HLT::CombinationGenerator Class Reference

#include <Combinators.h>

Collaboration diagram for HLT::CombinationGenerator:

Public Member Functions
	CombinationGenerator (const std::initializer_list< size_t > &collectionSizes)
	construct combnations maker with the sizes of collection to which it should be applied
void	add (size_t nextColl)
void	reset ()
size_t	size () const
const std::vector< size_t > &	operator() () const
	returns current combination
const std::vector< size_t > &	current () const
void	operator++ ()
	moves to the next combination
	operator bool () const
	are combinations exhausted

Private Attributes
std::vector< size_t >	m_maxes
std::vector< size_t >	m_current

Detailed Description

Definition at line 18 of file TrigCompositeUtils/TrigCompositeUtils/Combinators.h.

Constructor & Destructor Documentation

CombinationGenerator()

CombinationGenerator::CombinationGenerator

(

const std::initializer_list< size_t > &

collectionSizes

)

construct combnations maker with the sizes of collection to which it should be applied

Definition at line 12 of file Combinators.cxx.

  : m_maxes( collectionSizes ),
    m_current( m_maxes.size() ) {
  reset();
 
}

Member Function Documentation

add()

void HLT::CombinationGenerator::add ( size_t nextColl )

inline

Definition at line 24 of file TrigCompositeUtils/TrigCompositeUtils/Combinators.h.

{ m_maxes.push_back( nextColl ); reset(); }

current()

const std::vector< size_t > & HLT::CombinationGenerator::current ( ) const

inline

Definition at line 31 of file TrigCompositeUtils/TrigCompositeUtils/Combinators.h.

{ return m_current; }

operator bool()

CombinationGenerator::operator bool

(

)

const

are combinations exhausted

Definition at line 52 of file Combinators.cxx.

                                          {
  return not m_current.empty();
}

operator()()

const std::vector< size_t > & HLT::CombinationGenerator::operator() ( ) const

inline

returns current combination

Definition at line 30 of file TrigCompositeUtils/TrigCompositeUtils/Combinators.h.

{ return m_current; }

operator++()

void CombinationGenerator::operator++

(

)

moves to the next combination

Definition at line 29 of file Combinators.cxx.

                                      {
  if ( m_current.empty() )  return;  
  for ( size_t i = 0, imax = m_current.size(); i < imax; ++i ) { // iterate over current indices and find the index which can be increased
    if ( m_maxes[i] - m_current[i] == 1 ) { // reached end of the range of i-th collection, return to the beginning
      m_current[i] = 0;
    } else {
      m_current[i]++;
      return;
    }
  }
  
  // unsuccessful index increase == we need to make op bool returning false and next ++ should not happen
  m_current.clear();
}

reset()

void CombinationGenerator::reset

(

)

Definition at line 19 of file Combinators.cxx.

                                 {
  // no combinations when at least one the sizes is 0 ( empty collection )
  if ( std::any_of( m_maxes.begin(), m_maxes.end(),
            []( size_t m ){ return m == 0; } ) )
    m_current.clear(); 
  else {
    fill( m_current.begin(), m_current.end(), 0 );
  }
}

size()

size_t HLT::CombinationGenerator::size ( ) const

inline

Definition at line 26 of file TrigCompositeUtils/TrigCompositeUtils/Combinators.h.

{ return m_maxes.size(); }

Member Data Documentation

m_current

std::vector<size_t> HLT::CombinationGenerator::m_current

private

Definition at line 44 of file TrigCompositeUtils/TrigCompositeUtils/Combinators.h.

m_maxes

std::vector<size_t> HLT::CombinationGenerator::m_maxes

private

Definition at line 43 of file TrigCompositeUtils/TrigCompositeUtils/Combinators.h.

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The documentation for this class was generated from the following files:

• TrigCompositeUtils/TrigCompositeUtils/Combinators.h
• Combinators.cxx