1 // RUN: %clang_cc1 -std=c++0x -emit-llvm %s -o - -triple=x86_64-apple-darwin9 | FileCheck %s
2 
3 template < bool condition, typename T = void >
4 struct enable_if { typedef T type; };
5 
6 template< typename T >
7 struct enable_if< false, T > {};
8 
9 // PR5876
10 namespace Casts {
11   template< unsigned O >
12   void implicit(typename enable_if< O <= 4 >::type* = 0) {
13   }
14 
15   template< unsigned O >
16   void cstyle(typename enable_if< O <= (unsigned)4 >::type* = 0) {
17   }
18 
19   template< unsigned O >
20   void functional(typename enable_if< O <= unsigned(4) >::type* = 0) {
21   }
22 
23   template< unsigned O >
24   void static_(typename enable_if< O <= static_cast<unsigned>(4) >::type* = 0) {
25   }
26 
27   template< typename T >
28   void auto_(decltype(new auto(T()))) {
29   }
30 
31   // FIXME: Test const_cast, reinterpret_cast, dynamic_cast, which are
32   // a bit harder to use in template arguments.
33   template <unsigned N> struct T {};
34 
35   template <int N> T<N> f() { return T<N>(); }
36 
37   // CHECK: define weak_odr void @_ZN5Casts8implicitILj4EEEvPN9enable_ifIXleT_Li4EEvE4typeE
38   template void implicit<4>(void*);
39   // CHECK: define weak_odr void @_ZN5Casts6cstyleILj4EEEvPN9enable_ifIXleT_cvjLi4EEvE4typeE
40   template void cstyle<4>(void*);
41   // CHECK: define weak_odr void @_ZN5Casts10functionalILj4EEEvPN9enable_ifIXleT_cvjLi4EEvE4typeE
42   template void functional<4>(void*);
43   // CHECK: define weak_odr void @_ZN5Casts7static_ILj4EEEvPN9enable_ifIXleT_cvjLi4EEvE4typeE
44   template void static_<4>(void*);
45 
46   // CHECK: define weak_odr void @_ZN5Casts1fILi6EEENS_1TIXT_EEEv
47   template T<6> f<6>();
48 
49   // CHECK: define weak_odr void @_ZN5Casts5auto_IiEEvDTnw_DapicvT__EEE(
50   template void auto_<int>(int*);
51 }
52 
53 namespace test1 {
54   short foo(short);
55   int foo(int);
56 
57   // CHECK: define linkonce_odr signext i16 @_ZN5test11aIsEEDTcl3foocvT__EEES1_(
58   template <class T> auto a(T t) -> decltype(foo(T())) { return foo(t); }
59 
60   // CHECK: define linkonce_odr signext i16 @_ZN5test11bIsEEDTcp3foocvT__EEES1_(
61   template <class T> auto b(T t) -> decltype((foo)(T())) { return (foo)(t); }
62 
63   void test(short s) {
64     a(s);
65     b(s);
66   }
67 }
68 
69 namespace test2 {
70   template <class T> void a(T x, decltype(x()) y) {}
71   template <class T> auto b(T x) -> decltype(x()) { return x(); }
72   template <class T> void c(T x, void (*p)(decltype(x()))) {}
73   template <class T> void d(T x, auto (*p)() -> decltype(x())) {}
74   template <class T> void e(auto (*p)(T y) -> decltype(y())) {}
75   template <class T> void f(void (*p)(T x, decltype(x()) y)) {}
76   template <class T> void g(T x, decltype(x()) y) {
77     static decltype(x()) variable;
78     variable = 0;
79   }
80   template <class T> void h(T x, decltype((decltype(x())(*)()) 0) y) {}
81   template <class T> void i(decltype((auto (*)(T x) -> decltype(x())) 0) y) {}
82 
83   float foo();
84   void bar(float);
85   float baz(float(*)());
86   void fred(float(*)(), float);
87 
88   // CHECK: define void @_ZN5test211instantiateEv
89   void instantiate() {
90     // CHECK: call void @_ZN5test21aIPFfvEEEvT_DTclfL0p_EE(
91     a(foo, 0.0f);
92     // CHECK: call float @_ZN5test21bIPFfvEEEDTclfp_EET_(
93     (void) b(foo);
94     // CHECK: call void @_ZN5test21cIPFfvEEEvT_PFvDTclfL1p_EEE(
95     c(foo, bar);
96     // CHECK: call void @_ZN5test21dIPFfvEEEvT_PFDTclfL0p_EEvE(
97     d(foo, foo);
98     // CHECK: call void @_ZN5test21eIPFfvEEEvPFDTclfp_EET_E(
99     e(baz);
100     // CHECK: call void @_ZN5test21fIPFfvEEEvPFvT_DTclfL0p_EEE(
101     f(fred);
102     // CHECK: call void @_ZN5test21gIPFfvEEEvT_DTclfL0p_EE(
103     g(foo, 0.0f);
104     // CHECK: call void @_ZN5test21hIPFfvEEEvT_DTcvPFDTclfL0p_EEvELi0EE(
105     h(foo, foo);
106     // CHECK: call void @_ZN5test21iIPFfvEEEvDTcvPFDTclfp_EET_ELi0EE(
107     i<float(*)()>(baz);
108   }
109 
110   // CHECK: store float {{.*}}, float* @_ZZN5test21gIPFfvEEEvT_DTclfL0p_EEE8variable,
111 }
112 
113 namespace test3 {
114   template <class T, class U> void a(T x, U y, decltype(x.*y) z) {}
115 
116   struct X {
117     int *member;
118   };
119 
120   // CHECK: define void @_ZN5test311instantiateEv
121   void instantiate() {
122     X x;
123     int *ip;
124     // CHECK: call void @_ZN5test31aINS_1XEMS1_PiEEvT_T0_DTdsfL0p_fL0p0_E
125     a(x, &X::member, ip);
126   }
127 }
128