80 lines
3.4 KiB
C++
80 lines
3.4 KiB
C++
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// RUN: %clang_cc1 -std=c++20 -verify %s
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// Templates and partial and explicit specializations can't have C linkage.
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namespace extern_c_templates {
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template<typename T> struct A {
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static int a;
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struct b;
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void c();
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enum class d;
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template<typename U> static int e;
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template<typename U> struct f;
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template<typename U> void g();
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};
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template<typename T> int B;
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template<typename T> void C();
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extern "C" { // expected-note 1+{{begins here}}
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// templates
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template<typename T> struct A; // expected-error {{templates must have C++ linkage}}
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template<typename T> int B; // expected-error {{templates must have C++ linkage}}
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template<typename T> void C(); // expected-error {{templates must have C++ linkage}}
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// non-template members of a template
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// FIXME: Should these really be valid?
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template<typename T> int A<T>::a;
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template<typename T> struct A<T>::b {};
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template<typename T> void A<T>::c() {}
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template<typename T> enum class A<T>::d {};
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// templates
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template<typename T> template<typename U> int A<T>::e; // expected-error {{templates must have C++ linkage}}
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template<typename T> template<typename U> struct A<T>::f {}; // expected-error {{templates must have C++ linkage}}
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template<typename T> template<typename U> void A<T>::g() {} // expected-error {{templates must have C++ linkage}}
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// partial specializations
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template<typename T> struct A<int*>; // expected-error {{templates must have C++ linkage}}
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template<typename T> int B<int*>; // expected-error {{templates must have C++ linkage}}
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template<typename T> template<typename U> int A<T>::e<U*>; // expected-error {{templates must have C++ linkage}}
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template<typename T> template<typename U> struct A<T>::f<U*> {}; // expected-error {{templates must have C++ linkage}}
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// explicit specializations of templates
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template<> struct A<char> {}; // expected-error {{templates must have C++ linkage}}
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template<> int B<char>; // expected-error {{templates must have C++ linkage}}
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template<> void C<char>() {} // expected-error {{templates must have C++ linkage}}
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// explicit specializations of members of a template
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template<> int A<int>::a; // expected-error {{templates must have C++ linkage}}
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template<> struct A<int>::b {}; // expected-error {{templates must have C++ linkage}}
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template<> void A<int>::c() {} // expected-error {{templates must have C++ linkage}}
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template<> enum class A<int>::d {}; // expected-error {{templates must have C++ linkage}}
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// explicit specializations of member templates
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template<> template<typename U> int A<int>::e; // expected-error {{templates must have C++ linkage}}
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template<> template<typename U> struct A<int>::f {}; // expected-error {{templates must have C++ linkage}}
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template<> template<typename U> void A<int>::g() {} // expected-error {{templates must have C++ linkage}}
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}
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// Provide valid definitions for the explicit instantiations below.
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// FIXME: Our recovery from the invalid definitions above isn't very good.
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template<typename T> template<typename U> int A<T>::e;
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template<typename T> template<typename U> struct A<T>::f {};
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template<typename T> template<typename U> void A<T>::g() {}
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extern "C" {
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// explicit instantiations
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// FIXME: Should these really be valid?
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template struct A<double>;
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template int A<float>::a;
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template struct A<float>::b;
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template void A<float>::c();
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template int A<float>::e<float>;
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template struct A<float>::f<float>;
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template void A<float>::g<float>();
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}
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}
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