1 // RUN: %clang_cc1 -fsyntax-only -std=c++98 -Wconversion -verify %s
2 template<int N> struct A; // expected-note 5{{template parameter is declared here}}
3 
4 A<0> *a0;
5 
6 A<int()> *a1; // expected-error{{template argument for non-type template parameter is treated as function type 'int ()'}}
7 
8 A<int> *a2; // expected-error{{template argument for non-type template parameter must be an expression}}
9 
10 A<1 >> 2> *a3; // expected-warning{{use of right-shift operator ('>>') in template argument will require parentheses in C++11}}
11 
12 // C++ [temp.arg.nontype]p5:
13 A<A> *a4; // expected-error{{must be an expression}}
14 
15 enum E { Enumerator = 17 };
16 A<E> *a5; // expected-error{{template argument for non-type template parameter must be an expression}}
17 template<E Value> struct A1; // expected-note{{template parameter is declared here}}
18 A1<Enumerator> *a6; // okay
19 A1<17> *a7; // expected-error{{non-type template argument of type 'int' cannot be converted to a value of type 'E'}}
20 
21 const long LongValue = 12345678;
22 A<LongValue> *a8;
23 const short ShortValue = 17;
24 A<ShortValue> *a9;
25 
26 int f(int);
27 A<f(17)> *a10; // expected-error{{non-type template argument of type 'int' is not an integral constant expression}}
28 
29 class X {
30 public:
31   X();
32   X(int, int);
33   operator int() const;
34 };
35 A<X(17, 42)> *a11; // expected-error{{non-type template argument of type 'X' must have an integral or enumeration type}}
36 
37 float f(float);
38 
39 float g(float); // expected-note 2{{candidate function}}
40 double g(double); // expected-note 2{{candidate function}}
41 
42 int h(int);
43 float h2(float);
44 
45 template<int fp(int)> struct A3; // expected-note 1{{template parameter is declared here}}
46 A3<h> *a14_1;
47 A3<&h> *a14_2;
48 A3<f> *a14_3;
49 A3<&f> *a14_4;
50 A3<h2> *a14_6;  // expected-error{{non-type template argument of type 'float (float)' cannot be converted to a value of type 'int (*)(int)'}}
51 A3<g> *a14_7; // expected-error{{address of overloaded function 'g' does not match required type 'int (int)'}}
52 
53 
54 struct Y { } y;
55 
56 volatile X * X_volatile_ptr;
57 template<X const &AnX> struct A4; // expected-note 2{{template parameter is declared here}}
58 X an_X;
59 A4<an_X> *a15_1; // okay
60 A4<*X_volatile_ptr> *a15_2; // expected-error{{non-type template argument does not refer to any declaration}}
61 A4<y> *15_3; //  expected-error{{non-type template parameter of reference type 'const X &' cannot bind to template argument of type 'struct Y'}} \
62             // FIXME: expected-error{{expected unqualified-id}}
63 
64 template<int (&fr)(int)> struct A5; // expected-note{{template parameter is declared here}}
65 A5<h> *a16_1;
66 A5<f> *a16_3;
67 A5<h2> *a16_6;  // expected-error{{non-type template parameter of reference type 'int (&)(int)' cannot bind to template argument of type 'float (float)'}}
68 A5<g> *a14_7; // expected-error{{address of overloaded function 'g' does not match required type 'int (int)'}}
69 
70 struct Z {
71   int foo(int);
72   float bar(float);
73   int bar(int);
74   double baz(double);
75 
76   int int_member;
77   float float_member;
78   union {
79     int union_member;
80   };
81 };
82 template<int (Z::*pmf)(int)> struct A6; // expected-note{{template parameter is declared here}}
83 A6<&Z::foo> *a17_1;
84 A6<&Z::bar> *a17_2;
85 A6<&Z::baz> *a17_3; // expected-error{{non-type template argument of type 'double (Z::*)(double)' cannot be converted to a value of type 'int (Z::*)(int)'}}
86 
87 
88 template<int Z::*pm> struct A7;  // expected-note{{template parameter is declared here}}
