clang/test/CXX/dcl.decl/dcl.meaning/dcl.fct/p13.cpp

   1 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -fcxx-exceptions -fexceptions -verify %s
   2
   3 // When it is part of a parameter-declaration-clause, the parameter
   4 // pack is a function parameter pack.
   5 template<typename ...Types>
   6 void f0(Types ...args);
   7
   8 template<typename ...Types>
   9 void f1(const Types &...args);
  10
  11 // [ Note: Otherwise, the parameter-declaration is part of a
  12 // template-parameter-list and the parameter pack is a template
  13 // parameter pack; see 14.1. -- end note ]
  14 template<int ...N>
  15 struct X0 { };
  16
  17 template<typename ...Types>
  18 struct X1 {
  19   template<Types ...Values> struct Inner;
  20 };
  21
  22 // A declarator-id or abstract-declarator containing an ellipsis shall
  23 // only be used in a parameter-declaration.
  24 int (...f2)(int); // expected-error{{only function and template parameters can be parameter packs}}
  25
  26 void f3() {
  27   int ...x; // expected-error{{only function and template parameters can be parameter packs}}
  28   if (int ...y = 17) { }  // expected-error{{only function and template parameters can be parameter packs}}
  29
  30   for (int ...z = 0; z < 10; ++z) { }  // expected-error{{only function and template parameters can be parameter packs}}
  31
  32   try {
  33   } catch (int ...e) { // expected-error{{only function and template parameters can be parameter packs}}
  34   }
  35 }
  36
  37 template<typename ...Types>
  38 struct X2 {
  39   Types ...members; // expected-error{{only function and template parameters can be parameter packs}} \
  40                     // expected-error{{data member type contains unexpanded parameter pack}}
  41 };
  42
  43 // The type T of the declarator-id of the function parameter pack
  44 // shall contain a template parameter pack; each template parameter
  45 // pack in T is expanded by the function parameter pack.
  46 template<typename T>
  47 void f4(T ...args); // expected-error{{type 'T' of function parameter pack does not contain any unexpanded parameter packs}}
  48
  49 void f4i(int ... x); // expected-error{{type 'int' of function parameter pack does not contain any unexpanded parameter packs}}
  50 void f4i0(int ...);
  51
  52 namespace array_type {
  53 template<typename T>
  54 void a(T[] ... x); // expected-error{{expected ')'}} expected-note{{to match this '('}}
  55
  56 template<typename T>
  57 void b(T[] ...);
  58
  59 template<typename T>
  60 void c(T ... []); // expected-error {{expected expression}} \
  61                   // expected-error {{'T' does not refer to the name of a parameter pack}} \
  62                   // expected-warning {{pack indexing is a C++2c extension}}
  63
  64 template<typename T>
  65 void d(T ... x[]); // expected-error{{type 'T[]' of function parameter pack does not contain any unexpanded parameter packs}}
  66
  67 void ai(int[] ... x); // expected-error{{expected ')'}} expected-note{{to match this '('}}
  68 void bi(int[] ...);
  69 void ci(int ... []); // expected-error{{type 'int[]' of function parameter pack does not contain any unexpanded parameter packs}}
  70 void di(int ... x[]); // expected-error{{type 'int[]' of function parameter pack does not contain any unexpanded parameter packs}}
  71 }
  72
  73 void f5a(auto fp(int)->unk ...) {} // expected-error{{unknown type name 'unk'}}
  74 void f5b(auto fp(int)->auto ...) {} // expected-error{{'auto' not allowed in function return type}}
  75 void f5c(auto fp()->...) {} // expected-error{{expected a type}}
  76
  77 // FIXME: Expand for function and member pointer types.
  78
  79
  80
  81