clang/test/Modules/template-default-args.cpp

   1 // RUN: rm -rf %t
   2 // RUN: %clang_cc1 -fmodules -fimplicit-module-maps -verify -fmodules-cache-path=%t -fno-modules-error-recovery -I %S/Inputs/template-default-args -std=c++11 %s -DBEGIN= -DEND=
   3 // RUN: %clang_cc1 -fmodules -fimplicit-module-maps -verify -fmodules-cache-path=%t -fno-modules-error-recovery -I %S/Inputs/template-default-args -std=c++11 %s -DBEGIN="namespace N {" -DEND="}"
   4
   5 BEGIN
   6 template<typename T> struct A;
   7 template<typename T> struct B;
   8 template<typename T> struct C;
   9 template<typename T = int> struct D;
  10 template<typename T = int> struct E {};
  11 template<typename T> struct H {};
  12 template<typename T = int, typename U = int> struct I {};
  13 END
  14
  15 #include "b.h"
  16 #include "d.h"
  17
  18 BEGIN
  19 template<typename T = int> struct A {};
  20 template<typename T> struct B {};
  21 template<typename T = int> struct B;
  22 template<typename T = int> struct C;
  23 template<typename T> struct D {};
  24 template<typename T> struct F {};
  25 template<typename T> struct G {};
  26 template<typename T> struct J {};
  27 template<typename T = int> struct J;
  28 struct K : J<> {};
  29 END
  30
  31 #include "c.h"
  32
  33 BEGIN
  34 A<> a;
  35 B<> b;
  36 extern C<> c;
  37 D<> d;
  38 E<> e;
  39 F<> f;
  40 G<> g; // expected-error {{missing '#include "a.h"'; default argument of 'G' must be defined before it is used}}
  41 // expected-note@a.h:7 {{default argument declared here is not reachable}}
  42 H<> h; // expected-error {{missing '#include "a.h"'; default argument of 'H' must be defined before it is used}}
  43 // expected-note@a.h:8 {{default argument declared here is not reachable}}
  44 I<> i;
  45 L<> *l;
  46 END
  47
  48 namespace DeferredLookup {
  49   template<typename T, typename U = T> using X = U;
  50   template<typename T> void f() { (void) X<T>(); }
  51   template<typename T> int n = X<T>(); // expected-warning {{extension}}
  52   template<typename T> struct S { X<T> xt; enum E : int; };
  53   template<typename T> enum S<T>::E : int { a = X<T>() };
  54
  55   void test() {
  56     f<int>();
  57     n<int> = 1;
  58     S<int> s;
  59     S<int>::E e = S<int>::E::a;
  60
  61     Indirect::B<int>::C<int> indirect;
  62   }
  63 }