## 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

## WEBPACK 5 WHY BREAKING CHANGES? A CHANGELOG ONLY TELLS HALF OF THE STORY TOBIAS KOPPERS ## TOBIAS KOPPERS • GITHUB: @sokra • TWITTER: @wSokra • 2012: I CREATED WEBPACK. • SINCE 2017: I WORK FULL-TIME WEBPACK 5 IS COMING. • OH NO THERE ARE BREAKING CHANGES. • THIS MAY BREAK MY BUILD. • I NEED TO INVEST TIME TO FIX IT. • WHY ARE THERE BREAKING CHANGES ANYWAY...? ## THE "WHY" • THIS TALK IS BREAKING CHANGES • BONUS: YOU GET TO KNOW THE BREAKING CHANGES. JUST TO BE PREPARED. • BONUS: YOU SEE THE BENEFITS OF THESE CHANGES ## MAJOR RELEASING - PEOPLE TEND TO DISLIKE BREAKING CHANGES • NOBODY

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?

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Language changes ..... 1986 108.3 Compiler/Runtime improvements ..... 1987 108.4 Command-line option changes ..... 1987 108.5 Multi-threading changes ..... 1987 108.6 Build system changes ..... 1987 New library functions ..... 1987 108.8 New library features ..... 1988 108.9 Standard library changes ..... 1989 108.10 Deprecated or removed ..... 1991 108.11 External dependencies ..... 1991 a "point" to one array $ [1,2,3] $ in memory. In contrast, an assignment a[i] = value changes the contents of the array, and the modified array will be visible through both the names a and b:

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2693 4.1.4 Contributing your changes to pandas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2694 4.1.5 Tips for a successful pandas documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2719 4.3.4 Previewing changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2720 4.4 Contributing recommended. It is highly recommended to use conda, for quick installation and for package and dependency updates. You can find simple installation instructions for pandas in this document: installation

Partitioning ..... 99 5.12. Foreign Data ..... 113 5.13. Other Database Objects ..... 113 5.14. Dependency Tracking ..... 114 6. Data Manipulation ..... 116 6.1. Inserting Data ..... 116 6.2. Updating Triggers ..... 1289 39.1. Overview of Trigger Behavior ..... 1289 39.2. Visibility of Data Changes ..... 1292 39.3. Writing Trigger Functions in C ..... 1293 39.4. A Complete Trigger Example Memory Management ..... 1511 47.4. Transaction Management ..... 1521 47.5. Visibility of Data Changes ..... 1524 47.6. Examples ..... 1524 48. Background Worker Processes ..... 1528 49. Logical

☐ Concepts ☐ Lambda Expression Changes • [=, this] as Lambda Capture • Templated Lambda Expressions • Pack Expansion in Lambda Captures ☐ constexpr Changes • virtual functions • union, try/catch try/catch, dynamic_cast, typeid • allocations • constexpr string & vector ☐ Concurrency Changes • Atomic Smart Pointers • Joining & Cancellable Threads • The C++20 Synchronization Library  "How C++20 Changes the Way We Write Code" -- Timur Doumler Friday, September 18 • 12:00

Incompatible API changes with version 6.0 ..... 423 13.2 Incompatible API changes with version 5.x ..... 424 13.3 Incompatible API changes with version 5.0 ..... 424 13.4 Incompatible API changes with version Incompatible API changes with version 4.2 ..... 429 13.6 Incompatible API changes with version 4.1 ..... 430 13.7 Incompatible API changes with version 4.0 ..... 431 13.8 Incompatible API changes with version Incompatible API changes with version 3.1 ..... 434 13.10 Incompatible API changes with version 3.0 436 13.11 Incompatible API changes with version 2.2 436 13.12 Incompatible API changes with version 2

7.1 Incompatible API changes with version 3.2 39 7.2 Incompatible API changes with version 3.1 40 7.3 Incompatible API changes with version 3.0 41 7.4 Incompatible API changes with version 2.2 42 42 7.5 Incompatible API changes with version 2.1 42 8 License information 44 9 Classes (interfaces) 45 9.1 IAppliance 45 9.1.1 Attributes 46 9.1.2 createVFSExplorer 47 9.1.3 getWarnings setprop config/user=root If you made any change, don’t forget to run the following command to put the changes into effect immediately: svcadm refresh svc:/application/virtualbox/webservice:default If you forget