senf/Socket/SocketPolicy.ih

   1 // $Id$
   2 //
   3 // Copyright (C) 2006
   4 // Fraunhofer Institute for Open Communication Systems (FOKUS)
   5 // Competence Center NETwork research (NET), St. Augustin, GERMANY
   6 //     Stefan Bund <g0dil@berlios.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 /** \file
  24     \brief Policy Framework internal header
  25  */
  26
  27 #ifndef IH_SENF_Socket_SocketPolicy_
  28 #define IH_SENF_Socket_SocketPolicy_ 1
  29
  30 // Custom includes
  31 #include <boost/preprocessor/seq/for_each.hpp>
  32 #include <boost/preprocessor/seq/for_each_i.hpp>
  33 #include <boost/preprocessor/seq/size.hpp>
  34 #include <boost/preprocessor/seq/pop_front.hpp>
  35 #include <boost/preprocessor/punctuation/comma_if.hpp>
  36 #include <boost/preprocessor/repetition/enum_params.hpp>
  37 #include <boost/preprocessor/repetition/enum_params_with_a_default.hpp>
  38 #include <boost/preprocessor/repetition/enum_shifted_params.hpp>
  39 #include <boost/preprocessor/cat.hpp>
  40 #include <boost/preprocessor/seq/elem.hpp>
  41 #include <boost/preprocessor/arithmetic/dec.hpp>
  42 #include <boost/preprocessor/iteration/local.hpp>
  43 #include <boost/preprocessor/control/if.hpp>
  44 #include <boost/preprocessor/comparison/equal.hpp>
  45
  46 #include <boost/type_traits.hpp>
  47 #include <boost/mpl/vector.hpp>
  48 #include <boost/mpl/fold.hpp>
  49 #include <boost/mpl/if.hpp>
  50 #include <boost/mpl/and.hpp>
  51 #include <boost/utility.hpp> // for enable_if
  52
  53 #include <senf/Utils/mpl.hh>
  54 #include <senf/Utils/pool_alloc_mixin.hh>
  55
  56 ///////////////////////////////ih.p////////////////////////////////////////
  57
  58 /// \cond disabled
  59 // Hide this code from doxygen
  60
  61 namespace senf {
  62
  63 #   define SENF_SOCKET_POLICIES_N BOOST_PP_SEQ_SIZE( SENF_SOCKET_POLICIES )
  64
  65 #   define SP_DeclareAlias(x1,x2,SomePolicy)                                                      \
  66         typedef BOOST_PP_CAT(SomePolicy,Base) BOOST_PP_CAT(Unspecified,SomePolicy);
  67
  68     BOOST_PP_SEQ_FOR_EACH( SP_DeclareAlias, , SENF_SOCKET_POLICIES )
  69
  70 #   undef SP_DeclareAlias
  71
  72     struct SocketPolicyBase
  73     {
  74         virtual ~SocketPolicyBase();
  75
  76 #       define SP_Declare(x1,x2,SomePolicy)                                                       \
  77             virtual BOOST_PP_CAT(SomePolicy,Base) const & BOOST_PP_CAT(the,SomePolicy) ()         \
  78                 const = 0;
  79
  80         BOOST_PP_SEQ_FOR_EACH( SP_Declare, , SENF_SOCKET_POLICIES )
  81
  82 #       undef SP_Declare
  83     };
  84
  85 #   define SP_TemplateArgs(x1,x2,n,SomePolicy)                                                    \
  86         BOOST_PP_COMMA_IF( n )                                                                    \
  87         class BOOST_PP_CAT(SomePolicy,_) = BOOST_PP_CAT(SomePolicy,Base)
  88 #   define SP_TemplateParms(x1,x2,n,SomePolicy)                                                   \
  89         BOOST_PP_COMMA_IF( n ) BOOST_PP_CAT(SomePolicy,_)
  90
  91     template < BOOST_PP_SEQ_FOR_EACH_I( SP_TemplateArgs, , SENF_SOCKET_POLICIES ) >
  92     struct SocketPolicy
  93         : public SocketPolicyBase,
  94           public senf::pool_alloc_mixin<
  95               SocketPolicy< BOOST_PP_SEQ_FOR_EACH_I( SP_TemplateParms, , SENF_SOCKET_POLICIES ) > >
  96     {
  97 #   define SP_DeclarePolicyMember(x1,x2,SomePolicy)                                               \
  98         typedef BOOST_PP_CAT(SomePolicy,_) SomePolicy;                                            \
  99         SomePolicy BOOST_PP_CAT(BOOST_PP_CAT(the,SomePolicy),_);                                  \
 100         BOOST_PP_CAT(SomePolicy,Base) const & BOOST_PP_CAT(the,SomePolicy) () const               \
 101             { return BOOST_PP_CAT(BOOST_PP_CAT(the,SomePolicy),_); }
 102
