31 lines
852 B
C++
31 lines
852 B
C++
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// RUN: %clang_cc1 -std=c++11 -verify %s
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template<typename ...T> struct X {
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void f(int);
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void f(...);
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static int n;
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};
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template<typename T, typename U> using A = T;
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// These definitions are OK, X<A<T, decltype(...)>...> is equivalent to X<T...>
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// so this defines the member of the primary template.
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template<typename ...T>
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void X<A<T, decltype(f(T()))>...>::f(int) {} // expected-error {{undeclared}}
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template<typename ...T>
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int X<A<T, decltype(f(T()))>...>::n = 0; // expected-error {{undeclared}}
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struct Y {}; void f(Y);
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void g() {
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// OK, substitution succeeds.
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X<Y>().f(0);
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X<Y>::n = 1;
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// Error, substitution fails; this should not be treated as a SFINAE-able
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// condition, so we don't select X<void>::f(...).
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X<void>().f(0); // expected-note {{instantiation of}}
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X<void>::n = 1; // expected-note {{instantiation of}}
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}
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