| 1 | // RUN: %clang_cc1 -std=c++14 %s -verify -fms-extensions -triple x86_64-windows-msvc |
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| 2 | // RUN: %clang_cc1 -std=c++17 %s -verify -fms-extensions -triple x86_64-windows-msvc |
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| 3 | |
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| 4 | __declspec(dllimport) void imported_func(); |
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| 5 | __declspec(dllimport) int imported_int; |
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| 6 | struct Foo { |
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| 7 | void __declspec(dllimport) imported_method(); |
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| 8 | }; |
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| 9 | |
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| 10 | // Instantiation is OK. |
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| 11 | template <void (*FP)()> struct TemplateFnPtr { |
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| 12 | static void getit() { FP(); } |
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| 13 | }; |
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| 14 | template <void (&FP)()> struct TemplateFnRef { |
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| 15 | static void getit() { FP(); } |
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| 16 | }; |
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| 17 | void instantiate1() { |
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| 18 | TemplateFnPtr<&imported_func>::getit(); |
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| 19 | TemplateFnRef<imported_func>::getit(); |
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| 20 | } |
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| 21 | |
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| 22 | // Check variable template instantiation. |
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| 23 | template <int *GI> struct TemplateIntPtr { |
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| 24 | static int getit() { return *GI; } |
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| 25 | }; |
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| 26 | template <int &GI> struct TemplateIntRef { |
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| 27 | static int getit() { return GI; } |
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| 28 | }; |
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| 29 | int instantiate2() { |
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| 30 | int r = 0; |
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| 31 | r += TemplateIntPtr<&imported_int>::getit(); |
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| 32 | r += TemplateIntRef<imported_int>::getit(); |
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| 33 | return r; |
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| 34 | } |
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| 35 | |
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| 36 | // Member pointer instantiation. |
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| 37 | template <void (Foo::*MP)()> struct TemplateMemPtr { }; |
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| 38 | TemplateMemPtr<&Foo::imported_method> instantiate_mp; |
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| 39 | |
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| 40 | // constexpr initialization doesn't work for dllimport things. |
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| 41 | // expected-error@+1{{must be initialized by a constant expression}} |
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| 42 | constexpr void (*constexpr_import_func)() = &imported_func; |
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| 43 | // expected-error@+1{{must be initialized by a constant expression}} |
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| 44 | constexpr int *constexpr_import_int = &imported_int; |
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| 45 | // expected-error@+1{{must be initialized by a constant expression}} |
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| 46 | constexpr void (Foo::*constexpr_memptr)() = &Foo::imported_method; |
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| 47 | |
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| 48 | // We make dynamic initializers for 'const' globals, but not constexpr ones. |
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| 49 | void (*const const_import_func)() = &imported_func; |
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| 50 | int *const const_import_int = &imported_int; |
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| 51 | void (Foo::*const const_memptr)() = &Foo::imported_method; |
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| 52 | |
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| 53 | // Check that using a non-type template parameter for constexpr global |
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| 54 | // initialization is correctly diagnosed during template instantiation. |
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| 55 | template <void (*FP)()> struct StaticConstexpr { |
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| 56 | // expected-error@+1{{must be initialized by a constant expression}} |
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| 57 | static constexpr void (*g_fp)() = FP; |
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| 58 | }; |
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| 59 | void instantiate3() { |
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| 60 | // expected-note@+1 {{requested here}} |
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| 61 | StaticConstexpr<imported_func>::g_fp(); |
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| 62 | } |
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| 63 | |
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