 103         BOOST_PP_SEQ_FOR_EACH( SP_DeclarePolicyMember, , SENF_SOCKET_POLICIES )
 104 #   undef SP_DeclarePolicyMember
 105
 106         static void checkBaseOf(SocketPolicyBase const & other);
 107     };
 108
 109 #   undef SP_TemplateArgs
 110 #   undef SP_TemplateParms
 111
 112 namespace impl {
 113
 114     template <class Base, class Policy, int _>
 115     struct MakeSocketPolicy_merge
 116     {};
 117
 118 #   define SP_DeclareMakeSocketPolicy_merge_member(r,n,m,SomePolicy)                              \
 119         BOOST_PP_COMMA_IF( m )                                                                    \
 120         BOOST_PP_IIF( BOOST_PP_EQUAL(n,m), Policy, typename Base::SomePolicy )
 121
 122 #    define BOOST_PP_LOCAL_LIMITS (0, BOOST_PP_DEC( SENF_SOCKET_POLICIES_N ) )
 123 #    define BOOST_PP_LOCAL_MACRO(n)                                                               \
 124         senf::mpl::rv<n> MakeSocketPolicy_merge_(                                                 \
 125             BOOST_PP_CAT( BOOST_PP_SEQ_ELEM( n, SENF_SOCKET_POLICIES ),Base)*);                   \
 126                                                                                                   \
 127         template <class Base, class Policy>                                                       \
 128         struct MakeSocketPolicy_merge<Base,Policy,n>                                              \
 129         {                                                                                         \
 130             typedef SocketPolicy<                                                                 \
 131                BOOST_PP_SEQ_FOR_EACH_I( SP_DeclareMakeSocketPolicy_merge_member,                  \
 132                                         n,                                                        \
 133                                         SENF_SOCKET_POLICIES )                                    \
 134                > type;                                                                            \
 135         };
 136
 137 #   include BOOST_PP_LOCAL_ITERATE()
 138
 139 #   undef SP_DeclareMakeSocketPolicy_merge_member
 140
 141     struct MakeSocketPolicy_fold
 142     {
 143         template <class Base, class Policy>
 144         struct apply
 145             : MakeSocketPolicy_merge<Base,
 146                                      Policy,
 147                                      SENF_MPL_RV(MakeSocketPolicy_merge_(static_cast<Policy*>(0)))>
 148         {};
 149
 150         template <class Base>
 151         struct apply<Base,mpl::nil>
 152         {
 153             typedef Base type;
 154         };
 155     };
 156
 157     template <class Base, class Vector>
 158     struct MakeSocketPolicy_impl
 159     {
 160         typedef typename boost::mpl::fold< Vector, Base, MakeSocketPolicy_fold >::type policy;
 161     };
 162
 163 #   define SP_DeclareArguments(x1,x2,n,SomePolicy)                                                \
 164         BOOST_PP_COMMA_IF( n )                                                                    \
 165         typename Base::SomePolicy *
 166
 167     template <class Base>
 168     senf::mpl::rv<1> SocketPolicy_checkcompat_(
 169         BOOST_PP_SEQ_FOR_EACH_I( SP_DeclareArguments, , SENF_SOCKET_POLICIES ) );
 170
 171 #   undef SP_DeclareArguments
 172
 173     template <class Base>
 174     senf::mpl::rv<2> SocketPolicy_checkcompat_( ... );
 175
 176     template <int Size>
 177     struct SocketPolicy_checkcompat
 178         : public boost::false_type
 179     {};
 180
 181     template<>
 182     struct SocketPolicy_checkcompat<1>
 183         : public boost::true_type
 184     {};
 185
 186
 187 #   define SP_DeclareArguments(x1,x2,n,SomePolicy)                                                \
 188         BOOST_PP_COMMA_IF( n )                                                                    \
