HTML Diff buffers/reference

src/examples/cpp03/buffers/reference_counted.cpp		src/examples/cpp11/buffers/reference_counted.cpp
⋮		⋮
1	//	1	//
2	//·reference_counted.cpp	2	//·reference_counted.cpp
3	//·~~~~~~~~~~~~~~~~~~~~~	3	//·~~~~~~~~~~~~~~~~~~~~~
4	//	4	//
5	//·Copyright·(c)·2003-2021·Christopher·M.·Kohlhoff·(chris·at·kohlhoff·dot·com)	5	//·Copyright·(c)·2003-2021·Christopher·M.·Kohlhoff·(chris·at·kohlhoff·dot·com)
6	//	6	//
7	//·Distributed·under·the·Boost·Software·License,·Version·1.0.·(See·accompanying	7	//·Distributed·under·the·Boost·Software·License,·Version·1.0.·(See·accompanying
8	//·file·LICENSE_1_0.txt·or·copy·at·http://www.boost.org/LICENSE_1_0.txt)	8	//·file·LICENSE_1_0.txt·or·copy·at·http://www.boost.org/LICENSE_1_0.txt)
9	//	9	//
10		10
11	#include·<asio.hpp>	11	#include·<asio.hpp>
12	#include·<boost/bind/bind.hpp>
13	#include·<boost/enable_shared_from_this.hpp>
14	#include·<boost/shared_ptr.hpp>
15	#include·<iostream>	12	#include·<iostream>
		13	#include·<memory>
		14	#include·<utility>
16	#include·<vector>	15	#include·<vector>
		16	#include·<ctime>
17		17
18	using·asio::ip::tcp;	18	using·asio::ip::tcp;
19		19
20	//·A·reference-counted·non-modifiable·buffer·class.	20	//·A·reference-counted·non-modifiable·buffer·class.
21	class·shared_const_buffer	21	class·shared_const_buffer
22	{	22	{
23	public:	23	public:
24	··//·Construct·from·a·std::string.	24	··//·Construct·from·a·std::string.
25	··explicit·shared_const_buffer(const·std::string&·data)	25	··explicit·shared_const_buffer(const·std::string&·data)
26	····:·data_(new·std::vector<char>(data.begin(),·data.end())),	26	····:·data_(new·std::vector<char>(data.begin(),·data.end())),
27	······buffer_(asio::buffer(*data_))	27	······buffer_(asio::buffer(*data_))
28	··{	28	··{
29	··}	29	··}
30		30
31	··//·Implement·the·ConstBufferSequence·requirements.	31	··//·Implement·the·ConstBufferSequence·requirements.
32	··typedef·asio::const_buffer·value_type;	32	··typedef·asio::const_buffer·value_type;
33	··typedef·const·asio::const_buffer*·const_iterator;	33	··typedef·const·asio::const_buffer*·const_iterator;
34	··const·asio::const_buffer*·begin()·const·{·return·&buffer_;·}	34	··const·asio::const_buffer*·begin()·const·{·return·&buffer_;·}
35	··const·asio::const_buffer*·end()·const·{·return·&buffer_·+·1;·}	35	··const·asio::const_buffer*·end()·const·{·return·&buffer_·+·1;·}
36		36
37	private:	37	private:
38	··boost::shared_ptr<std::vector<char>·>·data_;	38	··std::shared_ptr<std::vector<char>·>·data_;
39	··asio::const_buffer·buffer_;	39	··asio::const_buffer·buffer_;
40	};	40	};
41		41
42	class·session	42	class·session
43	··:·public·boost::enable_shared_from_this<session>	43	··:·public·std::enable_shared_from_this<session>
44	{	44	{
45	public:	45	public:
46	··session(asio::io_context&·io_context)	46	··session(tcp::socket·socket)
47	····:·socket_(io_context)	47	····:·socket_(std::move(socket))
48	··{	48	··{
49	··}	49	··}
50		50
51	··tcp::socket&·socket()
52	··{
53	····return·socket_;
54	··}
55
56	··void·start()	51	··void·start()
57	··{	52	··{
58	····using·namespace·std;·//·For·time_t,·time·and·ctime.	53	····do_write();
59	····time_t·now·=·time(0);
60	····shared_const_buffer·buffer(ctime(&now));
61	····asio::async_write(socket_,·buffer,
62	········boost::bind(&session::handle_write,·shared_from_this()));
63	··}	54	··}
64		55
65	··void·handle_write()	56	private:
		57	··void·do_write()
66	··{	58	··{
		59	····std::time_t·now·=·std::time(0);
		60	····shared_const_buffer·buffer(std::ctime(&now));
		61
		62	····auto·self(shared_from_this());
		63	····asio::async_write(socket_,·buffer,
		64	········[self](std::error_code·/ec/,·std::size_t·/length/)
		65	········{
		66	········});
67	··}	67	··}
68		68
69	private:
70	··//·The·socket·used·to·communicate·with·the·client.	69	··//·The·socket·used·to·communicate·with·the·client.
