default-expr-arguments.cpp revision be0f7bd61c7b2879d02ae75aad7a91d92f819d94 
1// RUN: %clang_cc1 -fsyntax-only -verify %s
2template<typename T>
3class C { C(int a0 = 0); };
4
5template<>
6C<char>::C(int a0);
7
8struct S { }; // expected-note 3 {{candidate constructor (the implicit copy constructor)}}
9
10template<typename T> void f1(T a, T b = 10) { } // expected-error{{no viable conversion}} \
11// expected-note{{passing argument to parameter 'b' here}}
12
13template<typename T> void f2(T a, T b = T()) { }
14
15template<typename T> void f3(T a, T b = T() + T()); // expected-error{{invalid operands to binary expression ('S' and 'S')}}
16
17void g() {
18  f1(10);
19  f1(S()); // expected-note{{in instantiation of default function argument expression for 'f1<S>' required here}}
20
21  f2(10);
22  f2(S());
23
24  f3(10);
25  f3(S()); // expected-note{{in instantiation of default function argument expression for 'f3<S>' required here}}
26}
27
28template<typename T> struct F {
29  F(T t = 10); // expected-error{{no viable conversion}} \
30  // expected-note{{passing argument to parameter 't' here}}
31  void f(T t = 10); // expected-error{{no viable conversion}} \
32  // expected-note{{passing argument to parameter 't' here}}
33};
34
35struct FD : F<int> { };
36
37void g2() {
38  F<int> f;
39  FD fd;
40}
41
42void g3(F<int> f, F<struct S> s) {
43  f.f();
44  s.f(); // expected-note{{in instantiation of default function argument expression for 'f<S>' required here}}
45
46  F<int> f2;
47  F<S> s2; // expected-note{{in instantiation of default function argument expression for 'F<S>' required here}}
48}
49
50template<typename T> struct G {
51  G(T) {}
52};
53
54void s(G<int> flags = 10) { }
55
56// Test default arguments
57template<typename T>
58struct X0 {
59  void f(T = T()); // expected-error{{no matching}}
60};
61
62template<typename U>
63void X0<U>::f(U) { }
64
65void test_x0(X0<int> xi) {
66  xi.f();
67  xi.f(17);
68}
69
70struct NotDefaultConstructible { // expected-note 2{{candidate}}
71  NotDefaultConstructible(int); // expected-note 2{{candidate}}
72};
73
74void test_x0_not_default_constructible(X0<NotDefaultConstructible> xn) {
75  xn.f(NotDefaultConstructible(17));
76  xn.f(42);
77  xn.f(); // expected-note{{in instantiation of default function argument}}
78}
79
80template<typename T>
81struct X1 {
82  typedef T value_type;
83  X1(const value_type& value = value_type());
84};
85
86void test_X1() {
87  X1<int> x1;
88}
89
90template<typename T>
91struct X2 {
92  void operator()(T = T()); // expected-error{{no matching}}
93};
94
95void test_x2(X2<int> x2i, X2<NotDefaultConstructible> x2n) {
96  x2i();
97  x2i(17);
98  x2n(NotDefaultConstructible(17));
99  x2n(); // expected-note{{in instantiation of default function argument}}
100}
101
102// PR5283
103namespace PR5283 {
104template<typename T> struct A {
105  A(T = 1); // expected-error 3 {{cannot initialize a parameter of type 'int *' with an rvalue of type 'int'}} \
106  // expected-note 3{{passing argument to parameter here}}
107};
108
109struct B : A<int*> {
110  B();
111};
112B::B() { } // expected-note {{in instantiation of default function argument expression for 'A<int *>' required he}}
113
114struct C : virtual A<int*> {
115  C();
116};
117C::C() { } // expected-note {{in instantiation of default function argument expression for 'A<int *>' required he}}
118
119struct D {
120  D();
121
122  A<int*> a;
123};
124D::D() { } // expected-note {{in instantiation of default function argument expression for 'A<int *>' required he}}
125}
126
127// PR5301
128namespace pr5301 {
129  void f(int, int = 0);
130
131  template <typename T>
132  void g(T, T = 0);
133
134  template <int I>
135  void i(int a = I);
136
137  template <typename T>
138  void h(T t) {
139    f(0);
140    g(1);
141    g(t);
142    i<2>();
143  }
144
145  void test() {
146    h(0);
147  }
148}
149
150// PR5810
151namespace PR5810 {
152  template<typename T>
153  struct allocator {
154    allocator() { int a[sizeof(T) ? -1 : -1]; } // expected-error2 {{array size is negative}}
155  };
156
157  template<typename T>
158  struct vector {
159    vector(const allocator<T>& = allocator<T>()) {} // expected-note2 {{instantiation of}}
160  };
161
162  struct A { };
163  struct B { };
164
165  template<typename>
166  void FilterVTs() {
167    vector<A> Result;
168  }
169
170  void f() {
171    vector<A> Result;
172  }
173
174  template<typename T>
175  struct X {
176    vector<B> bs;
177    X() { }
178  };
179
180  void f2() {
181    X<float> x; // expected-note{{member function}}
182  }
183}
184
185template<typename T> void f4(T, int = 17);
186template<> void f4<int>(int, int);
187
188void f4_test(int i) {
189  f4(i);
190}
191
192// Instantiate for initialization
193namespace InstForInit {
194  template<typename T>
195  struct Ptr {
196    typedef T* type;
197    Ptr(type);
198  };
199
200  template<typename T>
201  struct Holder {
202    Holder(int i, Ptr<T> ptr = 0);
203  };
204
205  void test_holder(int i) {
206    Holder<int> h(i);
207  }
208};
209
210namespace PR5810b {
211  template<typename T>
212  T broken() {
213    T t;
214    double**** not_it = t;
215  }
216
217  void f(int = broken<int>());
218  void g() { f(17); }
219}
220
221namespace PR8127 {
222  template< typename T > class PointerClass {
223  public:
224    PointerClass( T * object_p ) : p_( object_p ) {
225      p_->acquire();
226    }
227  private:
228    T * p_;
229  };
230
231  class ExternallyImplementedClass;
232
233  class MyClass {
234    void foo( PointerClass<ExternallyImplementedClass> = 0 );
235  };
236}
237