libs/type_traits/doc/is_signed.qbk
[/ 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]