C++11 使用中结者模式实现ChatRoom逻辑

本例使用中结者模式实现ChatRoom逻辑。就是一个ChatRoom持有多个Person类的实例，多个Person类公用一个ChatRoom的指针。使用ChatRoom指针实现聊天操作。
其中ChatRoom指针就是此处的中结者。

test/CMakeLists.txt

cmake_minimum_required(VERSION 2.6)if(APPLE)message(STATUS "This is Apple, do nothing.")set(CMAKE_MACOSX_RPATH 1)set(CMAKE_PREFIX_PATH /Users/aabjfzhu/software/vcpkg/ports/cppwork/vcpkg_installed/x64-osx/share )
elseif(UNIX)message(STATUS "This is linux, set CMAKE_PREFIX_PATH.")set(CMAKE_PREFIX_PATH /vcpkg/ports/cppwork/vcpkg_installed/x64-linux/share)
endif(APPLE)project(chat_room)set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-narrowing")add_definitions(-g)find_package(ZLIB)find_package(OpenCV REQUIRED )
find_package(Arrow CONFIG REQUIRED)find_package(unofficial-brotli REQUIRED)
find_package(unofficial-utf8proc CONFIG REQUIRED)
find_package(Thrift CONFIG REQUIRED)find_package(glog REQUIRED)find_package(OpenSSL REQUIRED)find_package(Boost REQUIRED COMPONENTSsystemfilesystemserializationprogram_optionsthread)find_package(DataFrame REQUIRED)if(APPLE)MESSAGE(STATUS "This is APPLE, set INCLUDE_DIRS")
set(INCLUDE_DIRS ${Boost_INCLUDE_DIRS} /usr/local/include /usr/local/iODBC/include /opt/snowflake/snowflakeodbc/include/ ${CMAKE_CURRENT_SOURCE_DIR}/../include/ ${CMAKE_CURRENT_SOURCE_DIR}/../../../include)
elseif(UNIX)MESSAGE(STATUS "This is linux, set INCLUDE_DIRS")set(INCLUDE_DIRS ${Boost_INCLUDE_DIRS} /usr/local/include ${CMAKE_CURRENT_SOURCE_DIR}/../include/   ${CMAKE_CURRENT_SOURCE_DIR}/../../../include/)
endif(APPLE)if(APPLE)MESSAGE(STATUS "This is APPLE, set LINK_DIRS")set(LINK_DIRS /usr/local/lib /usr/local/iODBC/lib /opt/snowflake/snowflakeodbc/lib/universal)
elseif(UNIX)MESSAGE(STATUS "This is linux, set LINK_DIRS")set(LINK_DIRS ${Boost_INCLUDE_DIRS} /usr/local/lib /vcpkg/ports/cppwork/vcpkg_installed/x64-linux/lib)
endif(APPLE)if(APPLE)MESSAGE(STATUS "This is APPLE, set ODBC_LIBS")set(ODBC_LIBS iodbc iodbcinst)
elseif(UNIX)MESSAGE(STATUS "This is linux, set LINK_DIRS")set(ODBC_LIBS odbc odbcinst ltdl)
endif(APPLE)include_directories(${INCLUDE_DIRS})
LINK_DIRECTORIES(${LINK_DIRS})file( GLOB test_file_list ${CMAKE_CURRENT_SOURCE_DIR}/*.cpp) file( GLOB APP_SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/../impl/*.cpp ${CMAKE_CURRENT_SOURCE_DIR}/../include/*.h ${CMAKE_CURRENT_SOURCE_DIR}/../include/*.cpp ${CMAKE_CURRENT_SOURCE_DIR}/../../../include/arr_/impl/*.cpp ${CMAKE_CURRENT_SOURCE_DIR}/../../../include/http/impl/*.cpp ${CMAKE_CURRENT_SOURCE_DIR}/../../../include/yaml/impl/*.cpp ${CMAKE_CURRENT_SOURCE_DIR}/../../../include/df/impl/*.cpp ${CMAKE_CURRENT_SOURCE_DIR}/../../../include/death_handler/impl/*.cpp)add_library(${PROJECT_NAME}_lib SHARED ${APP_SOURCES} ${test_file})
target_link_libraries(${PROJECT_NAME}_lib ${Boost_LIBRARIES} ZLIB::ZLIB glog::glog DataFrame::DataFrame ${OpenCV_LIBS})
target_link_libraries(${PROJECT_NAME}_lib OpenSSL::SSL OpenSSL::Crypto libgtest.a pystring libyaml-cpp.a libgmock.a ${ODBC_LIBS} libnanodbc.a pthread dl backtrace libzstd.a libbz2.a libsnappy.a re2::re2 parquet lz4 unofficial::brotli::brotlidec-static unofficial::brotli::brotlienc-static unofficial::brotli::brotlicommon-static utf8proc thrift::thrift  arrow arrow_dataset)foreach( test_file ${test_file_list} )file(RELATIVE_PATH filename ${CMAKE_CURRENT_SOURCE_DIR} ${test_file})string(REPLACE ".cpp" "" file ${filename})add_executable(${file}  ${test_file})target_link_libraries(${file} ${PROJECT_NAME}_lib)
endforeach( test_file ${test_file_list})

