1 // RUN: %clang_cc1 -fcxx-exceptions -fexceptions -fsyntax-only -verify -std=c++11 -ffreestanding %s
2 #include <stdint.h>
3
4 typedef decltype(nullptr) nullptr_t;
5
6 struct A {};
7
8 int o1(char*);
9 void o1(uintptr_t);
10 void o2(char*); // expected-note {{candidate}}
11 void o2(int A::*); // expected-note {{candidate}}
12
f(nullptr_t null)13 nullptr_t f(nullptr_t null)
14 {
15 // Implicit conversions.
16 null = nullptr;
17 void *p = nullptr;
18 p = null;
19 int *pi = nullptr;
20 pi = null;
21 null = 0;
22 int A::*pm = nullptr;
23 pm = null;
24 void (*pf)() = nullptr;
25 pf = null;
26 void (A::*pmf)() = nullptr;
27 pmf = null;
28 bool b = nullptr;
29
30 // Can't convert nullptr to integral implicitly.
31 uintptr_t i = nullptr; // expected-error {{cannot initialize}}
32
33 // Operators
34 (void)(null == nullptr);
35 (void)(null <= nullptr);
36 (void)(null == (void*)0);
37 (void)((void*)0 == nullptr);
38 (void)(null <= (void*)0);
39 (void)((void*)0 <= nullptr);
40 (void)(0 == nullptr);
41 (void)(nullptr == 0);
42 (void)(nullptr <= 0);
43 (void)(0 <= nullptr);
44 (void)(1 > nullptr); // expected-error {{invalid operands to binary expression}}
45 (void)(1 != nullptr); // expected-error {{invalid operands to binary expression}}
46 (void)(1 + nullptr); // expected-error {{invalid operands to binary expression}}
47 (void)(0 ? nullptr : 0); // expected-error {{non-pointer operand type 'int' incompatible with nullptr}}
48 (void)(0 ? nullptr : (void*)0);
49 (void)(0 ? nullptr : A()); // expected-error {{non-pointer operand type 'A' incompatible with nullptr}}
50 (void)(0 ? A() : nullptr); // expected-error {{non-pointer operand type 'A' incompatible with nullptr}}
51
52 // Overloading
53 int t = o1(nullptr);
54 t = o1(null);
55 o2(nullptr); // expected-error {{ambiguous}}
56
57 // nullptr is an rvalue, null is an lvalue
58 (void)&nullptr; // expected-error {{address expression must be an lvalue}}
59 nullptr_t *pn = &null;
60
61 // You can reinterpret_cast nullptr to an integer.
62 (void)reinterpret_cast<uintptr_t>(nullptr);
63 (void)reinterpret_cast<uintptr_t>(*pn);
64
65 int *ip = *pn;
66 if (*pn) { }
67
68 // You can throw nullptr.
69 throw nullptr;
70 }
71
72 // Template arguments can be nullptr.
73 template <int *PI, void (*PF)(), int A::*PM, void (A::*PMF)()>
74 struct T {};
75
76 typedef T<nullptr, nullptr, nullptr, nullptr> NT;
77
78 namespace test1 {
79 template<typename T, typename U> struct is_same {
80 static const bool value = false;
81 };
82
83 template<typename T> struct is_same<T, T> {
84 static const bool value = true;
85 };
86
87 void *g(void*);
88 bool g(bool);
89
90 // Test that we prefer g(void*) over g(bool).
91 static_assert(is_same<decltype(g(nullptr)), void*>::value, "");
92 }
93
94 namespace test2 {
95 void f(int, ...) __attribute__((sentinel));
96
g()97 void g() {
98 // nullptr can be used as the sentinel value.
99 f(10, nullptr);
100 }
101 }
102
103 namespace test3 {
104 void f(const char*, ...) __attribute__((format(printf, 1, 2)));
105
g()106 void g() {
107 // Don't warn when using nullptr with %p.
108 f("%p", nullptr);
109 }
110 }
111
112 static_assert(__is_scalar(nullptr_t), "");
113 static_assert(__is_pod(nullptr_t), "");
114 static_assert(sizeof(nullptr_t) == sizeof(void*), "");
115
116 static_assert(!(nullptr < nullptr), "");
117 static_assert(!(nullptr > nullptr), "");
118 static_assert( nullptr <= nullptr, "");
119 static_assert( nullptr >= nullptr, "");
120 static_assert( nullptr == nullptr, "");
121 static_assert(!(nullptr != nullptr), "");
122
123 static_assert(!(0 < nullptr), "");
124 static_assert(!(0 > nullptr), "");
125 static_assert( 0 <= nullptr, "");
126 static_assert( 0 >= nullptr, "");
127 static_assert( 0 == nullptr, "");
128 static_assert(!(0 != nullptr), "");
129
130 static_assert(!(nullptr < 0), "");
131 static_assert(!(nullptr > 0), "");
132 static_assert( nullptr <= 0, "");
133 static_assert( nullptr >= 0, "");
134 static_assert( nullptr == 0, "");
135 static_assert(!(nullptr != 0), "");
136
137 namespace overloading {
138 int &f1(int*);
139 float &f1(bool);
140
test_f1()141 void test_f1() {
142 int &ir = (f1)(nullptr);
143 }
144
145 struct ConvertsToNullPtr {
146 operator nullptr_t() const;
147 };
148
test_conversion(ConvertsToNullPtr ctn)149 void test_conversion(ConvertsToNullPtr ctn) {
150 (void)(ctn == ctn);
151 (void)(ctn != ctn);
152 (void)(ctn <= ctn);
153 (void)(ctn >= ctn);
154 (void)(ctn < ctn);
155 (void)(ctn > ctn);
156 }
157 }
158
159 namespace templates {
160 template<typename T, nullptr_t Value>
161 struct X {
Xtemplates::X162 X() { ptr = Value; }
163
164 T *ptr;
165 };
166
167 X<int, nullptr> x;
168
169
170 template<int (*fp)(int), int* p, int A::* pmd, int (A::*pmf)(int)>
171 struct X2 {};
172
173 X2<nullptr, nullptr, nullptr, nullptr> x2;
174 }
175
176 namespace null_pointer_constant {
177
178 // Pending implementation of core issue 903, ensure we don't allow any of the
179 // C++11 constant evaluation semantics in null pointer constants.
180 struct S { int n; };
null()181 constexpr int null() { return 0; }
182 void *p = S().n; // expected-error {{cannot initialize}}
183 void *q = null(); // expected-error {{cannot initialize}}
184
185 }
186