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
|
// PR c++/44907
// { dg-do compile { target c++11 } }
#include <utility>
struct A { };
struct B
: public A { };
struct C
: public A { };
struct D
: public B, public C { };
template<typename From, typename To>
class mini_is_convertible
{
typedef char one;
typedef struct { char arr[2]; } two;
template<typename To1>
static void test_aux(To1);
template<typename To1, typename From1>
static decltype(test_aux<To1>(std::declval<From1>()), one())
test(int);
template<typename, typename>
static two test(...);
public:
static const bool value = sizeof(test<To, From>(0)) == 1;
};
template<typename From, typename To>
const bool mini_is_convertible<From, To>::value;
static_assert (!mini_is_convertible<D*, A*>::value, "");
static_assert (!mini_is_convertible<A*, D*>::value, "");
static_assert (!mini_is_convertible<D&, A&>::value, "");
static_assert (!mini_is_convertible<A&, D&>::value, "");
static_assert (!mini_is_convertible<D, A>::value, "");
static_assert (!mini_is_convertible<A, D>::value, "");
|
