Acts::Neighbour< grid_t > Struct Template Reference

A class that helps in processing the neighbours, given a collection of middle space points The idea here is that in the seeding we look for compatible b-m and m-t doublets. More...

#include <Acts/Seeding/Neighbour.hpp>

Public Member Functions
	Neighbour ()=delete
	default constructor
	Neighbour (const grid_t &grid, std::size_t idx, const float lowerBound)
	Constructor.

Public Attributes
std::size_t	index
	The global bin index on the grid.
grid_t::value_type::const_iterator	itr
	The iterator containing the position of the first space point in the valid radius range.

Detailed Description

template<typename grid_t>
struct Acts::Neighbour< grid_t >

A class that helps in processing the neighbours, given a collection of middle space points The idea here is that in the seeding we look for compatible b-m and m-t doublets.

One of the requirements is that the bottom/top space point is at a suitable distance (in radius) w.r.t. the middle space point. We know however that the space points in each bin are sorted in radius. That means we can use this sorting in order to reduce the number of space point to consider when looking for compatible doublets. The idea is to keep track of first space point that is in the allowed bin, by storing its position using an iterator itr This helps us since the lower possible buondary is given by the first middle space point (its radius minus the mad deltaR defined by the user). The subsequent middle space point will have a higher radius. That means that there is no point in looking at neighbour space point before itr, since we know they will be out of range.

Constructor & Destructor Documentation

Neighbour() [1/2]

template<typename grid_t>

Acts::Neighbour< grid_t >::Neighbour ( )

delete

default constructor

Neighbour() [2/2]

template<typename grid_t>

Acts::Neighbour< grid_t >::Neighbour	(	const grid_t &	grid,
		std::size_t	idx,
		const float	lowerBound )

Constructor.

Parameters

grid	The grid containing the space points
idx	The global index of the bin in the grid
lowerBound	The lower bound of the allowed space point

Member Data Documentation

index

template<typename grid_t>

std::size_t Acts::Neighbour< grid_t >::index

The global bin index on the grid.

itr

template<typename grid_t>

grid_t::value_type::const_iterator Acts::Neighbour< grid_t >::itr

The iterator containing the position of the first space point in the valid radius range.