ceph/src/boost/libs/type_traits/doc/is_signed.qbk

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