boost/type_traits/is_void.hpp

   1
   2 //  (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
   3 //  Use, modification and distribution are subject to the Boost Software License,
   4 //  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   5 //  http://www.boost.org/LICENSE_1_0.txt).
   6 //
   7 //  See http://www.boost.org/libs/type_traits for most recent version including documentation.
   8
   9 #ifndef BOOST_TT_IS_VOID_HPP_INCLUDED
  10 #define BOOST_TT_IS_VOID_HPP_INCLUDED
  11
  12 #include <boost/config.hpp>
  13
  14 // should be the last #include
  15 #include <boost/type_traits/detail/bool_trait_def.hpp>
  16
  17 namespace boost {
  18
  19 //* is a type T void - is_void<T>
  20 #if defined( __CODEGEARC__ )
  21 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_void,T,__is_void(T))
  22 #else
  23 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_void,T,false)
  24 BOOST_TT_AUX_BOOL_TRAIT_SPEC1(is_void,void,true)
  25
  26 #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
  27 BOOST_TT_AUX_BOOL_TRAIT_SPEC1(is_void,void const,true)
  28 BOOST_TT_AUX_BOOL_TRAIT_SPEC1(is_void,void volatile,true)
  29 BOOST_TT_AUX_BOOL_TRAIT_SPEC1(is_void,void const volatile,true)
  30 #endif
  31
  32 #endif  // non-CodeGear implementation
  33
  34 } // namespace boost
  35
  36 #include <boost/type_traits/detail/bool_trait_undef.hpp>
  37
  38 #endif // BOOST_TT_IS_VOID_HPP_INCLUDED