// Copyright Dean Michael Berris 2007.
// 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 __NETWORK_MESSAGE_WRAPPERS_HEADERS_HPP__
#define __NETWORK_MESSAGE_WRAPPERS_HEADERS_HPP__
namespace boost { namespace network {
// Forward declaration
template <class Message>
struct headers_range ;
/** headers wrapper for messages.
*
* This exposes an interface similar to a map, indexable
* using operator[] taking a string as the index and returns
* a range of iterators (std::pair<iterator, iterator>)
* whose keys are all equal to the index string.
*/
namespace impl {
template <class Tag>
struct headers_wrapper : public detail::wrapper_base<Tag> {
typedef Tag tag;
typedef basic_message<tag> message_type;
typedef typename headers_range<message_type>::type range_type;
explicit headers_wrapper(basic_message<tag> & message_)
: detail::wrapper_base<tag>(message_)
{ };
range_type operator[] (std::string const & key) const {
return _message.headers().equal_range(key);
};
typename message_type::headers_container_type::size_type count(std::string const & key) const {
return _message.headers().count(key);
};
};
}; // namespace impl
/// Factory method to create the right wrapper object
template <class Tag, template <class> class Message>
inline impl::headers_wrapper<Tag>
headers(Message<Tag> & message_) {
return impl::headers_wrapper<Tag>(message_);
};
/// Template metaprogram to get the range type for a message
template <class Message>
struct headers_range {
typedef typename
std::pair<
typename Message::headers_container_type::const_iterator,
typename Message::headers_container_type::const_iterator>
type;
};
}; // namespace network
}; // namespace boost
#endif // __NETWORK_MESSAGE_WRAPPERS_HEADERS_HPP__
