#include <boost/asio/detail/config.hpp>
#include <boost/asio/detail/strand_executor_service.hpp>
#include <boost/asio/detail/type_traits.hpp>
+#include <boost/asio/execution/executor.hpp>
+#include <boost/asio/is_executor.hpp>
#include <boost/asio/detail/push_options.hpp>
*/
strand()
: executor_(),
- impl_(use_service<detail::strand_executor_service>(
- executor_.context()).create_implementation())
+ impl_(strand::create_implementation(executor_))
{
}
/// Construct a strand for the specified executor.
- explicit strand(const Executor& e)
+ template <typename Executor1>
+ explicit strand(const Executor1& e,
+ typename enable_if<
+ conditional<
+ !is_same<Executor1, strand>::value,
+ is_convertible<Executor1, Executor>,
+ false_type
+ >::type::value
+ >::type* = 0)
: executor_(e),
- impl_(use_service<detail::strand_executor_service>(
- executor_.context()).create_implementation())
+ impl_(strand::create_implementation(executor_))
{
}
#endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
/// Destructor.
- ~strand()
+ ~strand() BOOST_ASIO_NOEXCEPT
{
}
return executor_;
}
+ /// Forward a query to the underlying executor.
+ /**
+ * Do not call this function directly. It is intended for use with the
+ * execution::execute customisation point.
+ *
+ * For example:
+ * @code boost::asio::strand<my_executor_type> ex = ...;
+ * if (boost::asio::query(ex, boost::asio::execution::blocking)
+ * == boost::asio::execution::blocking.never)
+ * ... @endcode
+ */
+ template <typename Property>
+ typename enable_if<
+ can_query<const Executor&, Property>::value,
+ typename query_result<const Executor&, Property>::type
+ >::type query(const Property& p) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ is_nothrow_query<const Executor&, Property>::value))
+ {
+ return boost::asio::query(executor_, p);
+ }
+
+ /// Forward a requirement to the underlying executor.
+ /**
+ * Do not call this function directly. It is intended for use with the
+ * boost::asio::require customisation point.
+ *
+ * For example:
+ * @code boost::asio::strand<my_executor_type> ex1 = ...;
+ * auto ex2 = boost::asio::require(ex1,
+ * boost::asio::execution::blocking.never); @endcode
+ */
+ template <typename Property>
+ typename enable_if<
+ can_require<const Executor&, Property>::value,
+ strand<typename decay<
+ typename require_result<const Executor&, Property>::type
+ >::type>
+ >::type require(const Property& p) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ is_nothrow_require<const Executor&, Property>::value))
+ {
+ return strand<typename decay<
+ typename require_result<const Executor&, Property>::type
+ >::type>(boost::asio::require(executor_, p), impl_);
+ }
+
+ /// Forward a preference to the underlying executor.
+ /**
+ * Do not call this function directly. It is intended for use with the
+ * boost::asio::prefer customisation point.
+ *
+ * For example:
+ * @code boost::asio::strand<my_executor_type> ex1 = ...;
+ * auto ex2 = boost::asio::prefer(ex1,
+ * boost::asio::execution::blocking.never); @endcode
+ */
+ template <typename Property>
+ typename enable_if<
+ can_prefer<const Executor&, Property>::value,
+ strand<typename decay<
+ typename prefer_result<const Executor&, Property>::type
+ >::type>
+ >::type prefer(const Property& p) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ is_nothrow_prefer<const Executor&, Property>::value))
+ {
+ return strand<typename decay<
+ typename prefer_result<const Executor&, Property>::type
+ >::type>(boost::asio::prefer(executor_, p), impl_);
+ }
+
+#if !defined(BOOST_ASIO_NO_TS_EXECUTORS)
/// Obtain the underlying execution context.
execution_context& context() const BOOST_ASIO_NOEXCEPT
{
{
executor_.on_work_finished();
}
+#endif // !defined(BOOST_ASIO_NO_TS_EXECUTORS)
+
+ /// Request the strand to invoke the given function object.
+ /**
+ * Do not call this function directly. It is intended for use with the
+ * execution::execute customisation point.
+ *
+ * For example:
+ * @code boost::asio::strand<my_executor_type> ex = ...;
+ * execution::execute(ex, my_function_object); @endcode
+ *
+ * This function is used to ask the strand to execute the given function
+ * object on its underlying executor. The function object will be executed
+ * according to the properties of the underlying executor.
+ *
+ * @param f The function object to be called. The executor will make
+ * a copy of the handler object as required. The function signature of the
+ * function object must be: @code void function(); @endcode
+ */
+ template <typename Function>
+ typename enable_if<
+ execution::can_execute<const Executor&, Function>::value
+ >::type execute(BOOST_ASIO_MOVE_ARG(Function) f) const
+ {
+ detail::strand_executor_service::execute(impl_,
+ executor_, BOOST_ASIO_MOVE_CAST(Function)(f));
+ }
+#if !defined(BOOST_ASIO_NO_TS_EXECUTORS)
/// Request the strand to invoke the given function object.
