1 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
2
3 struct pr12960 {
4 int begin;
foopr129605 void foo(int x) {
6 for (int& it : x) { // expected-error {{invalid range expression of type 'int'; no viable 'begin' function available}}
7 }
8 }
9 };
10
11 namespace std {
12 template<typename T>
begin(T && t)13 auto begin(T &&t) -> decltype(t.begin()) { return t.begin(); } // expected-note 4{{ignored: substitution failure}}
14 template<typename T>
end(T && t)15 auto end(T &&t) -> decltype(t.end()) { return t.end(); } // expected-note {{candidate template ignored: substitution failure [with T = }}
16
17 template<typename T>
begin(T && t)18 auto begin(T &&t) -> decltype(t.alt_begin()) { return t.alt_begin(); } // expected-note {{selected 'begin' template [with T = }} \
19 expected-note 4{{candidate template ignored: substitution failure [with T = }}
20 template<typename T>
end(T && t)21 auto end(T &&t) -> decltype(t.alt_end()) { return t.alt_end(); } // expected-note {{candidate template ignored: substitution failure [with T = }}
22
23 namespace inner {
24 // These should never be considered.
25 int begin(int);
26 int end(int);
27 }
28
29 using namespace inner;
30 }
31
32 struct A { // expected-note 2 {{candidate constructor}}
33 A();
34 int *begin(); // expected-note 3{{selected 'begin' function with iterator type 'int *'}} expected-note {{'begin' declared here}}
35 int *end();
36 };
37
38 struct B {
39 B();
40 int *alt_begin();
41 int *alt_end();
42 };
43
44 void f();
45 void f(int);
46
g()47 void g() {
48 for (int a : A())
49 A __begin;
50 for (char *a : A()) { // expected-error {{cannot initialize a variable of type 'char *' with an lvalue of type 'int'}}
51 }
52 for (char *a : B()) { // expected-error {{cannot initialize a variable of type 'char *' with an lvalue of type 'int'}}
53 }
54 // FIXME: Terrible diagnostic here. auto deduction should fail, but does not!
55 for (double a : f) { // expected-error {{cannot use type '<overloaded function type>' as a range}}
56 }
57 for (auto a : A()) {
58 }
59 for (auto a : B()) {
60 }
61 for (auto *a : A()) { // expected-error {{variable 'a' with type 'auto *' has incompatible initializer of type 'int'}}
62 }
63 // : is not a typo for :: here.
64 for (A NS:A()) { // expected-error {{no viable conversion from 'int' to 'A'}}
65 }
66 for (auto not_in_scope : not_in_scope) { // expected-error {{use of undeclared identifier 'not_in_scope'}}
67 }
68
69 for (auto a : A())
70 for (auto b : A()) {
71 __range.begin(); // expected-error {{use of undeclared identifier '__range'}}
72 ++__begin; // expected-error {{use of undeclared identifier '__begin'}}
73 --__end; // expected-error {{use of undeclared identifier '__end'}}
74 }
75
76 for (char c : "test")
77 ;
78 for (auto a : f()) // expected-error {{cannot use type 'void' as a range}}
79 ;
80
81 extern int incomplete[];
82 for (auto a : incomplete) // expected-error {{cannot use incomplete type 'int []' as a range}}
83 ;
84 extern struct Incomplete also_incomplete[2]; // expected-note {{forward declaration}}
85 for (auto &a : also_incomplete) // expected-error {{cannot use incomplete type 'struct Incomplete [2]' as a range}}
86 ;
87
88 struct VoidBegin {
89 void begin(); // expected-note {{selected 'begin' function with iterator type 'void'}}
90 void end();
91 };
92 for (auto a : VoidBegin()) // expected-error {{cannot use type 'void' as an iterator}}
93 ;
94
95 struct null_t {
96 operator int*();
97 };
98 struct Differ {
99 int *begin(); // expected-note {{selected 'begin' function with iterator type 'int *'}}
100 null_t end(); // expected-note {{selected 'end' function with iterator type 'null_t'}}
101 };
102 for (auto a : Differ()) // expected-error {{'begin' and 'end' must return the same type (got 'int *' and 'null_t')}}
103 ;
104
105 for (void f() : "error") // expected-error {{for range declaration must declare a variable}}
106 ;
107
108 for (extern int a : A()) {} // expected-error {{loop variable 'a' may not be declared 'extern'}}
109 for (static int a : A()) {} // expected-error {{loop variable 'a' may not be declared 'static'}}
