData = requires (T t) {
t.data();
};
constexpr bool test()
{
{
struct ContiguousIters {
contiguous_iterator<int*> begin();
sentinel_wrapper<contiguous_iterator<int*>> end();
};
using OwningView = std::ranges::owning_view<ContiguousIters>;
static_assert(std::ranges::contiguous_range<OwningView&>);
static_assert(!std::ranges::range<const OwningView&>); // no begin/end
static_assert(HasData<OwningView&>);
static_assert(HasData<OwningView&&>);
static_assert(!HasData<const OwningView&>);
static_assert(!HasData<const OwningView&&>);
}
{
struct NoData {
random_access_iterator<int*> begin();
random_access_iterator<int*> end();
};
using OwningView = std::ranges::owning_view<NoData>;
static_assert(!HasData<OwningView&>);
static_assert(!HasData<OwningView&&>);
static_assert(!HasData<const OwningView&>);
static_assert(!HasData<const OwningView&&>);
}
{
// Test a view.
int a[] = {1};
auto ov = std::ranges::owning_view(std::ranges::subrange(a, a+1));
assert(ov.data() == a);
assert(std::as_const(ov).data() == a);
}
{
// Test a non-view.
std::array<int, 2> a = {1, 2};
auto ov = std::ranges::owning_view(std::move(a));
assert(ov.data() != a.data()); // because it points into the copy
assert(std::as_const(ov).data() != a.data());
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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