1October 3, 2023 2 Libraries: A First Step Toward Standard C++ Dependency Management Bret Brown, C++ Infrastructure Lead, Bloomberg Bill Hoffman, CTO, KitwareHello! Welcome! Bret Brown C++ Infrastructure portable as the code they contain! ● ✓ Projects should be “cattle,” not “pets”! 7Why dependency management? 8Consensus: Managing dependencies == way too hard Q: Which of these do you find frustrating names: jsonlogConfig.cmake Jsonlog-config.cmake # ... CMake gives you some dependency management tips here ... 13 Aside: Coloring and bolding added for emphasisMotivation: What would we design

. . . . . . . 186 9.25 VirtualBox expert storage management . . . . . . . . . . . . . . . . . . . . . . . 186 9.26 Handling of host power management events . . . . . . . . . . . . . . . . . . . . 186 IDE/SATA flush requests . . . . . . . . . . . . . . . 204 12.2.3 Poor performance caused by host power management . . . . . . . . . . 204 12.2.4 GUI: 2D Video Acceleration option is grayed out . . . . . . . . to access USB devices from VirtualBox guests in the group vboxusers, either through the GUI user management tools or by running the following command as root: sudo usermod -a -G vboxusers username Note:

. . . . . . . 232 9.25 VirtualBox expert storage management . . . . . . . . . . . . . . . . . . . . . . . 232 9.26 Handling of host power management events . . . . . . . . . . . . . . . . . . . . 233 usage reporting . . . . . . . . . . . . . . . . . 265 12.2.6 Poor performance caused by host power management . . . . . . . . . . 265 12.2.7 GUI: 2D Video Acceleration option is grayed out . . . . . . . . to access USB devices from VirtualBox guests in the group vboxusers, either through the GUI user management tools or by running the following command as root: sudo usermod -a -G vboxusers username Note:

. . . . . . . 231 9.25 VirtualBox expert storage management . . . . . . . . . . . . . . . . . . . . . . . 231 9.26 Handling of host power management events . . . . . . . . . . . . . . . . . . . . 232 usage reporting . . . . . . . . . . . . . . . . . 264 12.2.6 Poor performance caused by host power management . . . . . . . . . . 264 12.2.7 GUI: 2D Video Acceleration option is grayed out . . . . . . . . to access USB devices from VirtualBox guests in the group vboxusers, either through the GUI user management tools or by running the following command as root: sudo usermod -a -G vboxusers username Note:

. . . . . . . 196 9.24 VirtualBox expert storage management . . . . . . . . . . . . . . . . . . . . . . . 196 9.25 Handling of host power management events . . . . . . . . . . . . . . . . . . . . 196 usage reporting . . . . . . . . . . . . . . . . . 215 12.2.6 Poor performance caused by host power management . . . . . . . . . . 215 12.2.7 GUI: 2D Video Acceleration option is grayed out . . . . . . . . to access USB devices from VirtualBox guests in the group vboxusers, either through the GUI user management tools or by running the following command as root: sudo usermod -a -G vboxusers username Note:

IDE/SATA flush requests . . . . . . . . . . . . . . . 183 12.2.3 Poor performance caused by host power management . . . . . . . . . . 183 12.2.4 GUI: 2D Video Acceleration option is grayed out . . . . . . . . to access USB devices from VirtualBox guests in the group vboxusers, either through the GUI user management tools or by running the following command as root: sudo usermod -a -G vboxusers username Note: member of that group. A user can be made a member of the group vboxusers through the GUI user/group management or at the command line with sudo usermod -a -G vboxusers username Note that adding an active user

--keepalive (or -k): This specifies the maximum number of requests which can be sent in one web service connection, and defaults to 100. This normally does not need to be changed. • --authentication (or -A): This the same whether you use the object-oriented web service (OOWS) for JAX-WS or a raw web service connection via, say, Perl, or whether you use C++ COM bindings. Some things are different depending on your 4.2, Authenticating at web service logon, page 25. 2.1.1.4 Object management The current OOWS for JAX-WS has certain memory management related limitations. When you no longer need an object, call its

--keepalive (or -k): This specifies the maximum number of requests which can be sent in one web service connection, and defaults to 100. This normally does not need to be changed. • --authentication (or -A): This the same whether you use the object-oriented web service (OOWS) for JAX-WS or a raw web service connection via, say, Perl, or whether you use C++ COM bindings. Some things are different depending on your 4.2, Authenticating at web service logon, page 25. 2.1.1.4 Object management The current OOWS for JAX-WS has certain memory management related limitations. When you no longer need an object, call its

and usually rethrows the exception 27 Bloomberg Exceptional Resource Management30 Bloomberg Exceptional Resource Management int process_file(const std::string& fileName_) { FILE * f = ::fopen(fileName_ ::fclose(f); throw; } ::fclose(f); return rc; } Resource release Bug31 Bloomberg Exceptional Resource Management Use RAII : struct FileManager { FileManager(const std::string& fileName_) : fptr{::fopen(fileName_ resource and usually rethrows the exception Conclusion : Use RAII over catch handlers for resource management 32 Bloomberg Exceptional Resource ManagementSituation : I have a potentially temporary problem