| 1 | // RUN: %clang_cc1 -fsyntax-only -verify %s |
| 2 | // expected-no-diagnostics |
| 3 | |
| 4 | // This test creates cases where implicit instantiations of various entities |
| 5 | // would cause a diagnostic, but provides expliict specializations for those |
| 6 | // entities that avoid the diagnostic. The intent is to verify that |
| 7 | // implicit instantiations do not occur (because the explicit specialization |
| 8 | // is used instead). |
| 9 | struct NonDefaultConstructible { |
| 10 | NonDefaultConstructible(int); |
| 11 | }; |
| 12 | |
| 13 | |
| 14 | // C++ [temp.expl.spec]p1: |
| 15 | // An explicit specialization of any of the following: |
| 16 | |
| 17 | // -- function template |
| 18 | template<typename T> void f0(T) { |
| 19 | T t; |
| 20 | } |
| 21 | |
| 22 | template<> void f0(NonDefaultConstructible) { } |
| 23 | |
| 24 | void test_f0(NonDefaultConstructible NDC) { |
| 25 | f0(NDC); |
| 26 | } |
| 27 | |
| 28 | // -- class template |
| 29 | template<typename T> |
| 30 | struct X0 { |
| 31 | static T member; |
| 32 | |
| 33 | void f1(T t) { |
| 34 | t = 17; |
| 35 | } |
| 36 | |
| 37 | struct Inner : public T { }; |
| 38 | |
| 39 | template<typename U> |
| 40 | struct InnerTemplate : public T { }; |
| 41 | |
| 42 | template<typename U> |
| 43 | void ft1(T t, U u); |
| 44 | }; |
| 45 | |
| 46 | template<typename T> |
| 47 | template<typename U> |
| 48 | void X0<T>::ft1(T t, U u) { |
| 49 | t = u; |
| 50 | } |
| 51 | |
| 52 | template<typename T> T X0<T>::member; |
| 53 | |
| 54 | template<> struct X0<void> { }; |
| 55 | X0<void> test_X0; |
| 56 | |
| 57 | |
| 58 | // -- member function of a class template |
| 59 | template<> void X0<void*>::f1(void *) { } |
| 60 | |
| 61 | void test_spec(X0<void*> xvp, void *vp) { |
| 62 | xvp.f1(vp); |
| 63 | } |
| 64 | |
| 65 | // -- static data member of a class template |
| 66 | template<> |
| 67 | NonDefaultConstructible X0<NonDefaultConstructible>::member = 17; |
| 68 | |
| 69 | NonDefaultConstructible &get_static_member() { |
| 70 | return X0<NonDefaultConstructible>::member; |
| 71 | } |
| 72 | |
| 73 | // -- member class of a class template |
| 74 | template<> |
| 75 | struct X0<void*>::Inner { }; |
| 76 | |
| 77 | X0<void*>::Inner inner0; |
| 78 | |
| 79 | // -- member class template of a class template |
| 80 | template<> |
| 81 | template<> |
| 82 | struct X0<void*>::InnerTemplate<int> { }; |
| 83 | |
| 84 | X0<void*>::InnerTemplate<int> inner_template0; |
| 85 | |
| 86 | // -- member function template of a class template |
| 87 | template<> |
| 88 | template<> |
| 89 | void X0<void*>::ft1(void*, const void*) { } |
| 90 | |
| 91 | void test_func_template(X0<void *> xvp, void *vp, const void *cvp) { |
| 92 | xvp.ft1(vp, cvp); |
| 93 | } |
| 94 | |
| 95 | // example from the standard: |
| 96 | template<class T> class stream; |
| 97 | template<> class stream<char> { /* ... */ }; |
| 98 | template<class T> class Array { /* ... */ }; |
| 99 | template<class T> void sort(Array<T>& v) { /* ... */ } |
| 100 | template<> void sort<char*>(Array<char*>&) ; |
| 101 | |