ceph/src/boost/libs/mpl/include/boost/mpl/eval_if.hpp

   1
   2 #ifndef BOOST_MPL_EVAL_IF_HPP_INCLUDED
   3 #define BOOST_MPL_EVAL_IF_HPP_INCLUDED
   4
   5 // Copyright Aleksey Gurtovoy 2000-2004
   6 //
   7 // Distributed under the Boost Software License, Version 1.0.
   8 // (See accompanying file LICENSE_1_0.txt or copy at
   9 // http://www.boost.org/LICENSE_1_0.txt)
  10 //
  11 // See http://www.boost.org/libs/mpl for documentation.
  12
  13 // $Id$
  14 // $Date$
  15 // $Revision$
  16
  17 #include <boost/mpl/if.hpp>
  18 #include <boost/mpl/aux_/na_spec.hpp>
  19 #include <boost/mpl/aux_/lambda_support.hpp>
  20 #include <boost/mpl/aux_/config/msvc.hpp>
  21 #include <boost/mpl/aux_/config/gcc.hpp>
  22 #include <boost/mpl/aux_/config/workaround.hpp>
  23
  24 namespace boost { namespace mpl {
  25
  26 template<
  27       typename BOOST_MPL_AUX_NA_PARAM(C)
  28     , typename BOOST_MPL_AUX_NA_PARAM(F1)
  29     , typename BOOST_MPL_AUX_NA_PARAM(F2)
  30     >
  31 struct eval_if
  32 #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \
  33      || ( BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, >= 0x0300) \
  34         && BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, BOOST_TESTED_AT(0x0304)) \
  35         )
  36 {
  37     typedef typename if_<C,F1,F2>::type f_;
  38     typedef typename f_::type type;
  39 #else
  40     : if_<C,F1,F2>::type
  41 {
  42 #endif
  43     BOOST_MPL_AUX_LAMBDA_SUPPORT(3,eval_if,(C,F1,F2))
  44 };
  45
  46 // (almost) copy & paste in order to save one more
  47 // recursively nested template instantiation to user
  48 template<
  49       bool C
  50     , typename F1
  51     , typename F2
  52     >
  53 struct eval_if_c
  54 #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \
  55      || ( BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, >= 0x0300) \
  56         && BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, BOOST_TESTED_AT(0x0304)) \
  57         )
  58 {
  59     typedef typename if_c<C,F1,F2>::type f_;
  60     typedef typename f_::type type;
  61 #else
  62     : if_c<C,F1,F2>::type
  63 {
  64 #endif
  65 };
  66
  67 BOOST_MPL_AUX_NA_SPEC(3, eval_if)
  68
  69 }}
  70
  71 #endif // BOOST_MPL_EVAL_IF_HPP_INCLUDED