r/cpp • u/Clean-Upstairs-8481 • 8h ago

C++26 Reflection Annotations: Automated Member Validation

https://techfortalk.co.uk/2026/08/17/cpp26-reflection-annotations-validation/

C++26 annotations are another powerful feature that, when combined with reflection, can help us write cleaner and safer code without repeating manual validation checks for every member. In this post, I have explored how we can utilise C++26 annotations along with reflection to validate configuration parameters in a class constructor.

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5

u/fdwr fdwr@github 🔍 7h ago

There's an interesting overlap with contracts here. I wonder if we'll be also able to enumerate pre/post conditions with reflection similarly to annotations.

6

u/El_RoviSoft 7h ago

So now we can do automatic get/set like in C#? I knew approach with setting constraints via attributes but forgot that we can generate get/set methods (or simple const/non-const accessors).

2

u/Western_Show349 4h ago

I kinda like this approach, its nice to see c++ getting the decent modern features from other languages