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+/*
+ * Copyright (c) 2015, Peter Thorson. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * * Neither the name of the WebSocket++ Project nor the
+ * names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL PETER THORSON BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef WEBSOCKETPP_COMMON_ASIO_HPP
+#define WEBSOCKETPP_COMMON_ASIO_HPP
+
+// This file goes to some length to preserve compatibility with versions of
+// boost older than 1.49 (where the first modern steady_timer timer based on
+// boost/std chrono was introduced.
+//
+// For the versions older than 1.49, the deadline_timer is used instead. this
+// brings in dependencies on boost date_time and it has a different interface
+// that is normalized by the `lib::asio::is_neg` and `lib::asio::milliseconds`
+// wrappers provided by this file.
+//
+// The primary reason for this continued support is that boost 1.48 is the
+// default and not easily changeable version of boost supplied by the package
+// manager of popular Linux distributions like Ubuntu 12.04 LTS. Once the need
+// for this has passed this should be cleaned up and simplified.
+
+#ifdef ASIO_STANDALONE
+ #include <asio/version.hpp>
+
+ #if (ASIO_VERSION/100000) == 1 && ((ASIO_VERSION/100)%1000) < 8
+ static_assert(false, "The minimum version of standalone Asio is 1.8.0");
+ #endif
+
+ #include <asio.hpp>
+ #include <asio/steady_timer.hpp>
+ #include <websocketpp/common/chrono.hpp>
+#else
+ #include <boost/version.hpp>
+
+ // See note above about boost <1.49 compatibility. If we are running on
+ // boost > 1.48 pull in the steady timer and chrono library
+ #if (BOOST_VERSION/100000) == 1 && ((BOOST_VERSION/100)%1000) > 48
+ #include <boost/asio/steady_timer.hpp>
+ #include <websocketpp/common/chrono.hpp>
+ #endif
+
+ #include <boost/asio.hpp>
+ #include <boost/system/error_code.hpp>
+#endif
+
+namespace websocketpp {
+namespace lib {
+
+#ifdef ASIO_STANDALONE
+ namespace asio {
+ using namespace ::asio;
+ // Here we assume that we will be using std::error_code with standalone
+ // Asio. This is probably a good assumption, but it is possible in rare
+ // cases that local Asio versions would be used.
+ using std::errc;
+
+ // See note above about boost <1.49 compatibility. Because we require
+ // a standalone Asio version of 1.8+ we are guaranteed to have
+ // steady_timer available. By convention we require the chrono library
+ // (either boost or std) for use with standalone Asio.
+ template <typename T>
+ bool is_neg(T duration) {
+ return duration.count() < 0;
+ }
+ inline lib::chrono::milliseconds milliseconds(long duration) {
+ return lib::chrono::milliseconds(duration);
+ }
+ } // namespace asio
+
+#else
+ namespace asio {
+ using namespace boost::asio;
+
+ // See note above about boost <1.49 compatibility
+ #if (BOOST_VERSION/100000) == 1 && ((BOOST_VERSION/100)%1000) > 48
+ // Using boost::asio >=1.49 so we use chrono and steady_timer
+ template <typename T>
+ bool is_neg(T duration) {
+ return duration.count() < 0;
+ }
+ inline lib::chrono::milliseconds milliseconds(long duration) {
+ return lib::chrono::milliseconds(duration);
+ }
+ #else
+ // Using boost::asio <1.49 we pretend a deadline timer is a steady
+ // timer and wrap the negative detection and duration conversion
+ // appropriately.
+ typedef boost::asio::deadline_timer steady_timer;
+
+ template <typename T>
+ bool is_neg(T duration) {
+ return duration.is_negative();
+ }
+ inline boost::posix_time::time_duration milliseconds(long duration) {
+ return boost::posix_time::milliseconds(duration);
+ }
+ #endif
+
+ using boost::system::error_code;
+ namespace errc = boost::system::errc;
+ } // namespace asio
+#endif
+
+
+} // namespace lib
+} // namespace websocketpp
+
+#endif // WEBSOCKETPP_COMMON_ASIO_HPP