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 22 using std::experimental::propagate_const; 23 using std::nullptr_t; 24 25 constexpr bool operator==(const X &lhs, const X &rhs) { 26 return lhs.i_ == rhs.i_; 27 } 28 29 constexpr bool operator==(const X &, const nullptr_t &) { 30 return false; 31 } 32 33 constexpr bool operator==(const nullptr_t &, const X &) { 34 return false; 35 } 36 37 int 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
