Acts::NavigationPolicyStateManager Class Reference

Manager class for navigation policy states. More...

#include <Acts/Navigation/INavigationPolicy.hpp>

Public Member Functions
NavigationPolicyState	currentState ()
	Get the current (top) state from the stack.
void	popState ()
	Remove the current state from the stack.
template<typename T, typename... Args>
T &	pushState (Args &&... args)
	Push a new state onto the stack and construct it in-place.
void	reset ()
	Completely reset the state manager by clearing the stack.

Detailed Description

Manager class for navigation policy states.

Maintains a stack of type-erased states and provides access to the current state. Navigation policies use this manager to push and pop their states during navigation.

Member Function Documentation

currentState()

NavigationPolicyState Acts::NavigationPolicyStateManager::currentState

(

)

Get the current (top) state from the stack.

Returns

NavigationPolicyState wrapper for the current state, or empty state if stack is empty

popState()

void Acts::NavigationPolicyStateManager::popState

(

)

Remove the current state from the stack.

Exceptions

std::runtime_error

if the stack is empty

pushState()

template<typename T, typename... Args>

T & Acts::NavigationPolicyStateManager::pushState

(

Args &&...

args

)

Push a new state onto the stack and construct it in-place.

Template Parameters

T	The type of state to create
Args	The types of the constructor arguments

Parameters

args	Arguments to forward to the state constructor

Returns

Reference to the newly created state