50 lines
1.2 KiB
C++
50 lines
1.2 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
|
|
|
|
// constexpr take_while_view(V base, Pred pred);
|
|
|
|
#include <cassert>
|
|
#include <ranges>
|
|
#include <type_traits>
|
|
#include <utility>
|
|
|
|
#include "MoveOnly.h"
|
|
|
|
struct View : std::ranges::view_base {
|
|
MoveOnly mo;
|
|
int* begin() const;
|
|
int* end() const;
|
|
};
|
|
|
|
struct Pred {
|
|
bool copied = false;
|
|
bool moved = false;
|
|
constexpr Pred() = default;
|
|
constexpr Pred(Pred&&) : moved(true) {}
|
|
constexpr Pred(const Pred&) : copied(true) {}
|
|
bool operator()(int) const;
|
|
};
|
|
|
|
constexpr bool test() {
|
|
{
|
|
std::ranges::take_while_view<View, Pred> twv = {View{{}, MoveOnly{5}}, Pred{}};
|
|
assert(twv.pred().moved);
|
|
assert(!twv.pred().copied);
|
|
assert(std::move(twv).base().mo.get() == 5);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
int main(int, char**) {
|
|
test();
|
|
static_assert(test());
|
|
return 0;
|
|
}
|