gcc/testsuite/g++.dg/cpp0x/trailing1.C

   1 // Tests for late-specified return type.
   2 // { dg-do compile { target c++11 } }
   3 // { dg-options "-fabi-version=5" }
   4
   5 auto f() -> int
   6 {
   7   return 0;
   8 }
   9
  10 template<class T, class U>
  11 auto add(T t, U u) -> decltype (t+u)
  12 {
  13   return t+u;
  14 }
  15
  16 template<class T, class U>
  17 decltype(T()+U()) add2(T t, U u)
  18 {
  19   return t+u;
  20 }
  21
  22 template <class T, class U>
  23 U ag (T, U)
  24 {
  25   return U();
  26 }
  27
  28 template<class T, class U>
  29 auto add3(T t, U u) -> decltype (ag(t,u))
  30 {
  31   return ag(t,u);
  32 }
  33
  34 template<class T, class U>
  35 decltype(*(T*)0+*(U*)0) add4(T t, U u)
  36 {
  37   return t+u;
  38 }
  39
  40 template <class T>
  41 struct A
  42 {
  43   T f() { return T(); }
  44   template <class U>
  45   T g() { return T(); }
  46   template <class V>
  47   struct B
  48   {
  49     int MEM;
  50   };
  51 };
  52
  53 template <class T>
  54 auto f(T* t) -> decltype (t->f())
  55 {
  56   return t->f();
  57 }
  58
  59 template <class T>
  60 auto g(T t) -> decltype (t.f())
  61 {
  62   return t.f();
  63 }
  64
  65 template <class T, class U>
  66 auto h(T t, U u) -> decltype (t.template g<U>())
  67 {
  68   return t.template g<U>();
  69 }
  70
  71 struct D { };
  72 struct C: public A<int>::B<D>
  73 {
  74 };
  75
  76 template <class T, class U, class V>
  77 auto k(T t, U u, V v) -> decltype (t.U::template B<V>::MEM)
  78 {
  79   return t.U::template B<V>::MEM;
  80 }
  81
  82 template <class T>
  83 auto l(T t) -> decltype (t)
  84 {
  85   return t;
  86 }
  87
  88 template <class T, T u>
  89 auto m(T t) -> decltype (u)
  90 {
  91   return t;
  92 }
  93
  94 A<int> a, *p;
  95
  96 int main()
  97 {
  98   // { dg-final { scan-assembler  "_Z3addIidEDTplfp_fp0_ET_T0_" } }
  99   auto i = add(1, 2.0);
 100   // { dg-final { scan-assembler "_Z4add4IidEDTpldecvPT_Li0EdecvPT0_Li0EES0_S2_" } }
 101   auto i4 = add4(1, 2.0);
 102   // { dg-final { scan-assembler "_Z4add2IidEDTplcvT__EcvT0__EES0_S1_" } }
 103   auto i2 = add2(1, 2.0);
 104   // { dg-final { scan-assembler "_Z4add3IidEDTcl2agfp_fp0_EET_T0_" } }
 105   auto i3 = add3(1, 2.0);
 106   // { dg-final { scan-assembler "_Z1fI1AIiEEDTclptfp_1fEEPT_" } }
 107   f(p);
 108   // { dg-final { scan-assembler "_Z1gI1AIiEEDTcldtfp_1fEET_" } }
 109   g(a);
 110   // { dg-final { scan-assembler "_Z1hI1AIiEdEDTcldtfp_1gIT0_EEET_S2_" } }
 111   h(a,1.0);
 112   // { dg-final { scan-assembler "_Z1kI1C1AIiE1DEDtdtfp_srNT0_1BIT1_EE3MEMET_S4_S6_" } }
 113   k( C(), A<int>(), D() );
 114   // { dg-final { scan-assembler "_Z1lIiEDtfp_ET_" } }
 115   l(1);
 116   // { dg-final { scan-assembler "_Z1mIiLi1EEDtT0_ET_" } }
 117   m<int,1>(1);
 118 }