/usr/include/websocketpp/common/asio.hpp is in libwebsocketpp-dev 0.7.0-11.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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
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