зеркало из https://github.com/microsoft/clang.git
40 строки
1.5 KiB
C++
40 строки
1.5 KiB
C++
// RUN: %clang_cc1 -std=c++11 -verify %s
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struct Base {
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static const int a = 1;
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};
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template<typename T> struct S : Base {
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enum E : int;
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constexpr int f() const;
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constexpr int g() const;
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void h();
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};
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template<> enum S<char>::E : int {}; // expected-note {{enum 'S<char>::E' was explicitly specialized here}}
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template<> enum S<short>::E : int { b = 2 };
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template<> enum S<int>::E : int { a = 4 };
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template<typename T> enum S<T>::E : int { b = 8 };
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// The unqualified-id here names a member of the non-dependent base class Base
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// and not the injected enumerator name 'a' from the specialization.
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template<typename T> constexpr int S<T>::f() const { return a; }
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static_assert(S<char>().f() == 1, "");
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static_assert(S<int>().f() == 1, "");
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// The unqualified-id here names a member of the current instantiation, which
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// bizarrely might not exist in some instantiations.
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template<typename T> constexpr int S<T>::g() const { return b; } // expected-error {{enumerator 'b' does not exist in instantiation of 'S<char>'}}
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static_assert(S<char>().g() == 1, ""); // expected-note {{here}} expected-error {{not an integral constant expression}}
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static_assert(S<short>().g() == 2, "");
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static_assert(S<long>().g() == 8, "");
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// 'b' is type-dependent, so these assertions should not fire before 'h' is
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// instantiated.
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template<typename T> void S<T>::h() {
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char c[S<T>::b];
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static_assert(b != 8, "");
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static_assert(sizeof(c) != 8, "");
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}
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void f() {
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S<short>().h(); // ok, b == 2
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}
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