ceph/src/boost/libs/type_traits/doc/is_object.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_object is_object]
   9    template <class T>
  10    struct is_object : public __tof {};
  11
  12 __inherit If T is a (possibly cv-qualified) object type
  13 then inherits from __true_type,
  14 otherwise inherits from __false_type.  All types are object types except
  15 references, void, and function types.
  16
  17 __std_ref 3.9p9.
  18
  19 [all_compilers]
  20
  21 __header ` #include <boost/type_traits/is_object.hpp>` or ` #include <boost/type_traits.hpp>`
  22
  23 __examples
  24
  25 [:`is_object<int>` inherits from `__true_type`.]
  26
  27 [:`is_object<int*>::type` is the type `__true_type`.]
  28
  29 [:`is_object<int (*)(void)>::value` is an integral constant
  30 expression that evaluates to /true/.]
  31
  32 [:`is_object<int (MyClass::*)(void)const>::value` is an integral constant
  33 expression that evaluates to /true/.]
  34
  35 [:`is_object<int &>::value` is an integral constant
  36 expression that evaluates to /false/: reference types are not objects]
  37
  38 [:`is_object<int (double)>::value` is an integral constant
  39 expression that evaluates to /false/: function types are not objects]
  40
  41 [:`is_object<const void>::value` is an integral constant
  42 expression that evaluates to /false/: void is not an object type]
  43
  44 [:`is_object<T>::value_type` is the type `bool`.]
  45
  46 [endsect]
  47