1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// UNSUPPORTED: c++98, c++03, c++11
11
12// <propagate_const>
13
14// template <class T> constexpr bool operator==(const propagate_const<T>& x, const propagate_const<T>& y);
15// template <class T> constexpr bool operator==(const T& x, const propagate_const<T>& y);
16// template <class T> constexpr bool operator==(const propagate_const<T>& x, const T& y);
17
18#include <experimental/propagate_const>
19#include "propagate_const_helpers.h"
20#include <cassert>
21
22using std::experimental::propagate_const;
23using std::nullptr_t;
24
25constexpr bool operator==(const X &lhs, const X &rhs) {
26  return lhs.i_ == rhs.i_;
27}
28
29constexpr bool operator==(const X &, const nullptr_t &) {
30  return false;
31}
32
33constexpr bool operator==(const nullptr_t &, const X &) {
34  return false;
35}
36
37int main() {
38  constexpr X x1_1(1);
39  constexpr X x2_1(1);
40  constexpr X x3_2(2);
41
42  static_assert(x1_1 == x1_1, "");
43  static_assert(x1_1 == x2_1, "");
44  static_assert(!(x1_1 == x3_2), "");
45
46  typedef propagate_const<X> P;
47
48  constexpr P p1_1(1);
49  constexpr P p2_1(1);
50  constexpr P p3_2(2);
51
52  static_assert(p1_1 == p1_1, "");
53  static_assert(p1_1 == p2_1, "");
54  static_assert(!(p1_1 == p3_2), "");
55
56  static_assert(x1_1 == p1_1, "");
57  static_assert(!(x1_1 == p3_2), "");
58
59  static_assert(p1_1 == x1_1, "");
60  static_assert(!(p1_1 == x3_2), "");
61
62  static_assert(!(p1_1==nullptr),"");
63  static_assert(!(nullptr==p1_1),"");
64}
65