| [/ |
| Copyright 2007 John Maddock. |
| Distributed under the Boost Software License, Version 1.0. |
| (See accompanying file LICENSE_1_0.txt or copy at |
| http://www.boost.org/LICENSE_1_0.txt). |
| ] |
| |
| [section:is_signed is_signed] |
| |
| template <class T> |
| struct is_signed : public __tof {}; |
| |
| __inherit If T is an signed integer type or an enumerated type with an |
| underlying signed integer type, then inherits from __true_type, |
| otherwise inherits from __false_type. |
| |
| __std_ref 3.9.1, 7.2. |
| |
| __header ` #include <boost/type_traits/is_signed.hpp>` or ` #include <boost/type_traits.hpp>` |
| |
| __examples |
| |
| [:`is_signed<int>` inherits from `__true_type`.] |
| |
| [:`is_signed<int const volatile>::type` is the type `__true_type`.] |
| |
| [:`is_signed<unsigned int>::value` is an integral constant |
| expression that evaluates to /false/.] |
| |
| [:`is_signed<myclass>::value` is an integral constant |
| expression that evaluates to /false/.] |
| |
| [:`is_signed<char>::value` is an integral constant |
| expression whose value depends upon the signedness of type `char`.] |
| |
| [:`is_signed<long long>::value` is an integral constant |
| expression that evaluates to /true/.] |
| |
| [:`is_signed<T>::value_type` is the type `bool`.] |
| |
| [endsect] |
| |