b40a3d73dc
Reviewed By: ldionne, var-const, #libc Spies: libcxx-commits Differential Revision: https://reviews.llvm.org/D137637
100 lines
3.5 KiB
C++
100 lines
3.5 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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
|
|
|
|
// std::views::as_rvalue
|
|
|
|
#include <cassert>
|
|
#include <functional>
|
|
#include <ranges>
|
|
#include <vector>
|
|
|
|
#include "test_iterators.h"
|
|
|
|
struct DefaultConstructibleView : std::ranges::view_base {
|
|
int i_;
|
|
int* begin();
|
|
int* end();
|
|
};
|
|
|
|
struct RValueView : std::ranges::view_base {};
|
|
|
|
template <class View, class T>
|
|
concept HasPipe = requires(View&& view, T&& t) {
|
|
{ std::forward<View>(view) | std::forward<T>(t) };
|
|
};
|
|
|
|
struct NoView {};
|
|
static_assert(std::is_invocable_v<decltype(std::views::as_rvalue), DefaultConstructibleView>);
|
|
static_assert(!std::is_invocable_v<decltype(std::views::as_rvalue)>);
|
|
static_assert(!std::is_invocable_v<decltype(std::views::as_rvalue), NoView>);
|
|
static_assert(HasPipe<DefaultConstructibleView&, decltype(std::views::as_rvalue)>);
|
|
static_assert(HasPipe<int (&)[10], decltype(std::views::as_rvalue)>);
|
|
static_assert(!HasPipe<int (&&)[10], decltype(std::views::as_rvalue)>);
|
|
static_assert(!HasPipe<NoView, decltype(std::views::as_rvalue)>);
|
|
static_assert(std::is_same_v<decltype(std::views::as_rvalue), decltype(std::ranges::views::as_rvalue)>);
|
|
|
|
struct move_iterator_range {
|
|
constexpr std::move_iterator<int*> begin() const { return {}; }
|
|
constexpr std::move_iterator<int*> end() const { return {}; }
|
|
};
|
|
|
|
static_assert(!std::ranges::view<move_iterator_range>);
|
|
static_assert(std::ranges::range<move_iterator_range>);
|
|
|
|
constexpr bool test() {
|
|
{ // view | views::as_rvalue
|
|
DefaultConstructibleView v{{}, 3};
|
|
std::same_as<std::ranges::as_rvalue_view<DefaultConstructibleView>> decltype(auto) view = v | std::views::as_rvalue;
|
|
assert(view.base().i_ == 3);
|
|
}
|
|
|
|
{ // adaptor | views::as_rvalue
|
|
DefaultConstructibleView v{{}, 3};
|
|
const auto partial = std::views::transform(std::identity{}) | std::views::as_rvalue;
|
|
std::same_as<std::ranges::as_rvalue_view<
|
|
std::ranges::transform_view<DefaultConstructibleView, std::identity>>> decltype(auto) view = partial(v);
|
|
assert(view.base().base().i_ == 3);
|
|
}
|
|
|
|
{ // views::as_rvalue | adaptor
|
|
DefaultConstructibleView v{{}, 3};
|
|
const auto partial = std::views::as_rvalue | std::views::transform(std::identity{});
|
|
std::same_as<std::ranges::transform_view<std::ranges::as_rvalue_view<DefaultConstructibleView>,
|
|
std::identity>> decltype(auto) view = partial(v);
|
|
assert(view.base().base().i_ == 3);
|
|
}
|
|
|
|
{ // rvalue-view | views::as_rvalue
|
|
int a[4] = {1, 2, 3, 4};
|
|
std::ranges::subrange range(rvalue_iterator{a}, rvalue_iterator{a + 4});
|
|
[[maybe_unused]] std::same_as<std::ranges::subrange<rvalue_iterator<int>>> decltype(auto) rval_range =
|
|
range | std::views::as_rvalue;
|
|
}
|
|
|
|
{ // range | views::as_rvalue
|
|
[[maybe_unused]] std::same_as<std::ranges::as_rvalue_view<std::views::all_t<std::vector<int>>>> decltype(auto)
|
|
view = std::vector<int>{} | std::views::as_rvalue;
|
|
}
|
|
|
|
{ // rvalue-range | views::as_rvalue
|
|
[[maybe_unused]] std::same_as<std::views::all_t<move_iterator_range>> decltype(auto) view =
|
|
move_iterator_range{} | std::views::as_rvalue;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
int main(int, char**) {
|
|
test();
|
|
static_assert(test());
|
|
|
|
return 0;
|
|
}
|