clang/test/CXX/temp/temp.decls/temp.variadic/partial-ordering.cpp

   1 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
   2 // expected-no-diagnostics
   3
   4 // Various tests related to partial ordering of variadic templates.
   5 template<typename ...Types> struct tuple;
   6
   7 template<typename Tuple>
   8 struct X1 {
   9   static const unsigned value = 0;
  10 };
  11
  12 template<typename Head, typename ...Tail>
  13 struct X1<tuple<Head, Tail...> > {
  14   static const unsigned value = 1;
  15 };
  16
  17 template<typename Head, typename ...Tail>
  18 struct X1<tuple<Head, Tail&...> > {
  19   static const unsigned value = 2;
  20 };
  21
  22 template<typename Head, typename ...Tail>
  23 struct X1<tuple<Head&, Tail&...> > {
  24   static const unsigned value = 3;
  25 };
  26
  27 int check0[X1<tuple<>>::value == 0? 1 : -1];
  28 int check1[X1<tuple<int>>::value == 2? 1 : -1];
  29 int check2[X1<tuple<int, int>>::value == 1? 1 : -1];
  30 int check3[X1<tuple<int, int&>>::value == 2? 1 : -1];
  31 int check4[X1<tuple<int&, int&>>::value == 3? 1 : -1];
  32
  33 // Partial ordering of function templates.
  34 template<typename T1, typename T2, typename ...Rest>
  35 int &f0(T1, T2, Rest...);
  36
  37 template<typename T1, typename T2>
  38 float &f0(T1, T2);
  39
  40 void test_f0() {
  41   int &ir1 = f0(1, 2.0, 'a');
  42   float &fr1 = f0(1, 2.0);
  43 }
  44
  45 template<typename T1, typename T2, typename ...Rest>
  46 int &f1(T1, T2, Rest...);
  47
  48 template<typename T1, typename T2>
  49 float &f1(T1, T2, ...);
  50
  51 void test_f1() {
  52   int &ir1 = f1(1, 2.0, 'a');
  53 }
  54
  55 template<typename T1, typename T2, typename ...Rest>
  56 int &f2(T1, T2, Rest...);
  57
  58 float &f2(...);
  59
  60 void test_f2() {
  61   int &ir1 = f2(1, 2.0, 'a');
  62 }