I have a trait Component and a variable let components: Vec<Box<dyn Component>> i need a function which returns true if components contains a value of type T
I was thinking something like this
fn has_component<T: Component>(entities: Vec<Box<dyn Component>>) -> bool;
I have tried messing around with std::any::type_name and TypeId with no luck. 
How would i implement this?
You could include the query in the trait. are_you_T methods for all T you want to check.
The Any trait with downcasting may help. This article has a section with good details.
Here's one way that doesn't force a 'static bound on your trait.
Based on this approach (which is based on the std trait Error).
This topic was automatically closed 90 days after the last reply. We invite you to open a new topic if you have further questions or comments.