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 10 // <optional> 11 12 // template <class T, class U> constexpr bool operator<= (const optional<T>& x, const optional<U>& y); 13 14 #include <optional> 15 16 #include "test_macros.h" 17 18 using std::optional; 19 20 struct X { 21 int i_; 22 23 constexpr X(int i) : i_(i) {} 24 }; 25 26 constexpr bool operator<=(const X& lhs, const X& rhs) { 27 return lhs.i_ <= rhs.i_; 28 } 29 30 int main(int, char**) { 31 { 32 typedef optional<X> O; 33 34 constexpr O o1; // disengaged 35 constexpr O o2; // disengaged 36 constexpr O o3{1}; // engaged 37 constexpr O o4{2}; // engaged 38 constexpr O o5{1}; // engaged 39 40 static_assert((o1 <= o1), ""); 41 static_assert((o1 <= o2), ""); 42 static_assert((o1 <= o3), ""); 43 static_assert((o1 <= o4), ""); 44 static_assert((o1 <= o5), ""); 45 46 static_assert((o2 <= o1), ""); 47 static_assert((o2 <= o2), ""); 48 static_assert((o2 <= o3), ""); 49 static_assert((o2 <= o4), ""); 50 static_assert((o2 <= o5), ""); 51 52 static_assert(!(o3 <= o1), ""); 53 static_assert(!(o3 <= o2), ""); 54 static_assert((o3 <= o3), ""); 55 static_assert((o3 <= o4), ""); 56 static_assert((o3 <= o5), ""); 57 58 static_assert(!(o4 <= o1), ""); 59 static_assert(!(o4 <= o2), ""); 60 static_assert(!(o4 <= o3), ""); 61 static_assert((o4 <= o4), ""); 62 static_assert(!(o4 <= o5), ""); 63 64 static_assert(!(o5 <= o1), ""); 65 static_assert(!(o5 <= o2), ""); 66 static_assert((o5 <= o3), ""); 67 static_assert((o5 <= o4), ""); 68 static_assert((o5 <= o5), ""); 69 } 70 { 71 using O1 = optional<int>; 72 using O2 = optional<long>; 73 constexpr O1 o1(42); 74 static_assert(o1 <= O2(42), ""); 75 static_assert(!(O2(101) <= o1), ""); 76 } 77 { 78 using O1 = optional<int>; 79 using O2 = optional<const int>; 80 constexpr O1 o1(42); 81 static_assert(o1 <= O2(42), ""); 82 static_assert(!(O2(101) <= o1), ""); 83 } 84 85 return 0; 86 } 87