1 // RUN: %clang_cc1 -std=c++1y -verify -fsyntax-only -fblocks %s
2 // RUN: %clang_cc1 -std=c++1y -verify -fsyntax-only -fblocks -fdelayed-template-parsing %s -DDELAYED_TEMPLATE_PARSING
3 // RUN: %clang_cc1 -std=c++1y -verify -fsyntax-only -fblocks -fms-extensions %s -DMS_EXTENSIONS
4 // RUN: %clang_cc1 -std=c++1y -verify -fsyntax-only -fblocks -fdelayed-template-parsing -fms-extensions %s -DMS_EXTENSIONS -DDELAYED_TEMPLATE_PARSING
5
6 namespace explicit_argument_variadics {
7
8
print(Ts...)9 template<class ... Ts> void print(Ts ... ) { }
10
11 struct X { };
12 struct Y { };
13 struct Z { };
14
test()15 int test() {
16 {
17 auto L = [](auto ... as) { };
18 L.operator()<bool>(true);
19 }
20 {
21 auto L = [](auto a) { };
22 L.operator()<bool>(false);
23 }
24 {
25 auto L = [](auto a, auto b) { };
26 L.operator()<bool>(false, 'a');
27 }
28 {
29 auto L = [](auto a, auto b) { };
30 L.operator()<bool, char>(false, 'a');
31 }
32 {
33 auto L = [](auto a, auto b, auto ... cs) { };
34 L.operator()<bool, char>(false, 'a');
35 L.operator()<bool, char, const char*>(false, 'a', "jim");
36 }
37
38 {
39 auto L = [](auto ... As) {
40 };
41 L.operator()<bool, double>(false, 3.14, "abc");
42 }
43 {
44 auto L = [](auto A, auto B, auto ... As) {
45 };
46 L.operator()<bool>(false, 3.14, "abc");
47 L.operator()<bool, char>(false, 3.14, "abc"); //expected-warning{{implicit conversion}}
48 L.operator()<X, Y, bool, Z>(X{}, Y{}, 3.14, Z{}, X{}); //expected-warning{{implicit conversion}}
49 }
50 {
51 auto L = [](auto ... As) {
52 print("\nL::As = ", As ...);
53 return [](decltype(As) ... as, auto ... Bs) {
54 print("\nL::Inner::as = ", as ...);
55 print("\nL::Inner::Bs = ", Bs ...);
56 return 4;
57 };
58 };
59 auto M = L.operator()<bool, double>(false, 3.14, "abc");
60 M(false, 6.26, "jim", true);
61 M.operator()<bool>(true, 6.26, "jim", false, 3.14);
62 }
63 {
64 auto L = [](auto A, auto ... As) {
65 print("\nL::As = ", As ...);
66 return [](decltype(As) ... as, decltype(A) a, auto ... Bs) {
67 print("\nL::Inner::as = ", as ...);
68 print("\nL::Inner::Bs = ", Bs ...);
69 return 4;
70 };
71 };
72 auto M = L.operator()<bool, double>(false, 3.14, "abc");
73 M(6.26, "jim", true);
74 M.operator()<X>(6.26, "jim", false, X{}, Y{}, Z{});
75 }
76
77 return 0;
78 }
79 int run = test();
80 } // end ns explicit_argument_extension
81
82
83
84 #ifdef PR18499_FIXED
85 namespace variadic_expansion {
86 void f(int &, char &);
87
g(T &...t)88 template <typename ... T> void g(T &... t) {
89 f([&a(t)]()->decltype(auto) {
90 return a;
91 }() ...);
92 f([&a(f([&b(t)]()->decltype(auto) { return b; }()...), t)]()->decltype(auto) {
93 return a;
94 }()...);
95 }
96
h(int i,char c)97 void h(int i, char c) { g(i, c); }
98 }
99 #endif
100
101 namespace PR33082 {
a()102 template<int ...I> void a() {
103 int arr[] = { [](auto ...K) { (void)I; } ... }; // expected-error {{no viable conversion}} expected-note {{candidate}}
104 }
105
106 template<typename ...T> struct Pack {};
b(Pack<U...>,T...t)107 template<typename ...T, typename ...U> void b(Pack<U...>, T ...t) {
108 int arr[] = {[t...]() { // expected-error 2{{cannot initialize an array element of type 'int' with}}
109 U u;
110 return u;
111 }()...};
112 }
113
c()114 void c() {
115 int arr[] = {[](auto... v) {
116 v; // expected-error {{unexpanded parameter pack 'v'}}
117 }...}; // expected-error {{pack expansion does not contain any unexpanded parameter packs}}
118 }
119
run()120 void run() {
121 a<1>(); // expected-note {{instantiation of}}
122 b(Pack<int*, float*>(), 1, 2, 3); // expected-note {{instantiation of}}
123 }
124 }
125
pr42587()126 void pr42587() {
127 (void)[](auto... args) -> decltype(args) {}; // expected-error {{type contains unexpanded parameter pack}}
128 (void)[](auto... args, int = args) {}; // expected-error {{default argument contains unexpanded parameter pack}}
129 (void)[](auto... args, decltype(args)) {}; // expected-error {{type contains unexpanded parameter pack}}
130 (void)[](auto... args, decltype(args)...) {}; // (ok)
131 (void)[](auto... args, int = [=] { return args; }()) {}; // expected-error {{default argument contains unexpanded parameter pack}}
132 (void)([]<typename ...T> (T t) {} + ...); // expected-error {{contains unexpanded parameter pack 'T'}} expected-error {{does not contain any unexpanded}} expected-warning 0-2{{extension}}
133 (void)([]<int ...N> (int k = N) {} + ...); // expected-error {{contains unexpanded parameter pack 'N'}} expected-error {{does not contain any unexpanded}} expected-warning 0-2{{extension}}
134 (void)([]<template<typename> typename ...T> (T<int>) {} + ...); // expected-error {{contains unexpanded parameter pack 'T'}} expected-error {{does not contain any unexpanded}} expected-warning 0-3{{extension}}
135 }
136
__anon74c25ae41402null137 template<typename ...T> int v = {[...x = T()] { int k = x; } ...}; // expected-error {{contains unexpanded parameter pack 'x'}} expected-error {{does not contain any unexpanded}} expected-warning 0-1{{extension}}
138