82 lines · cpp
1// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s2 3// If a template-parameter of a class template or alias template has a default4// template-argument, each subsequent template-parameter shall either have a5// default template-argument supplied or be a template parameter pack.6template<typename> struct vector;7 8template<typename T = int, typename> struct X3t; // expected-error{{template parameter missing a default argument}} expected-note{{previous default template argument defined here}}9template<typename T = int, typename> using A3t = int; // expected-error{{template parameter missing a default argument}} expected-note{{previous default template argument defined here}}10template<int V = 0, int> struct X3nt; // expected-error{{template parameter missing a default argument}} expected-note{{previous default template argument defined here}}11template<int V = 0, int> using A3nt = int; // expected-error{{template parameter missing a default argument}} expected-note{{previous default template argument defined here}}12template<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}}13template<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 15template<typename T = int, typename ...Types> struct X2t;16template<typename T = int, typename ...Types> using A2t = X2t<T, Types...>;17template<int V = 0, int ...Values> struct X2nt;18template<int V = 0, int ...Values> using A2nt = X2nt<V, Values...>;19template<template<class> class M = vector, template<class> class... Metas>20 struct X2tt;21template<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 a25// template parameter pack, it shall be the last template-parameter.26template<typename ...Types, // expected-error{{template parameter pack must be the last template parameter}}27 int After, int After2>28struct X0t;29X0t<int> pr9789();30template<typename ...Types, // expected-error{{template parameter pack must be the last template parameter}}31 int After>32using A0t = int;33 34template<int ...Values, // expected-error{{template parameter pack must be the last template parameter}}35 int After>36struct X0nt;37template<int ...Values, // expected-error{{template parameter pack must be the last template parameter}}38 int After>39using A0nt = int;40 41template<template<typename> class ...Templates, // expected-error{{template parameter pack must be the last template parameter}}42 int After>43struct X0tt;44template<template<typename> class ...Templates, // expected-error{{template parameter pack must be the last template parameter}}45 int After>46using A0tt = int;47 48// [ Note: These are not requirements for function templates or class49// template partial specializations because template arguments can be50// deduced (14.8.2). -- end note]51template<typename... Types> struct X1t;52template<typename ...Types, typename T> struct X1t<T, Types...> { };53 54template<int... Values> struct X1nt;55template<int ...Values, int V> struct X1nt<V, Values...> { };56 57template<template<int> class... Meta> struct X1tt;58template<template<int> class... Meta, template<int> class M> 59 struct X1tt<M, Meta...> { };60 61template<typename ...Types, typename T>62void f1t(X1t<T, Types...>);63 64template<int ...Values, int V>65void f1nt(X1nt<V, Values...>);66 67template<template<int> class... Meta, template<int> class M> 68void f1tt(X1tt<M, Meta...>);69 70namespace DefaultTemplateArgsInFunction {71 template<typename T = int, typename U> T &f0(U) { T *x = 0; return *x; }72 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