clang/test/CXX/temp/temp.param/p9-0x.cpp

   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 }