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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_unsigned is_unsigned] | |
9 | ||
10 | template <class T> | |
11 | struct is_unsigned : public __tof {}; | |
12 | ||
13 | __inherit If T is an unsigned integer type or an enumerated type with an | |
14 | underlying unsigned integer type, then inherits from __true_type, | |
15 | otherwise inherits from __false_type. | |
16 | ||
17 | __std_ref 3.9.1, 7.2. | |
18 | ||
19 | [all_compilers] | |
20 | ||
21 | __header ` #include <boost/type_traits/is_unsigned.hpp>` or ` #include <boost/type_traits.hpp>` | |
22 | ||
23 | __examples | |
24 | ||
25 | [:`is_unsigned<unsigned int>` inherits from `__true_type`.] | |
26 | ||
27 | [:`is_unsigned<unsigned int const volatile>::type` is the type `__true_type`.] | |
28 | ||
29 | [:`is_unsigned<int>::value` is an integral constant | |
30 | expression that evaluates to /false/.] | |
31 | ||
32 | [:`is_unsigned<myclass>::value` is an integral constant | |
33 | expression that evaluates to /false/.] | |
34 | ||
35 | [:`is_unsigned<char>::value` is an integral constant | |
36 | expression whose value depends upon the signedness of type `char`.] | |
37 | ||
38 | [:`is_unsigned<unsigned long long>::value` is an integral constant | |
39 | expression that evaluates to /true/.] | |
40 | ||
41 | [:`is_unsigned<T>::value_type` is the type `bool`.] | |
42 | ||
43 | [endsect] | |
44 |