## 20 24 September 15 - 20 ## +24 ## Dependency Injection in C++ A Practical Guide ## PETER MULDOON # Dependency Injection in C++: A Practical Guide Engineering CppCon 2024 September 18, 2024 Pete away and be able to use it ## Where will we be going? - Talk will be about inserting meaningful Dependency Injection in applications - Using various DI methods to achieve functionality swapping / instrumentation (or just giving up) • Talk is rooted in a real-world system not theory ## Basic Definitions ## Dependency Injection : 1. Decreases coupling between functionality blocks 2. Used to make a class/function

First Step Toward Standard C++ Dependency Management ## BILL HOFFMAN & BRET BROWN ## 20 23 October 01 - 06 ## Libraries: A First Step Toward Standard C++ Dependency Management October 3, 2023 Bloomberg Projects as portable as the code they contain! ✓ Projects should be “cattle,” not “pets”! ## Why dependency management? Consensus: Managing dependencies == way too hard Q: Which of these do you find frustrating What's a dependency bug? Missing interfaces: fangorn.cxx:2:10: fatal error: jsonlog/core.hxx: No such file or directory This could be caused by other root problems! Pain: What's a dependency bug?

auto-configuration ..... 33 16.2. Disabling specific auto-configuration ..... 33 17. Spring Beans and dependency injection ..... 34 18. Using the @SpringBootApplication annotation ..... 35 19. Running your Gradle plugin ..... 135 59.1. Including the plugin ..... 135 59.2. Declaring dependencies without versions ..... 135 Custom version management ..... 136 59.3. Default exclude rules ..... 136 59 Configuring Gradle to produce a pom that inherits dependency management ..... 140 Configuring Gradle to produce a pom that imports dependency management ..... 141 60. Supporting other build systems

What to read next ..... 22 III. Using Spring Boot ..... 23 13. Build systems ..... 24 13.1. Dependency management ..... 24 13.2. Maven ..... 24 Inheriting the starter parent ..... 25 Using auto-configuration ..... 37 16.2. Disabling specific auto-configuration ..... 37 17. Spring Beans and dependency injection ..... 38 18. Using the @SpringBootApplication annotation ..... 39 19. Running your coordinates ..... 199 Default import statements ..... 199 Automatic main method ..... 199 Custom dependency management ..... 199 59.2. Testing your code ..... 200 59.3. Applications with multiple source

## Note In case there will be big demand for this feature, it might be implemented in future versions, but it’s definitely not a priority for now. ## Why does Weblate use language codes such as sr_Latn -toolkit/en/latest/formats/index.html] ## Adding new translations Changed in version 2.18: In versions prior to 2.18 the behaviour of adding new translations was file format specific. Weblate can automatically [https://git-scm.com/docs/git-svn#git-svn---stdlayout] for more information. Changed in version 2.19: In older versions only repositories with standard layout were supported. ## Subversion Credentials Weblate expects

Weblate. ## Note In case there is great demand for this feature, it might be implemented in future versions. ## Why does Weblate use language codes such as sr_Latn or zh_Hant? These are language codes defined -toolkit/en/latest/formats/index.html] ## Adding new translations Changed in version 2.18: In versions prior to 2.18 the behaviour of adding new translations was file format specific. Weblate can automatically this it is the 3.0.1-7) image, which will do the migration and then continue upgrading to newer versions. You might also want to update the docker -compose repository, though it's not needed in most

Next ..... 21 6. Developing with Spring Boot ..... 23 6.1. Build Systems ..... 23 6.1.1. Dependency Management ..... 23 6.1.2. Maven ..... 23 6.1.3. Gradle ..... 23 6.1.4. Ant ..... 24 6 ... 32 6.4.2. Disabling Specific Auto-configuration Classes ..... 32 6.5. Spring Beans and Dependency Injection ..... 33 6.6. Using the @SpringBootApplication Annotation ..... 35 6.7. Running Your 226 7.10.3. Kotlin API ..... 226 runApplication ..... 226 Extensions ..... 227 7.10.4. Dependency management ..... 227 7.10.5. @ConfigurationProperties ..... 227 7.10.6. Testing ..... 228

What to Read Next ..... 22 III. Using Spring Boot ..... 23 13. Build Systems ..... 24 13.1. Dependency Management ..... 24 13.2. Maven ..... 24 Inheriting the Starter Parent ..... 25 Using ..... 36 16.2. Disabling Specific Auto-configuration Classes ..... 36 17. Spring Beans and Dependency Injection ..... 37 18. Using the @SpringBootApplication Annotation ..... 38 19. Running Your ... 188 48.3. Kotlin API ..... 189 runApplication ..... 189 Extensions ..... 189 48.4. Dependency management ..... 189 48.5. @ConfigurationProperties ..... 190 48.6. Testing ..... 190 48

Creating an executable jar 12. What to read next III. Using Spring Boot 13. Build systems Dependency management Maven Inheriting the starter parent Using Spring Boot without the parent Gradually replacing auto-configuration Disabling specific auto-configuration 17. Spring Beans and dependency injection 18. Using the @SpringBootApplication annotation 19. Running your application Running "grab" coordinates Default import statements Automatic main method Custom dependency management Testing your code Applications with multiple source files Packaging your application

Next ..... 20 6. Developing with Spring Boot ..... 22 6.1. Build Systems ..... 22 6.1.1. Dependency Management ..... 22 6.1.2. Maven ..... 22 6.1.3. Gradle ..... 22 6.1.4. Ant ..... 23 6 Auto-configuration Classes ..... 31 6.4.3. Auto-configuration Packages ..... 31 6.5. Spring Beans and Dependency Injection ..... 32 6.6. Using the @SpringBootApplication Annotation ..... 34 6.7. Running Your 228 7.11.3. Kotlin API ..... 229 runApplication ..... 229 Extensions ..... 229 7.11.4. Dependency management ..... 230 7.11.5. @ConfigurationProperties ..... 230 7.11.6. Testing ..... 230