/usr/include/asio/detail/handler_invoke_helpers.hpp is in libasio-dev 1.4.1-3ubuntu2.
This file is owned by root:root, with mode 0o644.
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// handler_invoke_helpers.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef ASIO_DETAIL_HANDLER_INVOKE_HELPERS_HPP
#define ASIO_DETAIL_HANDLER_INVOKE_HELPERS_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/push_options.hpp"
#include "asio/detail/push_options.hpp"
#include <boost/detail/workaround.hpp>
#include "asio/detail/pop_options.hpp"
#include "asio/handler_invoke_hook.hpp"
// Calls to asio_handler_invoke must be made from a namespace that does not
// contain overloads of this function. The asio_handler_invoke_helpers
// namespace is defined here for that purpose.
namespace asio_handler_invoke_helpers {
template <typename Function, typename Context>
inline void invoke(const Function& function, Context* context)
{
#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
Function tmp(function);
tmp();
#else
using namespace asio;
asio_handler_invoke(function, context);
#endif
}
} // namespace asio_handler_invoke_helpers
#include "asio/detail/pop_options.hpp"
#endif // ASIO_DETAIL_HANDLER_INVOKE_HELPERS_HPP
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