equal.pass.cpp (2218B)
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, c++14 11 // <optional> 12 13 // template <class T, class U> constexpr bool operator==(const optional<T>& x, const optional<U>& y); 14 15 #include <optional> 16 #include <type_traits> 17 #include <cassert> 18 19 using std::optional; 20 21 struct X { 22 int i_; 23 24 constexpr X(int i) : i_(i) {} 25 }; 26 27 constexpr bool operator==(const X& lhs, const X& rhs) { 28 return lhs.i_ == rhs.i_; 29 } 30 31 int main() { 32 { 33 typedef X T; 34 typedef optional<T> O; 35 36 constexpr O o1; // disengaged 37 constexpr O o2; // disengaged 38 constexpr O o3{1}; // engaged 39 constexpr O o4{2}; // engaged 40 constexpr O o5{1}; // engaged 41 42 static_assert(o1 == o1, ""); 43 static_assert(o1 == o2, ""); 44 static_assert(!(o1 == o3), ""); 45 static_assert(!(o1 == o4), ""); 46 static_assert(!(o1 == o5), ""); 47 48 static_assert(o2 == o1, ""); 49 static_assert(o2 == o2, ""); 50 static_assert(!(o2 == o3), ""); 51 static_assert(!(o2 == o4), ""); 52 static_assert(!(o2 == o5), ""); 53 54 static_assert(!(o3 == o1), ""); 55 static_assert(!(o3 == o2), ""); 56 static_assert(o3 == o3, ""); 57 static_assert(!(o3 == o4), ""); 58 static_assert(o3 == o5, ""); 59 60 static_assert(!(o4 == o1), ""); 61 static_assert(!(o4 == o2), ""); 62 static_assert(!(o4 == o3), ""); 63 static_assert(o4 == o4, ""); 64 static_assert(!(o4 == o5), ""); 65 66 static_assert(!(o5 == o1), ""); 67 static_assert(!(o5 == o2), ""); 68 static_assert(o5 == o3, ""); 69 static_assert(!(o5 == o4), ""); 70 static_assert(o5 == o5, ""); 71 } 72 { 73 using O1 = optional<int>; 74 using O2 = optional<long>; 75 constexpr O1 o1(42); 76 static_assert(o1 == O2(42), ""); 77 static_assert(!(O2(101) == o1), ""); 78 } 79 { 80 using O1 = optional<int>; 81 using O2 = optional<const int>; 82 constexpr O1 o1(42); 83 static_assert(o1 == O2(42), ""); 84 static_assert(!(O2(101) == o1), ""); 85 } 86 }