hitfit::Constraint Class Reference

Represent a mass constraint equation. Mass constraints come in two varieties, either saying that the sum of a set of labels should equal a constant:
More...

#include <Constraint.h>

Public Member Functions
	Constraint (std::string s)
	Constraint (const Constraint &c)
int	has_labels (int ilabel, int jlabel) const
Constraint &	operator= (const Constraint &c)
double	sum_mass_terms (const Fourvec_Event &ev) const
	~Constraint ()

Private Attributes
std::auto_ptr < Constraint_Intermed >	_lhs
std::auto_ptr < Constraint_Intermed >	_rhs

Friends
std::ostream &	operator<< (std::ostream &s, const Constraint &c)
	Output stream operator, print the content of this Constraint to an output stream. More...

Detailed Description

Represent a mass constraint equation. Mass constraints come in two varieties, either saying that the sum of a set of labels should equal a constant:

.

or that two such sums should be equal to each other:

.

We represent such a constraint equation by two Constraint_Intermed instances, each of which represents one side of the equation.

Definition at line 79 of file Constraint.h.

Constructor & Destructor Documentation

hitfit::Constraint::Constraint

(

std::string

s

)

Constructor.

Parameters

s	The string to parse describing the constraint.

Definition at line 85 of file Constraint.cc.

References _lhs, _rhs, i, and hitfit::make_constraint_intermed().

{
  // Split it at the equals sign.
  string::size_type i = s.find ('=');
  assert (i != string::npos);

  // And then build the two halves.
  {
    auto_ptr<Constraint_Intermed> ci =
      make_constraint_intermed (s.substr (0, i));
    _lhs = ci;
  }
  {
    auto_ptr<Constraint_Intermed> ci =
      make_constraint_intermed (s.substr (i+1));
    _rhs = ci;
  }
}

hitfit::Constraint::Constraint

(

const Constraint &

c

)

Copy constructor.

Parameters

c	The original object to be copied.

Definition at line 48 of file Constraint.cc.

  : _lhs (c._lhs->clone ()),
    _rhs (c._rhs->clone ())
{
}

hitfit::Constraint::~Constraint ( )

inline

Destructor.

Definition at line 106 of file Constraint.h.

{}

Member Function Documentation

int hitfit::Constraint::has_labels	(	int	ilabel,
		int	jlabel
	)		const

See if this guy references both labels ilabel and jlabel on a single single side of the constraint equation.

Parameters

ilabel	The first label to test.
jlabel	The second label to test.

Return:

• +1 if the LHS references both.
• -1 if the RHS references both.
• 0 if neither reference both.

Definition at line 112 of file Constraint.cc.

{
  if (_lhs->has_labels (ilabel, jlabel))
    return 1;
  else if (_rhs->has_labels (ilabel, jlabel))
    return -1;
  else
    return 0;
}

Constraint & hitfit::Constraint::operator=

(

const Constraint &

c

)

Assignment operator.

Parameters

c	The original object to be copied.

Definition at line 61 of file Constraint.cc.

References _lhs, and _rhs.

{
  {
    auto_ptr<Constraint_Intermed> ci = c._lhs->clone ();
    _lhs = ci;
  }
  {
    auto_ptr<Constraint_Intermed> ci = c._rhs->clone ();
    _rhs = ci;
  }

  return *this;
}

double hitfit::Constraint::sum_mass_terms

(

const Fourvec_Event &

ev

)

const

Evaluate the mass constraint, using the data in ev.

Parameters

ev	The event for which the constraint should be evaluated.

Return:

Definition at line 136 of file Constraint.cc.

References ev.

{
  return _lhs->sum_mass_terms (ev) - _rhs->sum_mass_terms (ev);
}

Friends And Related Function Documentation

std::ostream& operator<< ( std::ostream &  s, const Constraint &  c  )

friend

Output stream operator, print the content of this Constraint to an output stream.

Parameters

s	The stream to which to write.
c	The instance of Constraint to be printed.

Definition at line 162 of file Constraint.cc.

{
  s << *c._lhs.get() << " = " << *c._rhs.get();
  return s;
}

Member Data Documentation

std::auto_ptr<Constraint_Intermed> hitfit::Constraint::_lhs

private

Left hand side of the constraint.

Definition at line 155 of file Constraint.h.

Referenced by Constraint(), hitfit::operator<<(), and operator=().

std::auto_ptr<Constraint_Intermed> hitfit::Constraint::_rhs

private

Right hand side of the constraint.

Definition at line 160 of file Constraint.h.

Referenced by Constraint(), hitfit::operator<<(), and operator=().