src/beacons/detail/in_queue_invoke.hpp

   1 /**
   2  * beacon
   3  * Author: Lukas Krejci <krejci.l@centrum.cz>, (C) 2008
   4  * Copyright: See COPYING file that comes with this distribution
   5  */
   6
   7 #ifndef BOOST_PP_IS_ITERATING
   8
   9 #ifndef BEACONS_in_queue_invoke_new_H
  10 #define BEACONS_in_queue_invoke_new_H
  11
  12 #include <beacons/config.hpp>
  13 #include <beacons/invokable.hpp>
  14 #include <beacons/future_event.hpp>
  15 #include <beacons/detail/future_event_base.hpp>
  16 #include <beacons/reference_countable.hpp>
  17
  18 #include <boost/type_traits/function_traits.hpp>
  19 #include <boost/type_traits/add_pointer.hpp>
  20
  21 //include the preprocessor magic
  22 #include <boost/preprocessor/iteration/iterate.hpp>
  23 #include <boost/preprocessor/repetition.hpp>
  24 #include <boost/preprocessor/punctuation/comma_if.hpp>
  25 #include <boost/preprocessor/cat.hpp>
  26
  27 #define BOOST_PP_ITERATION_LIMITS (0, BEACONS_MAX_ARGS)
  28 #define BOOST_PP_FILENAME_1 "beacons/detail/in_queue_invoke.hpp" // this file
  29
  30 namespace beacons {
  31
  32 //forward decl
  33 class event_queue;
  34
  35 namespace detail {
  36
  37 /**
  38  * Generic base class for the numerous specializations of the in_queue_invoke
  39  * class for various template parameters.
  40  */
  41 class in_queue_invoke_base {
  42     protected:
  43
  44         typedef intrusive_ptr<future_event_base> future_ptr;
  45
  46         in_queue_invoke_base(future_ptr future) : _future(future) {}
  47
  48         void set_result(void * result) {
  49             _future->set(result);
  50         }
  51
  52     private:
  53         future_ptr _future;
  54 };
  55
  56 //template classes to support different flavours of function
  57 //objects invokable in the event_queue.
  58
  59 template<typename Function, typename Signature>
  60 class in_queue_invoke;
  61
  62 template<typename Function, typename Signature>
  63 class in_queue_invoke_no_future;
  64
  65 template<typename Function, typename Signature>
  66 class in_queue_wrapper_future_pointer;
  67
  68 template<typename Function, typename Signature>
  69 class in_queue_wrapper_no_future;
  70
  71 #include BOOST_PP_ITERATE()
  72
  73 } //namespace detail
  74
  75 } //namespace beacons
  76
  77 #endif //BEACONS_in_queue_invoke_new_H
  78
  79 #else // BOOST_PP_IS_ITERATING
  80
  81 #define n BOOST_PP_ITERATION()
  82
  83 #define CONSTRUCTOR_ARG_INIT(z, n, unused) \
  84     BOOST_PP_CAT(_arg, n)(BOOST_PP_CAT(arg, n))
  85
  86 #define MEMBER_VAR_DEF(z, n, unused) \
  87     BOOST_PP_CAT(T, n) BOOST_PP_CAT(_arg, n);
  88
  89 template<typename Function,
  90          typename R
  91          BOOST_PP_COMMA_IF(n)
  92          BOOST_PP_ENUM_PARAMS(n, typename T)>
  93 class in_queue_invoke<Function, R (*)(BOOST_PP_ENUM_PARAMS(n, T))> :
  94     public beacons::invokable, public in_queue_invoke_base {
  95
  96     public:
  97
  98         explicit in_queue_invoke(
  99             BOOST_PP_ENUM_BINARY_PARAMS(n, T, arg)
 100             BOOST_PP_COMMA_IF(n)
 101             Function const * f,
 102             intrusive_ptr<future_event_base> future,
 103             invokable::token_ptr token)
 104             :
 105             invokable(token),
 106             in_queue_invoke_base(future),
 107             _f(f)
 108             BOOST_PP_COMMA_IF(n)
 109             BOOST_PP_ENUM(n, CONSTRUCTOR_ARG_INIT, ~) {}
 110
 111         void invoke() {
 112             R result = (*_f)(BOOST_PP_ENUM_PARAMS(n, _arg));
 113             set_result(static_cast<void *>(&result));
 114         }
 115
 116     private:
 117         Function const * _f;
 118         BOOST_PP_REPEAT(n, MEMBER_VAR_DEF, ~)
 119 };
 120
 121 template<typename Function
 122          BOOST_PP_COMMA_IF(n)
 123          BOOST_PP_ENUM_PARAMS(n, typename T)>
 124 class in_queue_invoke<Function, void (*)(BOOST_PP_ENUM_PARAMS(n, T))> :
 125     public beacons::invokable, public in_queue_invoke_base {
 126
