is_empty.pass.cpp revision c52f43e72dfcea03037729649da84c23b3beb04a 
1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// type_traits
11
12// is_empty
13
14#include <type_traits>
15
16template <class T>
17void test_is_empty()
18{
19    static_assert( std::is_empty<T>::value, "");
20    static_assert( std::is_empty<const T>::value, "");
21    static_assert( std::is_empty<volatile T>::value, "");
22    static_assert( std::is_empty<const volatile T>::value, "");
23}
24
25template <class T>
26void test_is_not_empty()
27{
28    static_assert(!std::is_empty<T>::value, "");
29    static_assert(!std::is_empty<const T>::value, "");
30    static_assert(!std::is_empty<volatile T>::value, "");
31    static_assert(!std::is_empty<const volatile T>::value, "");
32}
33
34class Empty
35{
36};
37
38class NotEmpty
39{
40    virtual ~NotEmpty();
41};
42
43union Union {};
44
45struct bit_zero
46{
47    int :  0;
48};
49
50int main()
51{
52    test_is_not_empty<void>();
53    test_is_not_empty<int&>();
54    test_is_not_empty<int>();
55    test_is_not_empty<double>();
56    test_is_not_empty<int*>();
57    test_is_not_empty<const int*>();
58    test_is_not_empty<char[3]>();
59    test_is_not_empty<char[3]>();
60    test_is_not_empty<Union>();
61    test_is_not_empty<NotEmpty>();
62
63    test_is_empty<Empty>();
64    test_is_empty<bit_zero>();
65}
66