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1 | [/ |
2 | Copyright 2007 John Maddock. | |
3 | Distributed under the Boost Software License, Version 1.0. | |
4 | (See accompanying file LICENSE_1_0.txt or copy at | |
5 | http://www.boost.org/LICENSE_1_0.txt). | |
6 | ] | |
7 | ||
8 | [section:is_object is_object] | |
9 | template <class T> | |
10 | struct is_object : public __tof {}; | |
11 | ||
12 | __inherit If T is a (possibly cv-qualified) object type | |
13 | then inherits from __true_type, | |
14 | otherwise inherits from __false_type. All types are object types except | |
15 | references, void, and function types. | |
16 | ||
17 | __std_ref 3.9p9. | |
18 | ||
19 | [all_compilers] | |
20 | ||
21 | __header ` #include <boost/type_traits/is_object.hpp>` or ` #include <boost/type_traits.hpp>` | |
22 | ||
23 | __examples | |
24 | ||
25 | [:`is_object<int>` inherits from `__true_type`.] | |
26 | ||
27 | [:`is_object<int*>::type` is the type `__true_type`.] | |
28 | ||
29 | [:`is_object<int (*)(void)>::value` is an integral constant | |
30 | expression that evaluates to /true/.] | |
31 | ||
32 | [:`is_object<int (MyClass::*)(void)const>::value` is an integral constant | |
33 | expression that evaluates to /true/.] | |
34 | ||
35 | [:`is_object<int &>::value` is an integral constant | |
36 | expression that evaluates to /false/: reference types are not objects] | |
37 | ||
38 | [:`is_object<int (double)>::value` is an integral constant | |
39 | expression that evaluates to /false/: function types are not objects] | |
40 | ||
41 | [:`is_object<const void>::value` is an integral constant | |
42 | expression that evaluates to /false/: void is not an object type] | |
43 | ||
44 | [:`is_object<T>::value_type` is the type `bool`.] | |
45 | ||
46 | [endsect] | |
47 |