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> struct hash<optional<T>>; 14 15 #include <optional> 16 #include <string> 17 #include <memory> 18 #include <cassert> 19 20 #include "poisoned_hash_helper.hpp" 21 22 struct A {}; 23 struct B {}; 24 25 namespace std { 26 27 template <> 28 struct hash<B> { 29 size_t operator()(B const&) TEST_NOEXCEPT_FALSE { return 0; } 30 }; 31 32 } 33 34 int main() 35 { 36 using std::optional; 37 const std::size_t nullopt_hash = 38 std::hash<optional<double>>{}(optional<double>{}); 39 40 41 { 42 optional<B> opt; 43 ASSERT_NOT_NOEXCEPT(std::hash<optional<B>>()(opt)); 44 ASSERT_NOT_NOEXCEPT(std::hash<optional<const B>>()(opt)); 45 } 46 47 { 48 typedef int T; 49 optional<T> opt; 50 assert(std::hash<optional<T>>{}(opt) == nullopt_hash); 51 opt = 2; 52 assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt)); 53 } 54 { 55 typedef std::string T; 56 optional<T> opt; 57 assert(std::hash<optional<T>>{}(opt) == nullopt_hash); 58 opt = std::string("123"); 59 assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt)); 60 } 61 { 62 typedef std::unique_ptr<int> T; 63 optional<T> opt; 64 assert(std::hash<optional<T>>{}(opt) == nullopt_hash); 65 opt = std::unique_ptr<int>(new int(3)); 66 assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt)); 67 } 68 { 69 test_hash_enabled_for_type<std::optional<int> >(); 70 test_hash_enabled_for_type<std::optional<int*> >(); 71 test_hash_enabled_for_type<std::optional<const int> >(); 72 test_hash_enabled_for_type<std::optional<int* const> >(); 73 74 test_hash_disabled_for_type<std::optional<A>>(); 75 test_hash_disabled_for_type<std::optional<const A>>(); 76 77 test_hash_enabled_for_type<std::optional<B>>(); 78 test_hash_enabled_for_type<std::optional<const B>>(); 79 } 80 } 81
