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
|
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11
// <experimental/type_traits>
#include <experimental/type_traits>
#include <string>
#include "test_macros.h"
namespace ex = std::experimental;
template <typename T>
using hasFoo = typename T::Foo;
struct yesFoo {
using Foo = int;
};
struct noFoo {
};
template <typename T, typename Res>
void test() {
static_assert( std::is_same<Res, typename ex::detected_or <double, hasFoo, T>::type>::value, "" );
static_assert( std::is_same<Res, typename ex::detected_or_t<double, hasFoo, T> >::value, "" );
}
int main () {
test<yesFoo, int>();
test<noFoo, double>();
}
|
