ceph/src/boost/libs/type_traits/doc/is_same.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_same is_same]
   9    template <class T, class U>
  10    struct is_same : public __tof {};
  11
  12 __inherit If T and U are the same types then inherits from
  13 __true_type, otherwise inherits from __false_type.
  14
  15 __header ` #include <boost/type_traits/is_same.hpp>` or ` #include <boost/type_traits.hpp>`
  16
  17 [all_compilers]
  18
  19
  20 __examples
  21
  22 [:`is_same<int, int>` inherits from `__true_type`.]
  23
  24 [:`is_same<int, int>::type` is the type `__true_type`.]
  25
  26 [:`is_same<int, int>::value` is an integral constant
  27 expression that evaluates to /true/.]
  28
  29 [:`is_same<int const, int>::value` is an integral constant
  30 expression that evaluates to /false/.]
  31
  32 [:`is_same<int&, int>::value` is an integral constant
  33 expression that evaluates to /false/.]
  34
  35 [:`is_same<T, T>::value_type` is the type `bool`.]
  36
  37 [endsect]
  38
  39