| 1 | // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s |
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| 2 | |
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| 3 | // Fun things you can do with inline namespaces: |
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| 4 | |
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| 5 | inline namespace X { |
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| 6 | void f1(); // expected-note {{'f1' declared here}} |
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| 7 | |
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| 8 | inline namespace Y { |
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| 9 | void f2(); |
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| 10 | |
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| 11 | template <typename T> class C {}; |
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| 12 | } |
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| 13 | |
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| 14 | // Specialize and partially specialize somewhere else. |
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| 15 | template <> class C<int> {}; |
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| 16 | template <typename T> class C<T*> {}; |
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| 17 | } |
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| 18 | |
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| 19 | // Qualified and unqualified lookup as if member of enclosing NS. |
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| 20 | void foo1() { |
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| 21 | f1(); |
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| 22 | ::f1(); |
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| 23 | X::f1(); |
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| 24 | Y::f1(); // expected-error {{no member named 'f1' in namespace 'X::Y'; did you mean simply 'f1'?}} |
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| 25 | |
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| 26 | f2(); |
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| 27 | ::f2(); |
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| 28 | X::f2(); |
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| 29 | Y::f2(); |
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| 30 | } |
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| 31 | |
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| 32 | template <> class C<float> {}; |
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| 33 | template <typename T> class C<T&> {}; |
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| 34 | |
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| 35 | template class C<double>; |
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| 36 | |
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| 37 | |
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| 38 | // As well as all the fun with ADL. |
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| 39 | |
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| 40 | namespace ADL { |
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| 41 | struct Outer {}; |
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| 42 | |
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| 43 | inline namespace IL { |
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| 44 | struct Inner {}; |
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| 45 | |
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| 46 | void fo(Outer); |
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| 47 | } |
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| 48 | |
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| 49 | void fi(Inner); |
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| 50 | |
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| 51 | inline namespace IL2 { |
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| 52 | void fi2(Inner); |
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| 53 | } |
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| 54 | } |
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| 55 | |
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| 56 | void foo2() { |
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| 57 | ADL::Outer o; |
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| 58 | ADL::Inner i; |
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| 59 | fo(o); |
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| 60 | fi(i); |
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| 61 | fi2(i); |
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| 62 | } |
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| 63 | |
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| 64 | // Let's not forget overload sets. |
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| 65 | struct Distinct {}; |
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| 66 | inline namespace Over { |
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| 67 | void over(Distinct); |
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| 68 | } |
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| 69 | void over(int); |
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| 70 | |
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| 71 | void foo3() { |
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| 72 | Distinct d; |
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| 73 | ::over(d); |
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| 74 | } |
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| 75 | |
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| 76 | // Don't forget to do correct lookup for redeclarations. |
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| 77 | namespace redecl { inline namespace n1 { |
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| 78 | |
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| 79 | template <class Tp> class allocator; |
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| 80 | |
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| 81 | template <> |
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| 82 | class allocator<void> |
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| 83 | { |
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| 84 | public: |
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| 85 | typedef const void* const_pointer; |
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| 86 | }; |
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| 87 | |
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| 88 | template <class Tp> |
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| 89 | class allocator |
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| 90 | { |
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| 91 | public: |
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| 92 | typedef Tp& reference; |
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| 93 | |
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| 94 | void allocate(allocator<void>::const_pointer = 0); |
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| 95 | }; |
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| 96 | |
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| 97 | } } |
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| 98 | |
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| 99 | // Normal redeclarations (not for explicit instantiations or |
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| 100 | // specializations) are distinct in an inline namespace vs. not in an |
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| 101 | // inline namespace. |
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| 102 | namespace redecl2 { |
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| 103 | inline namespace n1 { |
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| 104 | void f(int) { } |
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| 105 | struct X1 { }; |
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| 106 | template<typename T> void f(T) { } |
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| 107 | template<typename T> struct X2 { }; |
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| 108 | int i = 71; |
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| 109 | enum E { e }; |
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| 110 | } |
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| 111 | |
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| 112 | void f(int) { } |
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| 113 | struct X1 { }; |
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| 114 | template<typename T> void f(T) { } |
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| 115 | template<typename T> struct X2 { }; |
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| 116 | int i = 71; |
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| 117 | enum E { e }; |
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| 118 | } |
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| 119 | |
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