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annotate C++/modules/Socket/SocketListener.h @ 334:0b576ee64d45

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* Create brand new hierarchy * Rename DynLib to Dynlib * Remove some warnings
author David Demelier <markand@malikania.fr>
date Sun, 08 Mar 2015 14:26:33 +0100
parents C++/SocketListener.h@cba77da58496
children d235553e47a9
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1 /*
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2 * SocketListener.h -- portable select() wrapper
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3 *
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4 * Copyright (c) 2013, 2014 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #ifndef _SOCKET_LISTENER_NG_H_
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20 #define _SOCKET_LISTENER_NG_H_
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21
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22 #include <chrono>
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23 #include <functional>
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24 #include <initializer_list>
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25 #include <map>
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26 #include <memory>
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27 #include <utility>
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28 #include <vector>
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29
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30 #include "Socket.h"
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31
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32 #if defined(_WIN32)
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33 # if _WIN32_WINNT >= 0x0600
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34 # define SOCKET_HAVE_POLL
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35 # endif
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36 #else
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37 # define SOCKET_HAVE_POLL
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38 #endif
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39
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40 /**
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41 * @enum SocketMethod
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42 * @brief The SocketMethod enum
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43 *
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44 * Select the method of polling. It is only a preferred method, for example if you
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45 * request for poll but it is not available, select will be used.
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46 */
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47 enum class SocketMethod {
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48 Select, //!< select(2) method, fallback
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49 Poll //!< poll(2), everywhere possible
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50 };
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51
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52 /**
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53 * @struct SocketStatus
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54 * @brief The SocketStatus struct
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55 *
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56 * Result of a select call, returns the first ready socket found with its
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57 * direction.
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58 */
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59 class SocketStatus {
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60 public:
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61 Socket &socket; //!< which socket is ready
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62 int direction; //!< the direction
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63 };
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64
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65 /**
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66 * @class SocketListenerInterface
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67 * @brief Implement the polling method
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68 */
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69 class SocketListenerInterface {
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70 public:
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71 /**
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72 * Default destructor.
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73 */
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74 virtual ~SocketListenerInterface() = default;
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75
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76 /**
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77 * Add a socket with a specified direction.
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78 *
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79 * @param s the socket
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80 * @param direction the direction
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81 */
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82 virtual void set(Socket &sc, int direction) = 0;
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83
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84 /**
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85 * Remove a socket with a specified direction.
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86 *
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87 * @param s the socket
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88 * @param direction the direction
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89 */
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90 virtual void unset(Socket &sc, int direction) = 0;
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91
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92 /**
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93 * Remove completely a socket.
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94 *
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95 * @param sc the socket to remove
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96 */
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97 virtual void remove(Socket &sc) = 0;
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98
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99 /**
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100 * Remove all sockets.
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101 */
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102 virtual void clear() = 0;
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103
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104 /**
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105 * Select one socket.
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106 *
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107 * @param ms the number of milliseconds to wait, -1 means forever
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108 * @return the socket status
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109 * @throw error::Failure on failure
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110 * @throw error::Timeout on timeout
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111 */
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112 virtual SocketStatus select(int ms) = 0;
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113
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114 /**
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115 * Select many sockets.
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116 *
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117 * @param ms the number of milliseconds to wait, -1 means forever
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118 * @return a vector of ready sockets
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119 * @throw error::Failure on failure
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120 * @throw error::Timeout on timeout
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121 */
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122 virtual std::vector<SocketStatus> selectMultiple(int ms) = 0;
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123 };
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124
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125 /**
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126 * @class SocketListener
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127 * @brief Synchronous multiplexing
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128 *
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129 * Convenient wrapper around the select() system call.
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130 *
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131 * This class is implemented using a bridge pattern to allow different uses
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132 * of listener implementation.
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133 *
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134 * Currently, poll and select() are available.
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135 *
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136 * This wrappers takes abstract sockets as non-const reference but it does not
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137 * own them so you must take care that sockets are still alive until the
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138 * SocketListener is destroyed.
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139 */
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140 class SocketListener final {
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141 public:
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142 #if defined(SOCKET_HAVE_POLL)
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143 static constexpr const SocketMethod PreferredMethod = SocketMethod::Poll;
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144 #else
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145 static constexpr const SocketMethod PreferredMethod = SocketMethod::Select;
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146 #endif
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147
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148 static const int Read;
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149 static const int Write;
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150
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151 using Map = std::map<std::reference_wrapper<Socket>, int>;
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152 using Iface = std::unique_ptr<SocketListenerInterface>;
258
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153
315
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154 private:
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155 Map m_map;
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156 Iface m_interface;
258
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157
170
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158 public:
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159 /**
271
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160 * Move constructor.
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161 *
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162 * @param other the other object
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163 */
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164 SocketListener(SocketListener &&other) = default;
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165
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166 /**
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167 * Move operator.