/**
* This function is used to ask the strand to execute the given function
detail::strand_executor_service::defer(impl_,
executor_, BOOST_ASIO_MOVE_CAST(Function)(f), a);
}
+#endif // !defined(BOOST_ASIO_NO_TS_EXECUTORS)
/// Determine whether the strand is running in the current thread.
/**
#if defined(GENERATING_DOCUMENTATION)
private:
#endif // defined(GENERATING_DOCUMENTATION)
- Executor executor_;
typedef detail::strand_executor_service::implementation_type
implementation_type;
+
+ template <typename InnerExecutor>
+ static implementation_type create_implementation(const InnerExecutor& ex,
+ typename enable_if<
+ can_query<InnerExecutor, execution::context_t>::value
+ >::type* = 0)
+ {
+ return use_service<detail::strand_executor_service>(
+ boost::asio::query(ex, execution::context)).create_implementation();
+ }
+
+ template <typename InnerExecutor>
+ static implementation_type create_implementation(const InnerExecutor& ex,
+ typename enable_if<
+ !can_query<InnerExecutor, execution::context_t>::value
+ >::type* = 0)
+ {
+ return use_service<detail::strand_executor_service>(
+ ex.context()).create_implementation();
+ }
+
+ strand(const Executor& ex, const implementation_type& impl)
+ : executor_(ex),
+ impl_(impl)
+ {
+ }
+
+ Executor executor_;
implementation_type impl_;
};
/// Create a @ref strand object for an executor.
template <typename Executor>
inline strand<Executor> make_strand(const Executor& ex,
- typename enable_if<is_executor<Executor>::value>::type* = 0)
+ typename enable_if<
+ is_executor<Executor>::value || execution::is_executor<Executor>::value
+ >::type* = 0)
{
return strand<Executor>(ex);
}
inline strand<typename ExecutionContext::executor_type>
make_strand(ExecutionContext& ctx,
typename enable_if<
- is_convertible<ExecutionContext&, execution_context&>::value>::type* = 0)
+ is_convertible<ExecutionContext&, execution_context&>::value
+ >::type* = 0)
{
return strand<typename ExecutionContext::executor_type>(ctx.get_executor());
}
/*@}*/
+#if !defined(GENERATING_DOCUMENTATION)
+
+namespace traits {
+
+#if !defined(BOOST_ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT)
+
+template <typename Executor>
+struct equality_comparable<strand<Executor> >
+{
+ BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
+ BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
+};
+
+#endif // !defined(BOOST_ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT)
+
+#if !defined(BOOST_ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT)
+
+template <typename Executor, typename Function>
+struct execute_member<strand<Executor>, Function,
+ typename enable_if<
+ execution::can_execute<const Executor&, Function>::value
+ >::type>
+{
+ BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
+ BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false);
+ typedef void result_type;
+};
+
+#endif // !defined(BOOST_ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT)
+
+#if !defined(BOOST_ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
+
+template <typename Executor, typename Property>
+struct query_member<strand<Executor>, Property,
+ typename enable_if<
+ can_query<const Executor&, Property>::value
+ >::type>
+{
+ BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
+ BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept =
+ (is_nothrow_query<Executor, Property>::value));
+ typedef typename query_result<Executor, Property>::type result_type;
+};
+
+#endif // !defined(BOOST_ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
+
+#if !defined(BOOST_ASIO_HAS_DEDUCED_REQUIRE_MEMBER_TRAIT)
+
+template <typename Executor, typename Property>
+struct require_member<strand<Executor>, Property,
+ typename enable_if<
+ can_require<const Executor&, Property>::value
+ >::type>
+{
+ BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
+ BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept =
+ (is_nothrow_require<Executor, Property>::value));
+ typedef strand<typename decay<
+ typename require_result<Executor, Property>::type
+ >::type> result_type;
+};
+
+#endif // !defined(BOOST_ASIO_HAS_DEDUCED_REQUIRE_MEMBER_TRAIT)
+
+#if !defined(BOOST_ASIO_HAS_DEDUCED_PREFER_MEMBER_TRAIT)
+
+template <typename Executor, typename Property>
+struct prefer_member<strand<Executor>, Property,
+ typename enable_if<
+ can_prefer<const Executor&, Property>::value
+ >::type>
+{
+ BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
+ BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept =
+ (is_nothrow_prefer<Executor, Property>::value));
+ typedef strand<typename decay<
+ typename prefer_result<Executor, Property>::type
+ >::type> result_type;
+};
+
+#endif // !defined(BOOST_ASIO_HAS_DEDUCED_PREFER_MEMBER_TRAIT)
+
+} // namespace traits
+
+#endif // !defined(GENERATING_DOCUMENTATION)
+
} // namespace asio
} // namespace boost
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