/usr/include/asio/detail/handler_base_from_member.hpp is in libasio-dev 1.4.1-3ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// handler_base_from_member.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_BASE_FROM_MEMBER_HPP
#define ASIO_DETAIL_HANDLER_BASE_FROM_MEMBER_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/handler_alloc_helpers.hpp"
#include "asio/detail/handler_invoke_helpers.hpp"
namespace asio {
namespace detail {
// Base class for classes that need a handler data member. Forwards the custom
// allocation and invocation hooks to the contained handler.
template <typename Handler>
class handler_base_from_member
{
public:
handler_base_from_member(Handler handler)
: handler_(handler)
{
}
//protected:
Handler handler_;
protected:
// Protected destructor to prevent deletion through this type.
~handler_base_from_member()
{
}
};
template <typename Handler>
inline void* asio_handler_allocate(std::size_t size,
handler_base_from_member<Handler>* this_handler)
{
return asio_handler_alloc_helpers::allocate(
size, &this_handler->handler_);
}
template <typename Handler>
inline void asio_handler_deallocate(void* pointer, std::size_t size,
handler_base_from_member<Handler>* this_handler)
{
asio_handler_alloc_helpers::deallocate(
pointer, size, &this_handler->handler_);
}
template <typename Function, typename Handler>
inline void asio_handler_invoke(const Function& function,
handler_base_from_member<Handler>* this_handler)
{
asio_handler_invoke_helpers::invoke(
function, &this_handler->handler_);
}
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_DETAIL_HANDLER_BASE_FROM_MEMBER_HPP
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