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168 *
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169 * @param other the other object
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170 * @return this
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171 */
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172 SocketListener &operator=(SocketListener &&other) = default;
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173
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174 /**
258
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175 * Create a socket listener.
245
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176 *
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177 * @param method the preferred method
245
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178 */
315
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179 SocketListener(SocketMethod method = PreferredMethod);
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180
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181 /**
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182 * Create a listener from a list of sockets.
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183 *
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184 * @param list the list
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185 */
315
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186 SocketListener(std::initializer_list<std::pair<std::reference_wrapper<Socket>, int>> list);
278
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187
319
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188 /**
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189 * Return an iterator to the beginning.
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190 *
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191 * @return the iterator
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192 */
315
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193 inline auto begin() noexcept
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194 {
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195 return m_map.begin();
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196 }
245
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197
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198 /**
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199 * Overloaded function.
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200 *
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201 * @return the iterator
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202 */
315
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203 inline auto begin() const noexcept
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204 {
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205 return m_map.begin();
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206 }
316
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207
319
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208 /**
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209 * Overloaded function.
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210 *
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211 * @return the iterator
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212 */
315
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213 inline auto cbegin() const noexcept
258
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214 {
315
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215 return m_map.cbegin();
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216 }
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217
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218 /**
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219 * Return an iterator to the end.
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220 *
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221 * @return the iterator
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222 */
315
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223 inline auto end() noexcept
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224 {
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225 return m_map.end();
258
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226 }
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227
319
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228 /**
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229 * Overloaded function.
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230 *
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231 * @return the iterator
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232 */
315
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233 inline auto end() const noexcept
258
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234 {
315
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235 return m_map.end();
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236 }
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237
319
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238 /**
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239 * Overloaded function.
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240 *
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241 * @return the iterator
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242 */
315
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243 inline auto cend() const noexcept
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244 {
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245 return m_map.cend();
258
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246 }
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247
319
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248 /**
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249 * Add a socket to the listener.
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250 *
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251 * @param sc the socket
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252 * @param direction (may be OR'ed)
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253 */
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254 void set(Socket &sc, int direction);
315
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255
319
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256 /**
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257 * Unset a socket from the listener, only the direction is removed
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258 * unless the two directions are requested.
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259 *
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260 * For example, if you added a socket for both reading and writing,
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261 * unsetting the write direction will keep the socket for reading.
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262 *
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263 * @param sc the socket
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264 * @param direction the direction (may be OR'ed)
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265 * @see remove
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266 */
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267 void unset(Socket &sc, int direction) noexcept;
315
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268
319
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269 /**
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270 * Remove completely the socket from the listener.
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271 *
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272 * @param sc the socket
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273 */
315
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274 inline void remove(Socket &sc) noexcept
258
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275 {
315
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276 m_map.erase(sc);
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277 m_interface->remove(sc);
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278 }
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279
319
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280 /**
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281 * Remove all sockets.
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282 */
315
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283 inline void clear() noexcept
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284 {
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285 m_map.clear();
258
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286 m_interface->clear();
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287 }
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288
319
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289 /**
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290 * Get the number of sockets in the listener.
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291 */
315
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292 unsigned size() const noexcept
258
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293 {
315
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294 return m_map.size();
258
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295 }
194
9fc5f917872b Update Luae bits and LuaSocket
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296
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297 /**
258
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298 * Select a socket. Waits for a specific amount of time specified as the duration.
170
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299 *
270
46ccfbee84d9 Socket:
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300 * @param duration the duration
247
806dbb6011c7 Socket:
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301 * @return the socket ready
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302 */
258
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303 template <typename Rep, typename Ratio>
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304 inline SocketStatus select(const std::chrono::duration<Rep, Ratio> &duration)
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305 {
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306 auto cvt = std::chrono::duration_cast<std::chrono::milliseconds>(duration);
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307
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308 return m_interface->select(cvt.count());
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309 }
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310
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311 /**
297
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312 * Overload with milliseconds.
258
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313 *
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314 * @param timeout the optional timeout in milliseconds
258
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315 * @return the socket ready
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316 */
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317 inline SocketStatus select(int timeout = -1)
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318 {
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319 return m_interface->select(timeout);
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320 }
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321
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322 /**
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323 * Select multiple sockets.
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324 *
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325 * @param duration the duration
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326 * @return the socket ready
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327 */
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328 template <typename Rep, typename Ratio>
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329 inline std::vector<SocketStatus> selectMultiple(const std::chrono::duration<Rep, Ratio> &duration)
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330 {
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331 auto cvt = std::chrono::duration_cast<std::chrono::milliseconds>(duration);
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332
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333 return m_interface->selectMultiple(cvt.count());
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334 }
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335
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336 /**
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337 * Overload with milliseconds.
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338 *
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339 * @return the socket ready
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340 */
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341 inline std::vector<SocketStatus> selectMultiple(int timeout = -1)
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342 {
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343 return m_interface->selectMultiple(timeout);
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344 }
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345 };
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346
319
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347 #endif // !_SOCKET_LISTENER_NG_H_