49 lines · cpp
1// RUN: %clang_cc1 -verify -std=c++11 %s2 3// Unlike in C++98, C++11 allows unions to have static data members.4 5union U1 {6 static constexpr int k1 = 0;7 static const int k2 = k1;8 static int k3 = k2; // expected-error {{non-const static data member must be initialized out of line}}9 static constexpr double k4 = k2;10 static const double k5 = k4; // expected-error {{requires 'constexpr' specifier}} expected-note {{add 'constexpr'}}11 int n[k1 + 3];12};13 14constexpr int U1::k1;15constexpr int U1::k2;16int U1::k3;17 18const double U1::k4;19const double U1::k5;20 21template<typename T>22union U2 {23 static const int k1;24 static double k2;25 T t;26};27template<typename T> constexpr int U2<T>::k1 = sizeof(U2<T>);28template<typename T> double U2<T>::k2 = 5.3;29 30static_assert(U2<int>::k1 == sizeof(int), "");31static_assert(U2<char>::k1 == sizeof(char), "");32 33union U3 {34 static const int k;35 U3() : k(0) {} // expected-error {{does not name a non-static data member}}36};37 38struct S {39 union {40 static const int n; // expected-error {{static data member 'n' not allowed in anonymous union}}41 int a;42 int b;43 };44};45static union {46 static const int k; // expected-error {{static data member 'k' not allowed in anonymous union}}47 int n;48};49