89 template<int Z::*pm> struct A7c;
90 A7<&Z::int_member> *a18_1;
91 A7c<&Z::int_member> *a18_2;
92 A7<&Z::float_member> *a18_3; // expected-error{{non-type template argument of type 'float Z::*' cannot be converted to a value of type 'int Z::*'}}
93 A7c<(&Z::int_member)> *a18_4; // expected-warning{{address non-type template argument cannot be surrounded by parentheses}}
94 A7c<&Z::union_member> *a18_5;
95 
96 template<unsigned char C> struct Overflow; // expected-note{{template parameter is declared here}}
97 
98 Overflow<5> *overflow1; // okay
99 Overflow<255> *overflow2; // okay
100 Overflow<256> *overflow3; // expected-warning{{non-type template argument value '256' truncated to '0' for template parameter of type 'unsigned char'}}
101 
102 
103 template<unsigned> struct Signedness; // expected-note{{template parameter is declared here}}
104 Signedness<10> *signedness1; // okay
105 Signedness<-10> *signedness2; // expected-warning{{non-type template argument with value '-10' converted to '4294967286' for unsigned template parameter of type 'unsigned int'}}
106 
107 template<signed char C> struct SignedOverflow; // expected-note 3 {{template parameter is declared here}}
108 SignedOverflow<1> *signedoverflow1;
109 SignedOverflow<-1> *signedoverflow2;
110 SignedOverflow<-128> *signedoverflow3;
111 SignedOverflow<-129> *signedoverflow4; // expected-warning{{non-type template argument value '-129' truncated to '127' for template parameter of type 'signed char'}}
112 SignedOverflow<127> *signedoverflow5;
113 SignedOverflow<128> *signedoverflow6; // expected-warning{{non-type template argument value '128' truncated to '-128' for template parameter of type 'signed char'}}
114 SignedOverflow<(unsigned char)128> *signedoverflow7; // expected-warning{{non-type template argument value '128' truncated to '-128' for template parameter of type 'signed char'}}
115 
116 // Check canonicalization of template arguments.
117 template<int (*)(int, int)> struct FuncPtr0;
118 int func0(int, int);
119 extern FuncPtr0<&func0> *fp0;
120 template<int (*)(int, int)> struct FuncPtr0;
121 extern FuncPtr0<&func0> *fp0;
122 int func0(int, int);
123 extern FuncPtr0<&func0> *fp0;
124 
125 // PR5350
126 namespace ns {
127   template <typename T>
128   struct Foo {
129     static const bool value = true;
130   };
131 
132   template <bool b>
133   struct Bar {};
134 
135   const bool value = false;
136 
137   Bar<bool(ns::Foo<int>::value)> x;
138 }
139 
140 // PR5349
141 namespace ns {
142   enum E { k };
143 
144   template <E e>
145   struct Baz  {};
146 
147   Baz<k> f1;  // This works.
148   Baz<E(0)> f2;  // This too.
149   Baz<static_cast<E>(0)> f3;  // And this.
150 
151   Baz<ns::E(0)> b1;  // This doesn't work.
152   Baz<static_cast<ns::E>(0)> b2;  // This neither.
153 }
154 
155 // PR5597
156 template<int (*)(float)> struct X0 { };
157 
158 struct X1 {
159     static int pfunc(float);
160 };
161 void test_X0_X1() {
162   X0<X1::pfunc> x01;
163 }
164 
165 // PR6249
166 namespace pr6249 {
167   template<typename T, T (*func)()> T f() {
168     return func();
169   }
170 
171   int h();
172   template int f<int, h>();
173 }
174 
175 namespace PR6723 {
176   template<unsigned char C> void f(int (&a)[C]); // expected-note {{candidate template ignored}} \
177   // expected-note{{substitution failure [with C = '\x00']}}
178   void g() {
179     int arr512[512];
180     f(arr512); // expected-error{{no matching function for call}}
181     f<512>(arr512); // expected-error{{no matching function for call}}
182   }
183 }
184 
185 // Check that we instantiate declarations whose addresses are taken
186 // for non-type template arguments.
