Template Class MultiTrajectory

Class Documentation

template<typename source_link_t>
class Acts::MultiTrajectory

Store a trajectory of track states with multiple components.

This container supports both simple, sequential trajectories as well as combinatorial or multi-component trajectories. Each point can store a parent point such that the trajectory forms a directed, acyclic graph of sub-trajectories. From a set of endpoints, all possible sub-components can be easily identified. Some functionality is provided to simplify iterating over specific sub-components.

Template Parameters

  • source_link_t: Type to link back to an original measurement

Public Types

enum [anonymous]

Values:

enumerator MeasurementSizeMax
using ConstTrackStateProxy = detail_lt::TrackStateProxy<SourceLink, MeasurementSizeMax, true>
using ProjectorBitset = std::bitset<eBoundSize * MeasurementSizeMax>
using SourceLink = source_link_t
using TrackStateProxy = detail_lt::TrackStateProxy<SourceLink, MeasurementSizeMax, false>

Public Functions

MultiTrajectory() = default

Create an empty trajectory.

size_t addTrackState(TrackStatePropMask mask = TrackStatePropMask::All, size_t iprevious = SIZE_MAX)

Add a track state without providing explicit information.

Which components of the track state are initialized/allocated can be controlled via mask

Return

Index of the newly added track state

Parameters

  • mask: The bitmask that instructs which components to allocate and which to leave invalid

  • iprevious: index of the previous state, SIZE_MAX if first

template<typename F>
void applyBackwards(size_t iendpoint, F &&callable)

Apply a function to all previous states starting at a given endpoint.

Warning

If the trajectory contains multiple components with common points, this can have an impact on the other components.

Parameters

  • iendpoint: index of the last state

  • callable: modifying functor to be called with each point

ConstTrackStateProxy getTrackState(size_t istate) const

Access a read-only point on the trajectory by index.

Return

Read only proxy to the stored track state

Parameters

  • istate: The index to access

TrackStateProxy getTrackState(size_t istate)

Access a writable point on the trajectory by index.

Return

Read-write proxy to the stored track state

Parameters

  • istate: The index to access

template<typename F>
void visitBackwards(size_t iendpoint, F &&callable) const

Visit all previous states starting at a given endpoint.

Parameters

  • iendpoint: index of the last state

  • callable: non-modifying functor to be called with each point

Friends

friend class detail_lt::TrackStateProxy< SourceLink, MeasurementSizeMax, false >
friend class detail_lt::TrackStateProxy< SourceLink, MeasurementSizeMax, true >