Socket/SocketPolicy.ih

   1 // $Id$
   2 //
   3 // Copyright (C) 2006
   4 // Fraunhofer Institut fuer offene Kommunikationssysteme (FOKUS)
   5 // Kompetenzzentrum fuer Satelitenkommunikation (SatCom)
   6 //     Stefan Bund <stefan.bund@fokus.fraunhofer.de>
   7 //
   8 // This program is free software; you can redistribute it and/or modify
   9 // it under the terms of the GNU General Public License as published by
  10 // the Free Software Foundation; either version 2 of the License, or
  11 // (at your option) any later version.
  12 //
  13 // This program is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17 //
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the
  20 // Free Software Foundation, Inc.,
  21 // 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  22
  23 #ifndef IH_SocketPolicy_
  24 #define IH_SocketPolicy_ 1
  25
  26 // Custom includes
  27 #include <boost/preprocessor/seq/for_each.hpp>
  28 #include <boost/preprocessor/seq/for_each_i.hpp>
  29 #include <boost/preprocessor/seq/size.hpp>
  30 #include <boost/preprocessor/seq/pop_front.hpp>
  31 #include <boost/preprocessor/punctuation/comma_if.hpp>
  32 #include <boost/preprocessor/repetition/enum_params.hpp>
  33 #include <boost/preprocessor/repetition/enum_params_with_a_default.hpp>
  34 #include <boost/preprocessor/repetition/enum_shifted_params.hpp>
  35 #include <boost/preprocessor/cat.hpp>
  36 #include <boost/preprocessor/seq/elem.hpp>
  37 #include <boost/preprocessor/arithmetic/dec.hpp>
  38 #include <boost/preprocessor/iteration/local.hpp>
  39 #include <boost/preprocessor/control/if.hpp>
  40 #include <boost/preprocessor/comparison/equal.hpp>
  41
  42 #include <boost/type_traits.hpp>
  43 #include <boost/mpl/vector.hpp>
  44 #include <boost/mpl/fold.hpp>
  45 #include <boost/mpl/if.hpp>
  46 #include <boost/mpl/and.hpp>
  47 #include <boost/utility.hpp> // for enable_if
  48
  49 ///////////////////////////////ih.p////////////////////////////////////////
  50
  51 /// \cond disabled
  52 // Hide this code from doxygen
  53
  54 namespace senf {
  55
  56 #   define SENF_SOCKET_POLICIES_N BOOST_PP_SEQ_SIZE( SENF_SOCKET_POLICIES )
  57
  58 #   define SP_DeclareAlias(x1,x2,SomePolicy)                                             \
  59         typedef BOOST_PP_CAT(SomePolicy,Base) BOOST_PP_CAT(Unspecified,SomePolicy);
  60
  61     BOOST_PP_SEQ_FOR_EACH( SP_DeclareAlias, , SENF_SOCKET_POLICIES )
  62
  63 #   undef SP_DeclareAlias
  64
  65     struct SocketPolicyBase
  66     {
  67         virtual ~SocketPolicyBase() {}
  68
  69 #       define SP_Declare(x1,x2,SomePolicy)                                                     \
  70             virtual BOOST_PP_CAT(SomePolicy,Base) const & BOOST_PP_CAT(the,SomePolicy) () const = 0;
  71
  72         BOOST_PP_SEQ_FOR_EACH( SP_Declare, , SENF_SOCKET_POLICIES )
  73
  74 #       undef SP_Declare
  75     };
  76
  77 #   define SP_TemplateArgs(x1,x2,n,SomePolicy)                                  \
  78         BOOST_PP_COMMA_IF( n )                                                  \
  79         class BOOST_PP_CAT(SomePolicy,_) = BOOST_PP_CAT(SomePolicy,Base)
  80
  81     template < BOOST_PP_SEQ_FOR_EACH_I( SP_TemplateArgs, , SENF_SOCKET_POLICIES ) >
  82     struct SocketPolicy
  83         : public SocketPolicyBase
  84     {
  85 #   define SP_DeclarePolicyMember(x1,x2,SomePolicy)                                     \
  86         typedef BOOST_PP_CAT(SomePolicy,_) SomePolicy;                                  \
  87         SomePolicy BOOST_PP_CAT(BOOST_PP_CAT(the,SomePolicy),_);                        \
