# `Skuld.Comp.IIntercept`
[🔗](https://github.com/mccraigmccraig/skuld/blob/main/lib/skuld/comp/i_intercept.ex#L1)

Behaviour for effects supporting local interception via catch clauses.

This enables `catch` clauses in `comp` blocks to intercept effect-specific
values. Currently used by:

- `Throw` - intercepts errors for recovery
- `Yield` - intercepts yields for response generation

## Example

    defmodule Throw do
      @behaviour Skuld.Comp.IIntercept

      @impl Skuld.Comp.IIntercept
      def intercept(comp, handler_fn) do
        catch_error(comp, handler_fn)
      end
    end

## Usage in comp blocks

    comp do
      x <- risky_operation()
      x * 2
    catch
      {Throw, :not_found} -> :default  # calls Throw.intercept/2
    end

The `handler_fn` receives the intercepted value (effect-specific) and
must return a computation.

## See Also

- `Skuld.Comp.IHandle` - for effect operation handling
- `Skuld.Comp.IInstall` - for catch clause handler installation

# `intercept`

```elixir
@callback intercept(
  comp :: Skuld.Comp.Types.computation(),
  handler_fn :: (term() -&gt; Skuld.Comp.Types.computation())
) :: Skuld.Comp.Types.computation()
```

Intercept effect operations locally within a computation.

The `handler_fn` receives the intercepted value (effect-specific) and
must return a computation:

- For `Throw`: receives the error, returns recovery computation
- For `Yield`: receives the yield value, returns computation producing resume input

---

*Consult [api-reference.md](api-reference.md) for complete listing*