is_same.qbk

来自「Boost provides free peer-reviewed portab」· QBK 代码 · 共 39 行

[/ 
  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_same is_same]
   template <class T, class U>
   struct is_same : public __tof {};
  
__inherit If T and U are the same types then inherits from 
__true_type, otherwise inherits from __false_type.

__header ` #include <boost/type_traits/is_same.hpp>` or ` #include <boost/type_traits.hpp>`

__compat If the compiler does not support partial-specialization of class templates, 
then this template can not be used with abstract, incomplete or function types.

__examples

[:`is_same<int, int>` inherits from `__true_type`.]

[:`is_same<int, int>::type` is the type `__true_type`.]

[:`is_same<int, int>::value` is an integral constant 
expression that evaluates to /true/.]

[:`is_same<int const, int>::value` is an integral constant 
expression that evaluates to /false/.]

[:`is_same<int&, int>::value` is an integral constant 
expression that evaluates to /false/.]

[:`is_same<T>::value_type` is the type `bool`.]

[endsect]