187 namespace EntityReferenced {
188   template<typename T, void (*)(T)> struct X { };
189 
190   template<typename T>
191   struct Y {
192     static void f(T x) {
193       x = 1; // expected-error{{assigning to 'int *' from incompatible type 'int'}}
194     }
195   };
196 
197   void g() {
198     typedef X<int*, Y<int*>::f> x; // expected-note{{in instantiation of}}
199   }
200 }
201 
202 namespace PR6964 {
203   template <typename ,int, int = 9223372036854775807L > // expected-warning 2{{non-type template argument value '9223372036854775807' truncated to '-1' for template parameter of type 'int'}} \
204   // expected-note 2{{template parameter is declared here}}
205   struct as_nview { };
206 
207   template <typename Sequence, int I0>
208   struct as_nview<Sequence, I0>  // expected-note{{while checking a default template argument used here}}
209   { };
210 }
211 
212 // rdar://problem/8302138
213 namespace test8 {
214   template <int* ip> struct A {
215     int* p;
216     A() : p(ip) {}
217   };
218 
219   void test0() {
220     extern int i00;
221     A<&i00> a00;
222   }
223 
224   extern int i01;
225   void test1() {
226     A<&i01> a01;
227   }
228 
229 
230   struct C {
231     int x;
232     char y;
233     double z;
234   };
235 
236   template <C* cp> struct B {
237     C* p;
238     B() : p(cp) {}
239   };
240 
241   void test2() {
242     extern C c02;
243     B<&c02> b02;
244   }
245 
246   extern C c03;
247   void test3() {
248     B<&c03> b03;
249   }
250 }
251 
252 namespace PR8372 {
253   template <int I> void foo() { } // expected-note{{template parameter is declared here}}
254   void bar() { foo <0x80000000> (); } // expected-warning{{non-type template argument value '2147483648' truncated to '-2147483648' for template parameter of type 'int'}}
255 }
256 
257 namespace PR9227 {
258   template <bool B> struct enable_if_bool { };
259   template <> struct enable_if_bool<true> { typedef int type; }; // expected-note{{'enable_if_bool<true>::type' declared here}}
260   void test_bool() { enable_if_bool<false>::type i; } // expected-error{{enable_if_bool<false>'; did you mean 'enable_if_bool<true>::type'?}}
261 
262   template <char C> struct enable_if_char { };
263   template <> struct enable_if_char<'a'> { typedef int type; }; // expected-note 5{{'enable_if_char<'a'>::type' declared here}}
264   void test_char_0() { enable_if_char<0>::type i; } // expected-error{{enable_if_char<'\x00'>'; did you mean 'enable_if_char<'a'>::type'?}}
265   void test_char_b() { enable_if_char<'b'>::type i; } // expected-error{{enable_if_char<'b'>'; did you mean 'enable_if_char<'a'>::type'?}}
266   void test_char_possibly_negative() { enable_if_char<'\x02'>::type i; } // expected-error{{enable_if_char<'\x02'>'; did you mean 'enable_if_char<'a'>::type'?}}
267   void test_char_single_quote() { enable_if_char<'\''>::type i; } // expected-error{{enable_if_char<'\''>'; did you mean 'enable_if_char<'a'>::type'?}}
268   void test_char_backslash() { enable_if_char<'\\'>::type i; } // expected-error{{enable_if_char<'\\'>'; did you mean 'enable_if_char<'a'>::type'?}}
269 }
270 
271 namespace PR10579 {
272   namespace fcppt
273   {
274     namespace container
275     {
276       namespace bitfield
277       {
278 
279         template<
280           typename Enum,
281           Enum Size
282           >
283         class basic;
284 
285         template<
286           typename Enum,
287           Enum Size
288           >
289         class basic
290         {
291         public:
292           basic()
293           {
294           }
295         };
296 
297       }
298     }
299   }
300 
301   namespace
302   {
303 
304     namespace testenum
305     {
306       enum type
307         {
308           foo,
309           bar,
310           size
311         };
312     }
313 
314   }
315 
316   int main()
317   {
318     typedef fcppt::container::bitfield::basic<
319     testenum::type,
320       testenum::size
321       > bitfield_foo;
322 
323     bitfield_foo obj;
324   }
325 
326 }
327 
328 template <int& I> struct PR10766 { static int *ip; };
329 template <int& I> int* PR10766<I>::ip = &I;
330 
331 namespace rdar13000548 {
332   template<typename R, typename U, R F>
333   U f() { return &F; } // expected-error{{cannot take the address of an rvalue of type 'int (*)(int)'}} expected-error{{cannot take the address of an rvalue of type 'int *'}}
334 
335   int g(int);
336   int y[3];
337   void test()
338   {
339     f<int(int), int (*)(int), g>(); // expected-note{{in instantiation of}}
340     f<int[3], int*, y>(); // expected-note{{in instantiation of}}
341   }
342 
343 }
344 
345 namespace rdar13806270 {
346   template <unsigned N> class X { };
347   const unsigned value = 32;
348   struct Y {
349     X<value + 1> x;
350   };
351   void foo() {}
352 }
353 
354 namespace PR17696 {
355   struct a {
356     union {
357       int i;
358     };
359   };
360 
361   template <int (a::*p)> struct b : a {
362     b() { this->*p = 0; }
363   };
364 
365   b<&a::i> c; // okay
366 }
367