 189         static_cast<typename Derived::SomePolicy *>(0)
 190
 191     template <class Base, class Derived>
 192     struct SocketPolicy_compatibility
 193         : public SocketPolicy_checkcompat< SENF_MPL_RV(
 194             SocketPolicy_checkcompat_<Base>(
 195                 BOOST_PP_SEQ_FOR_EACH_I( SP_DeclareArguments, , SENF_SOCKET_POLICIES ) )) >
 196     {};
 197
 198 } // namespace impl
 199
 200     template < BOOST_PP_ENUM_PARAMS_WITH_A_DEFAULT( SENF_SOCKET_POLICIES_N,
 201                                                     class T,
 202                                                     mpl::nil ) >
 203     class MakeSocketPolicy
 204         : public boost::mpl::if_< boost::is_convertible< T0*, SocketPolicyBase* >,
 205                                   impl::MakeSocketPolicy_impl<
 206                                       T0,
 207                                       boost::mpl::vector<
 208                                           BOOST_PP_ENUM_SHIFTED_PARAMS(
 209                                               SENF_SOCKET_POLICIES_N, T ) > >,
 210                                   impl::MakeSocketPolicy_impl<
 211                                       SocketPolicy<>,
 212                                       boost::mpl::vector<
 213                                           BOOST_PP_ENUM_PARAMS(
 214                                               SENF_SOCKET_POLICIES_N, T ) > > >::type
 215     {};
 216
 217     template <class BasePolicy, class DerivedPolicy>
 218     struct SocketPolicyIsBaseOf
 219         : public boost::mpl::if_<
 220               boost::mpl::and_< boost::is_convertible< BasePolicy*, SocketPolicyBase* >,
 221                                 boost::is_convertible< DerivedPolicy*, SocketPolicyBase* > >,
 222               impl::SocketPolicy_compatibility<BasePolicy,DerivedPolicy>,
 223               boost::false_type
 224           >::type
 225     {};
 226
 227 #   define SP_DefineConditions(x1,x2,SomePolicy)                                                  \
 228         template <class Policy, class Trait>                                                      \
 229         struct BOOST_PP_CAT(SomePolicy,Is)                                                        \
 230             : public boost::is_convertible< typename Policy::SomePolicy*, Trait* >                \
 231         {};                                                                                       \
 232                                                                                                   \
 233         template <class Policy, class Trait>                                                      \
 234         struct BOOST_PP_CAT(BOOST_PP_CAT(If,SomePolicy),Is)                                       \
 235             : public boost::enable_if< BOOST_PP_CAT(SomePolicy,Is)<Policy,Trait> >                \
 236         {};                                                                                       \
 237                                                                                                   \
 238         template <class Policy, class Trait>                                                      \
 239         struct BOOST_PP_CAT(BOOST_PP_CAT(If,SomePolicy),IsNot)                                    \
 240             : public boost::enable_if_c< ! BOOST_PP_CAT(SomePolicy,Is)<Policy,Trait>::value >     \
 241         {};
 242
 243     BOOST_PP_SEQ_FOR_EACH( SP_DefineConditions, , SENF_SOCKET_POLICIES )
 244
 245 #   undef SP_DefineConditions
 246
 247 }
 248
 249 /// \endcond
 250
 251 ///////////////////////////////ih.e////////////////////////////////////////
 252 #endif
 253
 254 \f
 255 // Local Variables:
 256 // mode: c++
 257 // fill-column: 100
 258 // c-file-style: "senf"
 259 // indent-tabs-mode: nil
 260 // ispell-local-dictionary: "american"
 261 // compile-command: "scons -u test"
 262 // comment-column: 40
 263 // End: