1 // RUN: %clang_cc1 -verify -std=c++1y %s 2 3 namespace PR17846 { 4 template <typename T> constexpr T pi = T(3.14); 5 template <typename T> constexpr T tau = 2 * pi<T>; 6 constexpr double tau_double = tau<double>; 7 static_assert(tau_double == 6.28, ""); 8 } 9 10 namespace PR17848 { 11 template<typename T> constexpr T var = 12345; 12 template<typename T> constexpr T f() { return var<T>; } 13 constexpr int k = f<int>(); 14 static_assert(k == 12345, ""); 15 } 16 17 namespace NonDependent { 18 template<typename T> constexpr T a = 0; 19 template<typename T> constexpr T b = a<int>; 20 static_assert(b<int> == 0, ""); 21 } 22 23 namespace InstantiationDependent { 24 int f(int); 25 void f(char); 26 27 template<int> constexpr int a = 1; 28 template<typename T> constexpr T b = a<sizeof(sizeof(f(T())))>; // expected-error {{invalid application of 'sizeof' to an incomplete type 'void'}} 29 30 static_assert(b<int> == 1, ""); 31 static_assert(b<char> == 1, ""); // expected-note {{in instantiation of}} expected-error {{not an integral constant}} 32 33 template<typename T> void f() { 34 static_assert(a<sizeof(sizeof(f(T())))> == 0, ""); // expected-error {{static_assert failed}} 35 } 36 } 37 38 namespace PR24483 { 39 template<typename> struct A; 40 template<typename... T> A<T...> models; 41 template<> struct B models<>; // expected-error {{incomplete type 'struct B'}} expected-note {{forward declaration}} 42 } 43