71	··tcp::socket·socket_;	70	··tcp::socket·socket_;
72	};	71	};
73		72
74	typedef·boost::shared_ptr<session>·session_ptr;
75
76	class·server	73	class·server
77	{	74	{
78	public:	75	public:
79	··server(asio::io_context&·io_context,·short·port)	76	··server(asio::io_context&·io_context,·short·port)
80	····:·io_context_(io_context),	77	····:·acceptor_(io_context,·tcp::endpoint(tcp::v4(),·port))
81	······acceptor_(io_context,·tcp::endpoint(tcp::v4(),·port))
82	··{	78	··{
83	····session_ptr·new_session(new·session(io_context_));	79	····do_accept();
84	····acceptor_.async_accept(new_session->socket(),
85	········boost::bind(&server::handle_accept,·this,·new_session,
86	··········asio::placeholders::error));
87	··}	80	··}
88		81
89	··void·handle_accept(session_ptr·new_session,	82	private:
90	······const·asio::error_code&·error)	83	··void·do_accept()
91	··{	84	··{
92	····if·(!error)	85	····acceptor_.async_accept(
93	····{	86	········[this](std::error_code·ec,·tcp::socket·socket)
94	······new_session->start();	87	········{
95	····}	88	··········if·(!ec)
		89	··········{
		90	············std::make_shared<session>(std::move(socket))->start();
		91	··········}
96		92
97	····new_session.reset(new·session(io_context_));	93	··········do_accept();
98	····acceptor_.async_accept(new_session->socket(),	94	········});
99	········boost::bind(&server::handle_accept,·this,·new_session,
100	··········asio::placeholders::error));
101	··}	95	··}
102		96
103	private:
104	··asio::io_context&·io_context_;
105	··tcp::acceptor·acceptor_;	97	··tcp::acceptor·acceptor_;
106	};	98	};
107		99
108	int·main(int·argc,·char*·argv[])	100	int·main(int·argc,·char*·argv[])
109	{	101	{
110	··try	102	··try
111	··{	103	··{
112	····if·(argc·!=·2)	104	····if·(argc·!=·2)
113	····{	105	····{
114	······std::cerr·<<·"Usage:·reference_counted·<port>\n";	106	······std::cerr·<<·"Usage:·reference_counted·<port>\n";
115	······return·1;	107	······return·1;
116	····}	108	····}
117		109
118	····asio::io_context·io_context;	110	····asio::io_context·io_context;
119		111
120	····using·namespace·std;·//·For·atoi.	112	····server·s(io_context,·std::atoi(argv[1]));
121	····server·s(io_context,·atoi(argv[1]));
122		113
123	····io_context.run();	114	····io_context.run();
124	··}	115	··}
125	··catch·(std::exception&·e)	116	··catch·(std::exception&·e)
126	··{	117	··{
127	····std::cerr·<<·"Exception:·"·<<·e.what()·<<·"\n";	118	····std::cerr·<<·"Exception:·"·<<·e.what()·<<·"\n";
128	··}	119	··}
129		120
130	··return·0;	121	··return·0;
131	}	122	}