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>

List of all members.

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.

---

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 80 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 86 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 49 of file Constraint.cc.

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

hitfit::Constraint::~Constraint

(

)

[inline]

Destructor.

Definition at line 107 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 113 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 62 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 137 of file Constraint.cc.

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

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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 163 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 156 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 161 of file Constraint.h.

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