1 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s 2 3 // If a template-parameter of a class template or alias template has a default 4 // template-argument, each subsequent template-parameter shall either have a 5 // default template-argument supplied or be a template parameter pack. 6 template<typename> struct vector; 7 8 template<typename T = int, typename> struct X3t; // expected-error{{template parameter missing a default argument}} expected-note{{previous default template argument defined here}} 9 template<typename T = int, typename> using A3t = int; // expected-error{{template parameter missing a default argument}} expected-note{{previous default template argument defined here}} 10 template<int V = 0, int> struct X3nt; // expected-error{{template parameter missing a default argument}} expected-note{{previous default template argument defined here}} 11 template<int V = 0, int> using A3nt = int; // expected-error{{template parameter missing a default argument}} expected-note{{previous default template argument defined here}} 12 template<template<class> class M = vector, template<class> class> struct X3tt; // expected-error{{template parameter missing a default argument}} expected-note{{previous default template argument defined here}} 13 template<template<class> class M = vector, template<class> class> using A3tt = int; // expected-error{{template parameter missing a default argument}} expected-note{{previous default template argument defined here}} 14 15 template<typename T = int, typename ...Types> struct X2t; 16 template<typename T = int, typename ...Types> using A2t = X2t<T, Types...>; 17 template<int V = 0, int ...Values> struct X2nt; 18 template<int V = 0, int ...Values> using A2nt = X2nt<V, Values...>; 19 template<template<class> class M = vector, template<class> class... Metas> 20 struct X2tt; 21 template<template<class> class M = vector, template<class> class... Metas> 22 using A2tt = X2tt<M, Metas...>; 23 24 // If a template-parameter of a primary class template or alias template is a 25 // template parameter pack, it shall be the last template-parameter. 26 template<typename ...Types, // expected-error{{template parameter pack must be the last template parameter}} 27 int After, int After2> 28 struct X0t; 29 X0t<int> pr9789(); 30 template<typename ...Types, // expected-error{{template parameter pack must be the last template parameter}} 31 int After> 32 using A0t = int; 33 34 template<int ...Values, // expected-error{{template parameter pack must be the last template parameter}} 35 int After> 36 struct X0nt; 37 template<int ...Values, // expected-error{{template parameter pack must be the last template parameter}} 38 int After> 39 using A0nt = int; 40 41 template<template<typename> class ...Templates, // expected-error{{template parameter pack must be the last template parameter}} 42 int After> 43 struct X0tt; 44 template<template<typename> class ...Templates, // expected-error{{template parameter pack must be the last template parameter}} 45 int After> 46 using A0tt = int; 47 48 // [ Note: These are not requirements for function templates or class 49 // template partial specializations because template arguments can be 50 // deduced (14.8.2). -- end note] 51 template<typename... Types> struct X1t; 52 template<typename ...Types, typename T> struct X1t<T, Types...> { }; 53 54 template<int... Values> struct X1nt; 55 template<int ...Values, int V> struct X1nt<V, Values...> { }; 56 57 template<template<int> class... Meta> struct X1tt; 58 template<template<int> class... Meta, template<int> class M> 59 struct X1tt<M, Meta...> { }; 60 61 template<typename ...Types, typename T> 62 void f1t(X1t<T, Types...>); 63 64 template<int ...Values, int V> 65 void f1nt(X1nt<V, Values...>); 66 67 template<template<int> class... Meta, template<int> class M> 68 void f1tt(X1tt<M, Meta...>); 69 70 namespace DefaultTemplateArgsInFunction { f0(U)71 template<typename T = int, typename U> T &f0(U) { T *x = 0; return *x; } 72 test_f0()73 void test_f0() { 74 int &ir0 = f0(3.14159); 75 int &ir1 = f0<int>(3.14159); 76 float &fr0 = f0<float>(3.14159); 77 } 78 79 template<> int &f0(int*); 80 template int &f0(double&); 81 } 82