 127     public:
 128
 129         explicit in_queue_invoke(
 130             BOOST_PP_ENUM_BINARY_PARAMS(n, T, arg)
 131             BOOST_PP_COMMA_IF(n)
 132             Function const * f,
 133             intrusive_ptr<future_event_base> future,
 134             invokable::token_ptr token)
 135             :
 136             invokable(token),
 137             in_queue_invoke_base(future),
 138             _f(f)
 139             BOOST_PP_COMMA_IF(n)
 140             BOOST_PP_ENUM(n, CONSTRUCTOR_ARG_INIT, arg) {}
 141
 142         void invoke() {
 143             (*_f)(BOOST_PP_ENUM_PARAMS(n, _arg));
 144             void * res = 0;
 145             set_result(res);
 146         }
 147
 148     private:
 149         Function const * _f;
 150         BOOST_PP_REPEAT(n, MEMBER_VAR_DEF, ~)
 151 };
 152
 153 template<typename Function,
 154          typename R
 155          BOOST_PP_COMMA_IF(n)
 156          BOOST_PP_ENUM_PARAMS(n, typename T)>
 157 class in_queue_invoke_no_future<Function, R (*)(BOOST_PP_ENUM_PARAMS(n, T))> :
 158     public beacons::invokable {
 159
 160     public:
 161         explicit in_queue_invoke_no_future(
 162             BOOST_PP_ENUM_BINARY_PARAMS(n, T, arg)
 163             BOOST_PP_COMMA_IF(n)
 164             Function const * f,
 165             invokable::token_ptr token)
 166             :
 167             invokable(token),
 168             _f(f)
 169             BOOST_PP_COMMA_IF(n)
 170             BOOST_PP_ENUM(n, CONSTRUCTOR_ARG_INIT, arg) {}
 171
 172         void invoke() {
 173             (*_f)(BOOST_PP_ENUM_PARAMS(n, _arg));
 174         }
 175
 176     private:
 177         Function const * _f;
 178         BOOST_PP_REPEAT(n, MEMBER_VAR_DEF, ~)
 179
 180 };
 181
 182 template<typename Function,
 183          typename R
 184          BOOST_PP_COMMA_IF(n)
 185          BOOST_PP_ENUM_PARAMS(n, typename T)>
 186 class in_queue_wrapper_future_pointer<Function, R (*)(BOOST_PP_ENUM_PARAMS(n, T))> {
 187
 188     typedef R (* Signature)(BOOST_PP_ENUM_PARAMS(n, T));
 189     typedef intrusive_ptr<future<R> > result_type;
 190     public:
 191
 192         explicit in_queue_wrapper_future_pointer(event_queue & queue, Function const * f, invokable::token_ptr token) :
 193             _queue(queue), _f(f), _token(token) {}
 194
 195         result_type operator()(BOOST_PP_ENUM_BINARY_PARAMS(n, T, arg)) {
 196             intrusive_ptr<future_event_base> fut(new future_event<R>);
 197
 198             this->_queue.enqueue(new in_queue_invoke<Function, Signature>(
 199                 BOOST_PP_ENUM_PARAMS(n, arg)
 200                 BOOST_PP_COMMA_IF(n)
 201                 _f, fut, _token));
 202
 203             return result_type(reinterpret_cast<future_event<R> *>(fut.get()));
 204         }
 205
 206     private:
 207         event_queue & _queue;
 208         Function const * _f;
 209         invokable::token_ptr _token;
 210 };
 211
 212 template<typename Function,
 213          typename R
 214          BOOST_PP_COMMA_IF(n)
 215          BOOST_PP_ENUM_PARAMS(n, typename T)>
 216 class in_queue_wrapper_no_future<Function, R (*)(BOOST_PP_ENUM_PARAMS(n, T))> {
 217
 218     typedef R (* Signature)(BOOST_PP_ENUM_PARAMS(n, T));
 219     public:
 220
 221         explicit in_queue_wrapper_no_future(event_queue & queue, Function const * f, invokable::token_ptr token) :
 222             _queue(queue), _f(f), _token(token) {}
 223
 224         void operator()(BOOST_PP_ENUM_BINARY_PARAMS(n, T, arg)) {
 225             this->_queue.enqueue(
 226                 new in_queue_invoke_no_future<Function, Signature>(
 227                     BOOST_PP_ENUM_PARAMS(n, arg)
 228                     BOOST_PP_COMMA_IF(n)
 229                     _f, _token));
 230         }
 231
 232     private:
 233         event_queue & _queue;
 234         Function const * _f;
 235         invokable::token_ptr _token;
 236 };
 237
 238 #undef n
 239 #undef CONSTRUCTOR_ARG_INIT
 240 #undef MEMBER_VAR_DEF
 241
 242 #endif //BOOST_PP_IS_ITERATING