1 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
2 
3 // A default template-argument may be specified for any kind of
4 // template-parameter that is not a template parameter pack.
5 template<typename ...Types = int> // expected-error{{template parameter pack cannot have a default argument}}
6 struct X0;
7 
8 template<int ...Values = 0> // expected-error{{template parameter pack cannot have a default argument}}
9 struct X1;
10 
11 template<typename T> struct vector;
12 
13 template<template<class> class ...Templates = vector> // expected-error{{template parameter pack cannot have a default argument}}
14 struct X2;
15 
16 struct X3 {
17   template<typename T = int> // expected-error{{default template argument not permitted on a friend template}}
18   friend void f0(X3);
19 
20   template<typename T = int>
21   friend void f1(X3) {
22   }
23 };
24 
25 namespace PR8748 {
26   // Testcase 1
27   struct A0 { template<typename U> struct B; };
28   template<typename U = int> struct A0::B { };
29 
30   // Testcase 2
31   template<typename T> struct A1 { template<typename U> struct B; };
32   template<typename T> template<typename U = int> struct A1<T>::B { }; // expected-error{{cannot add a default template argument to the definition of a member of a class template}}
33 
34   // Testcase 3
35   template<typename T>
36   struct X2 {
37     void f0();
38     template<typename U> void f1();
39   };
40 
41   template<typename T = int> void X2<T>::f0() { } // expected-error{{cannot add a default template argument to the definition of a member of a class template}}
42   template<typename T> template<typename U = int> void X2<T>::f1() { } // expected-error{{cannot add a default template argument to the definition of a member of a class template}}
43 
44   namespace Inner {
45     template<typename T> struct X3;
46     template<typename T> void f2();
47   }
48 
49   // Okay; not class members.
50   template<typename T = int> struct Inner::X3 { };
51   template<typename T = int> void Inner::f2() {}
52 }
53 
54 namespace PR10069 {
55   template<typename T, T a, T b=0, T c=1>
56   T f(T x);
57 
58   void g() {
59     f<unsigned int, 0>(0);
60   }
61 }
62