# Feature: CallbackSet

## Overview

CallbackSet allows composing multiple callbacks (both continuous and discrete) with controlled ordering and execution priority. Essential for complex simulations with multiple events.

## Why This Feature Matters

- Manage multiple callbacks cleanly
- Control execution order
- Enable/disable callbacks dynamically
- Foundation for advanced callback patterns

## Dependencies

- Discrete callbacks (feature #5)
- Continuous callbacks (already implemented)

## Implementation Approach

```rust
pub struct CallbackSet<'a, const D: usize, P> {
    continuous_callbacks: Vec<ContinuousCallback<'a, D, P>>,
    discrete_callbacks: Vec<DiscreteCallback<'a, D, P>>,
    // Optional: priority/ordering information
}
```

## Implementation Tasks

- [ ] Define CallbackSet struct
- [ ] Builder pattern for adding callbacks
- [ ] Execution order management
- [ ] Integration with Problem solve loop
- [ ] Testing with multiple callbacks
- [ ] Documentation

## Complexity Estimate

**Effort**: Small (3-4 hours)
**Risk**: Low