110 for (register int a : A()) {} // expected-error {{loop variable 'a' may not be declared 'register'}}
111 for (constexpr int a : A()) {} // expected-error {{loop variable 'a' may not be declared 'constexpr'}}
112
113 struct NoBeginADL {
114 null_t alt_end();
115 };
116 struct NoEndADL {
117 null_t alt_begin();
118 };
119 for (auto u : NoBeginADL()) { // expected-error {{invalid range expression of type 'NoBeginADL'; no viable 'begin' function available}}
120 }
121 for (auto u : NoEndADL()) { // expected-error {{invalid range expression of type 'NoEndADL'; no viable 'end' function available}}
122 }
123
124 struct NoBegin {
125 null_t end();
126 };
127 struct NoEnd {
128 null_t begin();
129 };
130 for (auto u : NoBegin()) { // expected-error {{range type 'NoBegin' has 'end' member but no 'begin' member}}
131 }
132 for (auto u : NoEnd()) { // expected-error {{range type 'NoEnd' has 'begin' member but no 'end' member}}
133 }
134
135 struct NoIncr {
136 void *begin(); // expected-note {{selected 'begin' function with iterator type 'void *'}}
137 void *end();
138 };
139 for (auto u : NoIncr()) { // expected-error {{arithmetic on a pointer to void}}\
140 expected-note {{in implicit call to 'operator++' for iterator of type 'NoIncr'}}
141 }
142
143 struct NoNotEq {
144 NoNotEq begin(); // expected-note {{selected 'begin' function with iterator type 'NoNotEq'}}
145 NoNotEq end();
146 void operator++();
147 };
148 for (auto u : NoNotEq()) { // expected-error {{invalid operands to binary expression}}\
149 expected-note {{in implicit call to 'operator!=' for iterator of type 'NoNotEq'}}
150 }
151
152 struct NoDeref {
153 NoDeref begin(); // expected-note {{selected 'begin' function}}
154 NoDeref end();
155 void operator++();
156 bool operator!=(NoDeref &);
157 };
158
159 for (auto u : NoDeref()) { // expected-error {{indirection requires pointer operand}} \
160 expected-note {{in implicit call to 'operator*' for iterator of type 'NoDeref'}}
161 }
162
163 struct NoCopy {
164 NoCopy();
165 NoCopy(const NoCopy &) = delete;
166 int *begin();
167 int *end();
168 };
169 for (int n : NoCopy()) { // ok
170 }
171
172 for (int n : 42) { // expected-error {{invalid range expression of type 'int'; no viable 'begin' function available}}
173 }
174
175 for (auto a : *also_incomplete) { // expected-error {{cannot use incomplete type 'struct Incomplete' as a range}}
176 }
177 }
178
179 template<typename T, typename U>
h(T t)180 void h(T t) {
181 for (U u : t) { // expected-error {{no viable conversion from 'A' to 'int'}}
182 }
183 for (auto u : t) {
184 }
185 }
186
187 template void h<A, int>(A);
188 template void h<A(&)[4], A &>(A(&)[4]);
189 template void h<A(&)[13], A>(A(&)[13]);
190 template void h<A(&)[13], int>(A(&)[13]); // expected-note {{requested here}}
191
192 template<typename T>
i(T t)193 void i(T t) {
194 for (auto u : t) { // expected-error {{invalid range expression of type 'A *'; no viable 'begin' function available}} \
195 expected-error {{member function 'begin' not viable}} \
196 expected-note {{when looking up 'begin' function}}
197
198 }
199 }
200 template void i<A[13]>(A*); // expected-note {{requested here}}
201 template void i<const A>(const A); // expected-note {{requested here}}
202
203 namespace NS {
204 class ADL {};
205 int *begin(ADL); // expected-note {{no known conversion from 'NS::NoADL' to 'NS::ADL'}}
206 int *end(ADL);
207
208 class NoADL {};
209 }
210 int *begin(NS::NoADL);
211 int *end(NS::NoADL);
212
213 struct VoidBeginADL {};
214 void begin(VoidBeginADL); // expected-note {{selected 'begin' function with iterator type 'void'}}
215 void end(VoidBeginADL);
216
j()217 void j() {
218 for (auto u : NS::ADL()) {
219 }
220 for (auto u : NS::NoADL()) { // expected-error {{invalid range expression of type 'NS::NoADL'; no viable 'begin' function available}}
221 }
222 for (auto a : VoidBeginADL()) { // expected-error {{cannot use type 'void' as an iterator}}
223
224 }
225 }
226
example()227 void example() {
228 int array[5] = { 1, 2, 3, 4, 5 };
229 for (int &x : array)
230 x *= 2;
231 }
232