1 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
3 template<typename ...Types> struct tuple;
4 template<unsigned> struct unsigned_c;
6 template<typename T, typename U>
8 static const bool value = false;
12 struct is_same<T, T> {
13 static const bool value = true;
16 namespace PackExpansionNotAtEnd {
17 template<typename T, typename U>
18 struct tuple_same_with_int {
19 static const bool value = false;
22 template<typename ...Types>
23 struct tuple_same_with_int<tuple<Types...>, tuple<Types..., int>> {
24 static const bool value = true;
27 int tuple_same_with_int_1[tuple_same_with_int<tuple<int, float, double>,
28 tuple<int, float, double, int>
31 template<typename ... Types> struct UselessPartialSpec;
33 template<typename ... Types, // expected-note{{non-deducible template parameter 'Types'}}
34 typename Tail> // expected-note{{non-deducible template parameter 'Tail'}}
35 struct UselessPartialSpec<Types..., Tail>; // expected-warning{{class template partial specialization contains template parameters that cannot be deduced; this partial specialization will never be used}}
38 namespace DeduceNonTypeTemplateArgsInArray {
39 template<typename ...ArrayTypes>
42 template<typename ...ElementTypes, unsigned ...Bounds>
43 struct split_arrays<ElementTypes[Bounds]...> {
44 typedef tuple<ElementTypes...> element_types;
46 // FIXME: Would like to have unsigned_tuple<Bounds...> here.
47 typedef tuple<unsigned_c<Bounds>...> bounds_types;
50 int check1[is_same<split_arrays<int[1], float[2], double[3]>::element_types,
51 tuple<int, float, double>>::value? 1 : -1];
52 int check2[is_same<split_arrays<int[1], float[2], double[3]>::bounds_types,
53 tuple<unsigned_c<1>, unsigned_c<2>, unsigned_c<3>>
57 namespace DeduceWithDefaultArgs {
58 template<template<typename...> class Container> void f(Container<int>); // expected-note {{substitution failure [with Container = X]}}
59 template<typename, typename = int> struct X {};
61 // OK, use default argument for the second template parameter.
66 f(X<int, double>{}); // expected-error {{no matching function for call to 'f'}}