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1 | // Copyright David Abrahams 2004. Distributed under the Boost | |
2 | // Software License, Version 1.0. (See accompanying | |
3 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
4 | #ifndef IS_WRAPPER_DWA2004723_HPP | |
5 | # define IS_WRAPPER_DWA2004723_HPP | |
6 | ||
7 | # include <boost/python/detail/prefix.hpp> | |
8 | # include <boost/mpl/bool.hpp> | |
9 | ||
10 | namespace boost { namespace python { | |
11 | ||
12 | template <class T> class wrapper; | |
13 | ||
14 | namespace detail | |
15 | { | |
16 | typedef char (&is_not_wrapper)[2]; | |
17 | is_not_wrapper is_wrapper_helper(...); | |
18 | template <class T> | |
19 | char is_wrapper_helper(wrapper<T> const volatile*); | |
20 | ||
21 | // A metafunction returning true iff T is [derived from] wrapper<U> | |
22 | template <class T> | |
23 | struct is_wrapper | |
24 | : mpl::bool_<(sizeof(detail::is_wrapper_helper((T*)0)) == 1)> | |
25 | {}; | |
26 | ||
27 | }}} // namespace boost::python::detail | |
28 | ||
29 | #endif // IS_WRAPPER_DWA2004723_HPP |