  88         BOOST_PP_CAT(SomePolicy,Base) const & BOOST_PP_CAT(the,SomePolicy) () const     \
  89             { return BOOST_PP_CAT(BOOST_PP_CAT(the,SomePolicy),_); }
  90
  91         BOOST_PP_SEQ_FOR_EACH( SP_DeclarePolicyMember, , SENF_SOCKET_POLICIES )
  92 #   undef SP_DeclarePolicyMember
  93
  94         static void checkBaseOf(SocketPolicyBase const & other);
  95     };
  96
  97 #   undef SP_TemplateArgs
  98
  99 namespace impl {
 100
 101     struct nil {};
 102
 103     template <int N>
 104     struct SocketPolicy_rv
 105     { int v[N+1]; };
 106
 107     template <class Base, class Policy, int N>
 108     struct MakeSocketPolicy_merge
 109     {};
 110
 111 #   define SP_DeclareMakeSocketPolicy_merge_member(r,n,m,SomePolicy)            \
 112         BOOST_PP_COMMA_IF( m )                                                  \
 113         BOOST_PP_IIF( BOOST_PP_EQUAL(n,m), Policy, typename Base::SomePolicy )
 114
 115 #    define BOOST_PP_LOCAL_LIMITS (0, BOOST_PP_DEC( SENF_SOCKET_POLICIES_N ) )
 116 #    define BOOST_PP_LOCAL_MACRO(n)                                                                                     \
 117         SocketPolicy_rv<n> MakeSocketPolicy_merge_(BOOST_PP_CAT( BOOST_PP_SEQ_ELEM( n, SENF_SOCKET_POLICIES ),Base)*);  \
 118                                                                                                                         \
 119         template <class Base, class Policy>                                                                             \
 120         struct MakeSocketPolicy_merge<Base,Policy,sizeof(SocketPolicy_rv<n>)>                                           \
 121         {                                                                                                               \
 122             typedef SocketPolicy<                                                                                       \
 123                BOOST_PP_SEQ_FOR_EACH_I( SP_DeclareMakeSocketPolicy_merge_member, n, SENF_SOCKET_POLICIES )              \
 124                > type;                                                                                                  \
 125         };
 126
 127 #   include BOOST_PP_LOCAL_ITERATE()
 128
 129 #   undef SP_DeclareMakeSocketPolicy_merge_member
 130
 131     struct MakeSocketPolicy_fold
 132     {
 133         template <class Base, class Policy>
 134         struct apply
 135             : MakeSocketPolicy_merge<Base,
 136                                      Policy,
 137                                      sizeof(MakeSocketPolicy_merge_(static_cast<Policy*>(0)))>
 138         {};
 139
 140         template <class Base>
 141         struct apply<Base,nil>
 142         {
 143             typedef Base type;
 144         };
 145     };
 146
 147     template <class Base, class Vector>
 148     struct MakeSocketPolicy_impl
 149     {
 150         typedef typename boost::mpl::fold< Vector, Base, MakeSocketPolicy_fold >::type policy;
 151     };
 152
 153 #   define SP_DeclareArguments(x1,x2,n,SomePolicy)      \
 154         BOOST_PP_COMMA_IF( n )                          \
 155         typename Base::SomePolicy *
 156
 157     template <class Base>
 158     SocketPolicy_rv<1> SocketPolicy_checkcompat_(
 159         BOOST_PP_SEQ_FOR_EACH_I( SP_DeclareArguments, , SENF_SOCKET_POLICIES ) );
 160
 161 #   undef SP_DeclareArguments
 162
 163     template <class Base>
 164     SocketPolicy_rv<2> SocketPolicy_checkcompat_( ... );
 165
 166     template <int Size>
 167     struct SocketPolicy_checkcompat
 168         : public boost::false_type
 169     {};
 170
 171     template<>