test/chat_room_test.cpp

#include "person.h"
#include "chatroom.h"#include <glog/logging.h>
#include <gtest/gtest.h>#include <fstream>
#include <memory>
#include <algorithm>#include "death_handler/death_handler.h"int main(int argc, char** argv) {FLAGS_log_dir = "./";FLAGS_alsologtostderr = true;// 日志级别 INFO, WARNING, ERROR, FATAL 的值分别为0、1、2、3FLAGS_minloglevel = 0;Debug::DeathHandler dh;google::InitGoogleLogging("./logs.log");testing::InitGoogleTest(&argc, argv);int ret = RUN_ALL_TESTS();return ret;
}// ChatRoom中结者模式简单演示
GTEST_TEST(ChatRoomTests, ChatRoom) {ChatRoom room;Person john {"john"};Person jane {"jane"};room.join(&john);room.join(&jane);john.say("hi room");jane.say("oh, hey john");Person simon {"simon"};room.join(&simon);simon.say("hi everyone");jane.pm("simon", "glad you could join us, simon");
}

include/person.h

#ifndef _FREDRIC_PERSON_H_
#define _FREDRIC_PERSON_H_#include <string>
#include <iostream>
#include <vector>struct ChatRoom;struct Person {std::string name;ChatRoom* room {nullptr};Person(std::string const& name_);void receive(std::string const& origin, std::string const& message);void say(std::string const& message) const;// Private message from this person to "who"void pm(std::string const& who, std::string const& message) const;std::vector<std::string> chat_log;friend bool operator==(Person const& lhs, Person const& rhs) {return lhs.name == rhs.name;}friend bool operator!=(Person const& lhs, Person const& rhs) {return !(lhs == rhs);}
};#endif

include/person.cpp

#include "person.h"
#include "chatroom.h"Person::Person(std::string const& name_): name{name_} {}void Person::receive(std::string const& origin, std::string const& message) {std::string s {origin + ": \"" + message +"\""};std::cout << "[" << name << "'s chat session]" << s << "\n";chat_log.emplace_back(s);
}void Person::say(std::string const& message) const {room->broadcast(name, message);
}void Person::pm(std::string const& who, std::string const& message) const {room->message(name, who, message);
}

include/chat_room.h

#ifndef _FREDRIC_CHAT_ROOM_H_
#define _FREDRIC_CHAT_ROOM_H_#include <vector>struct ChatRoom {std::vector<Person*> people;void join(Person* p);void broadcast(std::string const& origin, std::string const& message);void message(std::string const& origin, std::string const& who, std::string const& message);
};
#endif

include/chat_room.cpp

#include "person.h"
#include "chatroom.h"
#include <algorithm>void ChatRoom::broadcast(std::string const& origin, std::string const& message) {// 给除去自己以外的人广播这条消息for(auto&& p: people) {if(p->name != origin) {p->receive(origin, message);}}
}void ChatRoom::join(Person* p) {std::string join_msg = p->name + " joins the chat";broadcast("room", join_msg);p->room = this;people.push_back(p);
}// 从origin 给who发message
void ChatRoom::message(std::string const& origin, std::string const& who, std::string const& message) {auto target = std::find_if(people.begin(), people.end(), [&](Person const* p){return p->name == who;});if(target != people.end()) {(*target)->receive(origin, message);}
}

程序输出如下

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