clang/test/CXX/temp/temp.decls/temp.variadic/deduction.cpp

   1 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
   2 // expected-no-diagnostics
   3
   4 namespace DeductionForInstantiation {
   5   template<unsigned I, typename ...Types>
   6   struct X { };
   7
   8   template<typename ...Types>
   9   void f0(X<sizeof...(Types), Types&...>) { }
  10
  11   // No explicitly-specified arguments
  12   template void f0(X<0>);
  13   template void f0(X<1, int&>);
  14   template void f0(X<2, int&, short&>);
  15
  16   // One explicitly-specified argument
  17   template void f0<float>(X<1, float&>);
  18   template void f0<double>(X<1, double&>);
  19
  20   // Two explicitly-specialized arguments
  21   template void f0<char, unsigned char>(X<2, char&, unsigned char&>);
  22   template void f0<signed char, char>(X<2, signed char&, char&>);
  23
  24   // FIXME: Extension of explicitly-specified arguments
  25   //  template void f0<short, int>(X<3, short&, int&, long&>);
  26 }
  27
  28 namespace DeductionWithConversion {
  29   template<char...> struct char_values {
  30     static const unsigned value = 0;
  31   };
  32
  33   template<int C1, char C3>
  34   struct char_values<C1, 12, C3> {
  35     static const unsigned value = 1;
  36   };
  37
  38   int check0[char_values<1, 12, 3>::value == 1? 1 : -1];
  39
  40   template<int...> struct int_values {
  41     static const unsigned value = 0;
  42   };
  43
  44   template<unsigned char C1, unsigned char C3>
  45   struct int_values<C1, 12, C3> {
  46     static const unsigned value = 1;
  47   };
  48
  49   int check1[int_values<256, 12, 3>::value == 0? 1 : -1];
  50   int check2[int_values<3, 12, 3>::value == 1? 1 : -1];
  51 }