clang/test/SemaTemplate/explicit-instantiation.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify -fexceptions -fcxx-exceptions %s
   2 // RUN: %clang_cc1 -fsyntax-only -verify -fexceptions -fcxx-exceptions -std=c++11 %s
   3
   4 template void *; // expected-error{{expected unqualified-id}}
   5
   6 template typedef void f0; // expected-error{{explicit instantiation of typedef}}
   7
   8 int v0; // expected-note{{refers here}}
   9 template int v0; // expected-error{{does not refer}}
  10
  11 template<typename T>
  12 struct X0 {
  13   static T value;
  14
  15   T f0(T x) {
  16     return x + 1;  // expected-error{{invalid operands}}
  17   }
  18   T *f0(T *, T *) { return T(); } // expected-warning 0-1 {{expression which evaluates to zero treated as a null pointer constant of type 'int *'}} expected-error 0-1 {{cannot initialize return object of type 'int *' with an rvalue of type 'int'}}
  19
  20   template <typename U> T f0(T, U) { return T(); } // expected-note-re {{candidate template ignored: could not match 'int (int, U){{( __attribute__\(\(thiscall\)\))?}}' against 'int (int){{( __attribute__\(\(thiscall\)\))?}} const'}} \
  21                                                    // expected-note {{candidate template ignored: could not match 'int' against 'int *'}}
  22 };
  23
  24 template<typename T>
  25 T X0<T>::value; // expected-error{{no matching constructor}}
  26
  27 template int X0<int>::value;
  28
  29 struct NotDefaultConstructible { // expected-note{{candidate constructor (the implicit copy constructor)}} expected-note 0-1 {{candidate constructor (the implicit move constructor)}}
  30   NotDefaultConstructible(int); // expected-note{{candidate constructor}}
  31 };
  32
  33 template NotDefaultConstructible X0<NotDefaultConstructible>::value; // expected-note{{instantiation}}
  34
  35 template int X0<int>::f0(int);
  36 template int* X0<int>::f0(int*, int*); // expected-note{{in instantiation of member function 'X0<int>::f0' requested here}}
  37 template int X0<int>::f0(int, float);
  38
  39 template int X0<int>::f0(int) const; // expected-error{{does not refer}}
  40 template int* X0<int>::f0(int*, float*); // expected-error{{does not refer}}
  41
  42 struct X1 { };
  43 typedef int X1::*MemPtr;
  44
  45 template MemPtr X0<MemPtr>::f0(MemPtr); // expected-note{{requested here}}
  46
  47 struct X2 {
  48   int f0(int); // expected-note{{refers here}}
  49
  50   template<typename T> T f1(T) { return T(); }
  51   template<typename T> T* f1(T*) { return 0; }
  52
  53   template<typename T, typename U> void f2(T, U*) { } // expected-note{{candidate}}
  54   template<typename T, typename U> void f2(T*, U) { } // expected-note{{candidate}}
  55 };
  56
  57 template int X2::f0(int); // expected-error{{not an instantiation}}
  58
  59 template int *X2::f1(int *); // okay
  60
  61 template void X2::f2(int *, int *); // expected-error{{ambiguous}}
  62
  63 template <typename T>
  64 void print_type() {} // expected-note {{candidate template ignored: could not match 'void ()' against 'void (float *)'}}
  65
  66 template void print_type<int>();
  67 template void print_type<float>();
  68
  69 template <typename T>
  70 void print_type(T *) {} // expected-note {{candidate template ignored: could not match 'void (int *)' against 'void (float *)'}}
  71
  72 template void print_type(int*);
  73 template void print_type<int>(float*); // expected-error{{does not refer}}
  74
  75 void print_type(double*);
  76 template void print_type<double>(double*);
  77
  78 // PR5069
  79 template<int I> void foo0 (int (&)[I + 1]) { }
  80 template void foo0<2> (int (&)[3]);
  81
  82 namespace explicit_instantiation_after_implicit_instantiation {
  83   template <int I> struct X0 { static int x; };
  84   template <int I> int X0<I>::x;
  85   void test1() { (void)&X0<1>::x; }
  86   template struct X0<1>;
  87 }
  88
  89 template<typename> struct X3 { };
  90 inline template struct X3<int>; // expected-warning{{ignoring 'inline' keyword on explicit template instantiation}}
  91 static template struct X3<float>; // expected-warning{{ignoring 'static' keyword on explicit template instantiation}}
  92
  93 namespace PR7622 {
  94   template<typename,typename=int>
  95   struct basic_streambuf;
  96
  97   template<typename,typename>
  98   struct basic_streambuf{friend bob<>()}; // expected-error{{no template named 'bob'}} \
  99                                           // expected-error{{expected member name or ';' after declaration specifiers}}
 100   template struct basic_streambuf<int>;
 101 }
 102
 103 // Test that we do not crash.
