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 # helios::engine::state::listeners
 
 Listeners for observing state transitions.
 
 ## Components
 
 | Class | Description |
 |-------|-------------|
 | `LambdaStateListener<StateType>` | Lambda-based listener implementation |
 
 ## Usage
 
 ### Full listener (exit, transition, enter)
 
 ```cpp
 using namespace helios::engine::state::listeners;
 
 auto listener = std::make_unique<LambdaStateListener<GameState>>(
  // onExit
  [](auto& ctx, GameState from) {
  // Handle state exit
  },
  // onTransition
  [](auto& ctx, auto transitionCtx) {
  // Handle transition
  },
  // onEnter
  [](auto& ctx, GameState to) {
  // Handle state entry
  }
 );
 
 stateManager.addStateListener(std::move(listener));
 ```
 
 ### Enter-only listener
 
 ```cpp
 auto enterListener = std::make_unique<LambdaStateListener<GameState>>(
  [](auto& ctx, GameState to) {
  // Handle state entry
  }
 );
 ```
 
 ### Transition-only listener
 
 ```cpp
 auto transitionListener = std::make_unique<LambdaStateListener<GameState>>(
  [](auto& ctx, StateTransitionContext<GameState> transitionCtx) {
  // Handle transition
  }
 );
 ```
 
 ---
 <details>
 <summary>Doxygen</summary><p>
 @namespace helios::engine::state::listeners
 @brief State transition listeners.
 @details Provides listener implementations for reacting to state changes.
 </p></details>
 

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