 172     struct SocketPolicy_checkcompat<sizeof(SocketPolicy_rv<1>)>
 173         : public boost::true_type
 174     {};
 175
 176
 177 #   define SP_DeclareArguments(x1,x2,n,SomePolicy)      \
 178         BOOST_PP_COMMA_IF( n )                          \
 179         static_cast<typename Derived::SomePolicy *>(0)
 180
 181     template <class Base, class Derived>
 182     struct SocketPolicy_compatibility
 183         : public SocketPolicy_checkcompat< sizeof(
 184             SocketPolicy_checkcompat_<Base>(
 185                 BOOST_PP_SEQ_FOR_EACH_I( SP_DeclareArguments, , SENF_SOCKET_POLICIES ) )) >
 186     {};
 187
 188 } // namespace impl
 189
 190     template < BOOST_PP_ENUM_PARAMS_WITH_A_DEFAULT( SENF_SOCKET_POLICIES_N, class T, senf::impl::nil ) >
 191     class MakeSocketPolicy
 192         : public boost::mpl::if_< boost::is_convertible< T0*, SocketPolicyBase* >,
 193                                   impl::MakeSocketPolicy_impl< T0, boost::mpl::vector< BOOST_PP_ENUM_SHIFTED_PARAMS( SENF_SOCKET_POLICIES_N, T ) > >,
 194                                   impl::MakeSocketPolicy_impl< SocketPolicy<>,
 195                                                                boost::mpl::vector< BOOST_PP_ENUM_PARAMS( SENF_SOCKET_POLICIES_N, T ) > > >::type
 196     {};
 197
 198     template <class BasePolicy, class DerivedPolicy>
 199     struct SocketPolicyIsBaseOf
 200         : public boost::mpl::if_< boost::mpl::and_< boost::is_convertible< BasePolicy*, SocketPolicyBase* >,
 201                                                     boost::is_convertible< DerivedPolicy*, SocketPolicyBase* > >,
 202                                   impl::SocketPolicy_compatibility<BasePolicy,DerivedPolicy>,
 203                                   boost::false_type >::type
 204     {};
 205
 206 #   define SP_DefineConditions(x1,x2,SomePolicy)                                                \
 207         template <class Policy, class Trait>                                                    \
 208         struct BOOST_PP_CAT(SomePolicy,Is)                                                      \
 209             : public boost::is_convertible< typename Policy::SomePolicy*, Trait* >              \
 210         {};                                                                                     \
 211                                                                                                 \
 212         template <class Policy, class Trait>                                                    \
 213         struct BOOST_PP_CAT(BOOST_PP_CAT(If,SomePolicy),Is)                                     \
 214             : public boost::enable_if< BOOST_PP_CAT(SomePolicy,Is)<Policy,Trait> >              \
 215         {};                                                                                     \
 216                                                                                                 \
 217         template <class Policy, class Trait>                                                    \
 218         struct BOOST_PP_CAT(BOOST_PP_CAT(If,SomePolicy),IsNot)                                  \
 219             : public boost::enable_if_c< ! BOOST_PP_CAT(SomePolicy,Is)<Policy,Trait>::value >   \
 220         {};
 221
 222     BOOST_PP_SEQ_FOR_EACH( SP_DefineConditions, , SENF_SOCKET_POLICIES )
 223
 224 #   undef SP_DefineConditions
 225
 226 }
 227
 228 /// \endcond
 229
 230 ///////////////////////////////ih.e////////////////////////////////////////
 231 #endif
 232
 233 \f
 234 // Local Variables:
 235 // mode: c++
 236 // c-file-style: "senf"
 237 // End: