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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_polymorphic is_polymorphic] | |
9 | template <class T> | |
10 | struct is_polymorphic : public __tof {}; | |
11 | ||
12 | __inherit If T is a (possibly cv-qualified) polymorphic type | |
13 | then inherits from __true_type, | |
14 | otherwise inherits from __false_type. Type `T` must be a complete type. | |
15 | ||
16 | __std_ref 10.3. | |
17 | ||
18 | __compat The implementation requires some knowledge of the compilers ABI, | |
19 | it does actually seem to work with the majority of compilers though. | |
20 | ||
21 | __header ` #include <boost/type_traits/is_polymorphic.hpp>` or ` #include <boost/type_traits.hpp>` | |
22 | ||
23 | __examples | |
24 | ||
25 | [: Given: `class poly{ virtual ~poly(); };` ] | |
26 | ||
27 | [:`is_polymorphic<poly>` inherits from `__true_type`.] | |
28 | ||
29 | [:`is_polymorphic<poly const>::type` is the type `__true_type`.] | |
30 | ||
31 | [:`is_polymorphic<poly>::value` is an integral constant | |
32 | expression that evaluates to /true/.] | |
33 | ||
34 | [:`is_polymorphic<T>::value_type` is the type `bool`.] | |
35 | ||
36 | [endsect] | |
37 |