63 lines · cpp
1// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s2// expected-no-diagnostics3 4// Various tests related to partial ordering of variadic templates.5template<typename ...Types> struct tuple;6 7template<typename Tuple> 8struct X1 {9 static const unsigned value = 0;10};11 12template<typename Head, typename ...Tail>13struct X1<tuple<Head, Tail...> > {14 static const unsigned value = 1;15};16 17template<typename Head, typename ...Tail>18struct X1<tuple<Head, Tail&...> > {19 static const unsigned value = 2;20};21 22template<typename Head, typename ...Tail>23struct X1<tuple<Head&, Tail&...> > {24 static const unsigned value = 3;25};26 27int check0[X1<tuple<>>::value == 0? 1 : -1];28int check1[X1<tuple<int>>::value == 2? 1 : -1];29int check2[X1<tuple<int, int>>::value == 1? 1 : -1];30int check3[X1<tuple<int, int&>>::value == 2? 1 : -1];31int check4[X1<tuple<int&, int&>>::value == 3? 1 : -1];32 33// Partial ordering of function templates.34template<typename T1, typename T2, typename ...Rest>35int &f0(T1, T2, Rest...);36 37template<typename T1, typename T2>38float &f0(T1, T2);39 40void test_f0() {41 int &ir1 = f0(1, 2.0, 'a');42 float &fr1 = f0(1, 2.0);43}44 45template<typename T1, typename T2, typename ...Rest>46int &f1(T1, T2, Rest...);47 48template<typename T1, typename T2>49float &f1(T1, T2, ...);50 51void test_f1() {52 int &ir1 = f1(1, 2.0, 'a');53}54 55template<typename T1, typename T2, typename ...Rest>56int &f2(T1, T2, Rest...);57 58float &f2(...);59 60void test_f2() {61 int &ir1 = f2(1, 2.0, 'a');62}63