Function downcast_ref 

pub fn downcast_ref<T: ExecutionContext + 'static>(
    context: &dyn ExecutionContext,
) -> Option<&T>

Attempt to downcast a context reference to a concrete type

This function safely converts a trait object reference to a reference of the concrete type T. If the context is not of type T, it returns None.

Type Parameters

• T - The concrete type to downcast to. Must implement ExecutionContext and have a 'static lifetime.

Arguments

• context - Reference to the execution context trait object

Returns

• Some(&T) if the context is of type T
• None if the context is a different type

Example

use dynamic_cli::context::{ExecutionContext, downcast_ref};
use std::any::Any;

struct DatabaseContext {
    connection_string: String,
}

impl ExecutionContext for DatabaseContext {
    fn as_any(&self) -> &dyn Any { self }
    fn as_any_mut(&mut self) -> &mut dyn Any { self }
}

fn get_connection(ctx: &dyn ExecutionContext) -> Option<&str> {
    downcast_ref::<DatabaseContext>(ctx)
        .map(|db| db.connection_string.as_str())
}

Safety

This operation is safe because it uses Rust’s Any::downcast_ref, which performs runtime type checking.