1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
// DR 339
//
// Test of the use of the function call operator with SFINAE
typedef char yes_type;
struct no_type { char data[2]; };
template<typename T> T create_a();
template<typename T> struct type { };
template<bool, typename T = void> struct enable_if { typedef T type; };
template<typename T> struct enable_if<false, T> { };
template<typename F, typename T1, typename T2>
typename enable_if<sizeof(create_a<F>()(create_a<T1>(), create_a<T2>()), 1),
yes_type>::type
check_is_callable2(type<F>, type<T1>, type<T2>);
no_type check_is_callable2(...);
template<typename F, typename T1, typename T2 = T1>
struct is_callable2
{
static const bool value =
(sizeof(check_is_callable2(type<F>(), type<T1>(), type<T2>()))
== sizeof(yes_type)); // { dg-error "within this context" }
};
#define JOIN( X, Y ) DO_JOIN( X, Y )
#define DO_JOIN( X, Y ) DO_JOIN2(X,Y)
#define DO_JOIN2( X, Y ) X##Y
#ifdef __GXX_EXPERIMENTAL_CXX0X__
# define STATIC_ASSERT(Expr) static_assert(Expr, #Expr)
#else
# define STATIC_ASSERT(Expr) int JOIN(a,__LINE__)[Expr? 1 : -1]
#endif
struct A;
struct B;
struct A {
A(B);
};
struct B {
B(A);
};
struct F {
void operator()(A, A);
private:
void operator()(B, B); // { dg-error "is private" }
};
STATIC_ASSERT((is_callable2<F, B, B>::value));
|