 104 class TC1 {
 105   class TC2 {
 106     template
 107     void foo() { } // expected-error{{expected '<' after 'template'}}
 108    };
 109 };
 110
 111 namespace PR8020 {
 112   template <typename T> struct X { X() {} };
 113   template<> struct X<int> { X(); };
 114   template X<int>::X() {}  // expected-error{{function cannot be defined in an explicit instantiation}}
 115 }
 116
 117 namespace PR10086 {
 118   template void foobar(int i) {}  // expected-error{{function cannot be defined in an explicit instantiation}}
 119   int func() {
 120     foobar(5);
 121   }
 122 }
 123
 124 namespace undefined_static_data_member {
 125   template<typename T> struct A {
 126     static int a; // expected-note {{here}}
 127     template<typename U> static int b; // expected-note {{here}} expected-warning 0+ {{extension}}
 128   };
 129   struct B {
 130     template<typename U> static int c; // expected-note {{here}} expected-warning 0+ {{extension}}
 131   };
 132
 133   template int A<int>::a; // expected-error {{explicit instantiation of undefined static data member 'a' of class template 'undefined_static_data_member::A<int>'}}
 134   template int A<int>::b<int>; // expected-error {{explicit instantiation of undefined variable template 'undefined_static_data_member::A<int>::b<int>'}}
 135   template int B::c<int>; // expected-error {{explicit instantiation of undefined variable template 'undefined_static_data_member::B::c<int>'}}
 136
 137
 138   template<typename T> struct C {
 139     static int a;
 140     template<typename U> static int b; // expected-warning 0+ {{extension}}
 141   };
 142   struct D {
 143     template<typename U> static int c; // expected-warning 0+ {{extension}}
 144   };
 145   template<typename T> int C<T>::a;
 146   template<typename T> template<typename U> int C<T>::b; // expected-warning 0+ {{extension}}
 147   template<typename U> int D::c; // expected-warning 0+ {{extension}}
 148
 149   template int C<int>::a;
 150   template int C<int>::b<int>;
 151   template int D::c<int>;
 152 }
 153
 154 // expected-note@+1 3-4 {{explicit instantiation refers here}}
 155 template <class T> void Foo(T i) throw(T) { throw i; }
 156 // expected-error@+1 {{exception specification in explicit instantiation does not match instantiated one}}
 157 template void Foo(int a) throw(char);
 158 // expected-error@+1 {{exception specification in explicit instantiation does not match instantiated one}}
 159 template void Foo(double a) throw();
 160 // expected-error@+1 1 {{exception specification in explicit instantiation does not match instantiated one}}
 161 template void Foo(long a) throw(long, char);
 162 template void Foo(float a);
 163 #if __cplusplus >= 201103L
 164 // expected-error@+1 0-1 {{exception specification in explicit instantiation does not match instantiated one}}
 165 template void Foo(double a) noexcept;
 166 #endif
 167
 168 #if __cplusplus >= 201103L
 169 namespace PR21942 {
 170 template <int>
 171 struct A {
 172   virtual void foo() final;
 173 };
 174
 175 template <>
 176 void A<0>::foo() {} // expected-note{{overridden virtual function is here}}
 177
 178 struct B : A<0> {
 179   virtual void foo() override; // expected-error{{declaration of 'foo' overrides a 'final' function}}
 180 };
 181 }
 182 #endif