1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // UNSUPPORTED: c++03, c++11, c++14, c++17
10
11 // template<class R, class Pred>
12 // take_while_view(R&&, Pred) -> take_while_view<views::all_t<R>, Pred>;
13
14 #include <cassert>
15 #include <ranges>
16 #include <utility>
17
18 #include "types.h"
19
20 struct Container {
21 int* begin() const;
22 int* end() const;
23 };
24
25 struct View : std::ranges::view_base {
26 int* begin() const;
27 int* end() const;
28 };
29
30 struct Pred {
31 bool operator()(int i) const;
32 };
33
34 bool pred(int);
35
36 static_assert(std::is_same_v<decltype(std::ranges::take_while_view(Container{}, Pred{})),
37 std::ranges::take_while_view<std::ranges::owning_view<Container>, Pred>>);
38
39 static_assert(std::is_same_v<decltype(std::ranges::take_while_view(View{}, pred)), //
40 std::ranges::take_while_view<View, bool (*)(int)>>);
41
42 static_assert(std::is_same_v<decltype(std::ranges::take_while_view(View{}, Pred{})), //
43 std::ranges::take_while_view<View, Pred>>);
44
testRef()45 void testRef() {
46 Container c{};
47 Pred p{};
48 static_assert(std::is_same_v<decltype(std::ranges::take_while_view(c, p)),
49 std::ranges::take_while_view<std::ranges::ref_view<Container>, Pred>>);
50 }
51