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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
// std::ranges::as_rvalue_view::as_rvalue_view(...)
#include <cassert>
#include <ranges>
#include <vector>
struct DefaultConstructibleView : std::ranges::view_base {
int* begin() const;
int* end() const;
int i_ = 23;
};
struct NonDefaultConstructibleView : std::ranges::view_base {
NonDefaultConstructibleView(int i) : i_(i) {}
int* begin() const;
int* end() const;
int i_ = 23;
};
static_assert(!std::is_constructible_v<std::ranges::as_rvalue_view<NonDefaultConstructibleView>>);
static_assert(std::is_constructible_v<std::ranges::as_rvalue_view<NonDefaultConstructibleView>, int>);
static_assert(std::is_nothrow_constructible_v<std::ranges::as_rvalue_view<DefaultConstructibleView>>);
template <class T, class... Args>
concept IsImplicitlyConstructible = requires(T val, Args... args) { val = {std::forward<Args>(args)...}; };
static_assert(IsImplicitlyConstructible<std::ranges::as_rvalue_view<DefaultConstructibleView>>);
static_assert(!IsImplicitlyConstructible<std::ranges::as_rvalue_view<NonDefaultConstructibleView>, int>);
constexpr bool test() {
std::ranges::as_rvalue_view<DefaultConstructibleView> view = {};
assert(view.base().i_ == 23);
return true;
}
int main(int, char**) {
static_assert(test());
test();
return 0;
}
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