1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
| // RUN: %clang_cc1 -fsyntax-only -verify -std=c++1z -frelaxed-template-template-args %s
// expected-note@temp_arg_template_cxx1z.cpp:* 1+{{}}
template<template<int> typename> struct Ti;
template<template<int...> typename> struct TPi;
template<template<int, int...> typename> struct TiPi;
template<template<int..., int...> typename> struct TPiPi; // FIXME: Why is this not ill-formed?
template<typename T, template<T> typename> struct tT0;
template<template<typename T, T> typename> struct Tt0;
template<template<typename> typename> struct Tt;
template<template<typename, typename...> typename> struct TtPt;
template<int> struct i;
template<int, int = 0> struct iDi;
template<int, int> struct ii;
template<int...> struct Pi;
template<int, int, int...> struct iiPi;
template<int, typename = int> struct iDt;
template<int, typename> struct it;
template<typename T, T v> struct t0;
template<typename...> struct Pt;
namespace IntParam {
using ok = Pt<Ti<i>,
Ti<iDi>,
Ti<Pi>,
Ti<iDt>>;
using err1 = Ti<ii>; // expected-error {{different template parameters}}
using err2 = Ti<iiPi>; // expected-error {{different template parameters}}
using err3 = Ti<t0>; // expected-error {{different template parameters}}
using err4 = Ti<it>; // expected-error {{different template parameters}}
}
// These are accepted by the backwards-compatibility "parameter pack in
// parameter matches any number of parameters in arguments" rule.
namespace IntPackParam {
using ok = TPi<Pi>;
using ok_compat = Pt<TPi<i>, TPi<iDi>, TPi<ii>, TPi<iiPi>>;
using err1 = TPi<t0>; // expected-error {{different template parameters}}
using err2 = TPi<iDt>; // expected-error {{different template parameters}}
using err3 = TPi<it>; // expected-error {{different template parameters}}
}
namespace IntAndPackParam {
using ok = TiPi<Pi>;
using ok_compat = Pt<TiPi<ii>, TiPi<iDi>, TiPi<iiPi>>;
using err = TiPi<iDi>;
}
namespace DependentType {
using ok = Pt<tT0<int, i>, tT0<int, iDi>>;
using err1 = tT0<int, ii>; // expected-error {{different template parameters}}
using err2 = tT0<short, i>; // FIXME: should this be OK?
using err2a = tT0<long long, i>; // FIXME: should this be OK (if long long is larger than int)?
using err2b = tT0<void*, i>; // expected-error {{different template parameters}}
using err3 = tT0<short, t0>; // expected-error {{different template parameters}}
using ok2 = Tt0<t0>;
using err4 = Tt0<it>; // expected-error {{different template parameters}}
}
namespace Auto {
template<template<int> typename T> struct TInt {};
template<template<int*> typename T> struct TIntPtr {};
template<template<auto> typename T> struct TAuto {};
template<template<auto*> typename T> struct TAutoPtr {};
template<template<decltype(auto)> typename T> struct TDecltypeAuto {};
template<auto> struct Auto;
template<auto*> struct AutoPtr;
template<decltype(auto)> struct DecltypeAuto;
template<int> struct Int;
template<int*> struct IntPtr;
TInt<Auto> ia;
TInt<AutoPtr> iap; // FIXME: ill-formed (?)
TInt<DecltypeAuto> ida;
TInt<Int> ii;
TInt<IntPtr> iip; // expected-error {{different template parameters}}
TIntPtr<Auto> ipa;
TIntPtr<AutoPtr> ipap;
TIntPtr<DecltypeAuto> ipda;
TIntPtr<Int> ipi; // expected-error {{different template parameters}}
TIntPtr<IntPtr> ipip;
TAuto<Auto> aa;
TAuto<AutoPtr> aap; // FIXME: ill-formed (?)
TAuto<Int> ai; // FIXME: ill-formed (?)
TAuto<IntPtr> aip; // FIXME: ill-formed (?)
TAutoPtr<Auto> apa;
TAutoPtr<AutoPtr> apap;
TAutoPtr<Int> api; // FIXME: ill-formed (?)
TAutoPtr<IntPtr> apip; // FIXME: ill-formed (?)
TDecltypeAuto<DecltypeAuto> dada;
TDecltypeAuto<Int> dai; // FIXME: ill-formed (?)
TDecltypeAuto<IntPtr> daip; // FIXME: ill-formed (?)
// FIXME: It's completely unclear what should happen here, but these results
// seem at least plausible:
TAuto<DecltypeAuto> ada;
TAutoPtr<DecltypeAuto> apda;
// Perhaps this case should be invalid, as there are valid 'decltype(auto)'
// parameters (such as 'user-defined-type &') that are not valid 'auto'
// parameters.
TDecltypeAuto<Auto> daa;
TDecltypeAuto<AutoPtr> daap; // FIXME: should probably be ill-formed
int n;
template<auto A, decltype(A) B = &n> struct SubstFailure;
TInt<SubstFailure> isf; // FIXME: this should be ill-formed
TIntPtr<SubstFailure> ipsf;
}
|