Detailed Description

Mathematical modeling expression.

Expressions are used to build the mathematical optimization model associated to LocalSolver. An expression is composed of an operator (which corresponds to its type) and its operands (which are other expressions of the model).

See Also: LSModel; LSOperator

Public Member Functions
LSOperator	getOperator () const
	Gets the operator of this expression.
int	getIndex () const
	Gets the index of this expression in the model.
bool	isConstant () const
	Returns true if this expression is typed as constant in the model, false otherwise.
bool	isDecision () const
	Returns true if this expression is typed as decision in the model, false otherwise.
bool	isConstraint () const
	Returns true if this expression is tagged as constraint in the model, false otherwise.
bool	isObjective () const
	Returns true if this expression is tagged as objective in the model, false otherwise.
bool	isDouble () const
	Returns true if this expression is a double, false otherwise.
bool	isInt () const
	Returns true if this expression is an integer, false otherwise.
bool	isBool () const
	Returns true if this expression is a boolean (ie 0 or 1), false otherwise.
bool	isArray () const
	Returns true if this expression is an array, false otherwise.
bool	isCollection () const
	Returns true if this expression is a collection, false otherwise.
void	addOperand (const LSExpression &expr)
	Adds the given operand to this expression.
void	addOperand (int constant)
	Add the given constant operand to this expression.
void	addOperand (lsint constant)
	Add the given constant operand to this expression.
void	addOperand (lsdouble constant)
	Add the given constant operand to this expression.
template<typename T0 , typename T1 >
void	addOperands (T0 begin, T1 end)
	Add the given operands to this expression.
LSExpression	getOperand (int operandIndex) const
	Gets the operand with the given index.
void	setOperand (int operandIndex, LSExpression operand)
	Replaces the operand of the given index.
void	setOperand (int operandIndex, lsint constant)
	Replaces the operand of the given index.
void	setOperand (int operandIndex, lsdouble constant)
	Replaces the operand of the given index.
int	getNbOperands () const
	Gets the number of operands of this expression.
void	setValue (lsint value)
	Sets the value of this expression in the current solution found by the solver.
void	setValue (lsdouble value)
	Sets the value of this expression in the current solution found by the solver.
void	setIntValue (lsint value)
	Sets the value of this expression in the current solution found by the solver.
void	setDoubleValue (lsdouble value)
	Sets the value of this expression in the current solution found by the solver.
lsint	getValue () const
	Gets the value of this expression in the best solution found by the solver.
lsint	getIntValue () const
	Gets the value of this expression in the best solution found by the solver.
lsdouble	getDoubleValue () const
	Gets the value of this expression in the best solution found by the solver.
bool	isViolated () const
	Returns true if the given expression is violated in the best solution found by the solver.
LSCollection	getCollectionValue () const
	Gets the value of this expression in the best solution found by the solver.
void	setName (const std::string &name)
	Sets the name of this expression.
bool	isNamed () const
	Returns true if this expression has a name, and false otherwise.
const std::string	getName () const
	Gets the name of this expression or the empty string if no name has been set.
std::string	toString () const
	Returns a string representation of this expression.
std::string	getInfo () const
	Returns useful info about this expression (according to the state of LocalSolver).

Member Function Documentation

LSOperator localsolver::LSExpression::getOperator ( ) const

inline

Gets the operator of this expression.

Returns: Operator.

int localsolver::LSExpression::getIndex ( ) const

inline

Gets the index of this expression in the model.

Returns: Index in the model.

bool localsolver::LSExpression::isConstant ( ) const

inline

Returns true if this expression is typed as constant in the model, false otherwise.

Returns: True if typed as constant.

bool localsolver::LSExpression::isDecision ( ) const

inline

Returns true if this expression is typed as decision in the model, false otherwise.

Returns: True if typed as decision.

bool localsolver::LSExpression::isConstraint ( ) const

inline

Returns true if this expression is tagged as constraint in the model, false otherwise.

Returns: True if tagged as constraint.

bool localsolver::LSExpression::isObjective ( ) const

inline

Returns true if this expression is tagged as objective in the model, false otherwise.

Returns: True if tagged as objective.

bool localsolver::LSExpression::isDouble ( ) const

inline

Returns true if this expression is a double, false otherwise.

Only allowed in states S_Paused or S_Stopped.

Returns: True if the expression is a double.

Since: 3.0

bool localsolver::LSExpression::isInt ( ) const

inline

Returns true if this expression is an integer, false otherwise.

Only allowed in states S_Paused or S_Stopped. Note that a boolean is also an integer.

Returns: True if the expression is a double.

Since: 3.0

bool localsolver::LSExpression::isBool ( ) const

inline

Returns true if this expression is a boolean (ie 0 or 1), false otherwise.

Only allowed in states S_Paused or S_Stopped.

Returns: True if the expression is a boolean.

Since: 3.0

bool localsolver::LSExpression::isArray ( ) const

inline

Returns true if this expression is an array, false otherwise.

Only allowed in states S_Paused or S_Stopped.

Returns: True if the expression is an array.

Since: 3.1

bool localsolver::LSExpression::isCollection ( ) const

inline

Returns true if this expression is a collection, false otherwise.

Only allowed in states S_Paused or S_Stopped.

Returns: True if the expression is a collection.

Since: 5.5

void localsolver::LSExpression::addOperand ( const LSExpression & expr )

inline

Adds the given operand to this expression.

Only allowed in state S_Modeling.

Parameters

expr	Operand to add.

void localsolver::LSExpression::addOperand ( int constant )

inline

Add the given constant operand to this expression.

Only allowed in state S_Modeling.

Parameters

constant Constant operand to add.

void localsolver::LSExpression::addOperand ( lsint constant )

inline

Add the given constant operand to this expression.

Only allowed in state S_Modeling.

Parameters

constant Constant operand to add.

void localsolver::LSExpression::addOperand ( lsdouble constant )

inline

Add the given constant operand to this expression.

Only allowed in state S_Modeling.

Parameters

constant Constant operand to add.

Since: 3.0

template<typename T0 , typename T1 >

void localsolver::LSExpression::addOperands	(	T0	begin,
		T1	end
	)

inline

Add the given operands to this expression.

Only allowed in state S_Modeling.

Parameters

begin	iterator to the initial position of the operands to add.
end	iterator to the final position of the operands to add.

Since: 5.5

LSExpression localsolver::LSExpression::getOperand ( int operandIndex ) const

inline

Gets the operand with the given index.

Parameters

operandIndex Index of the operand.

Returns: Operand.

void localsolver::LSExpression::setOperand	(	int	operandIndex,
		LSExpression	operand
	)

inline

Replaces the operand of the given index.

Parameters

operandIndex	Index of the operand to change
operand	New operand

void localsolver::LSExpression::setOperand	(	int	operandIndex,
		lsint	constant
	)

inline

Replaces the operand of the given index.

Parameters

operandIndex	Index of the operand to change.
constant	New constant operand.

void localsolver::LSExpression::setOperand	(	int	operandIndex,
		lsdouble	constant
	)

inline

Replaces the operand of the given index.

Parameters

operandIndex	Index of the operand to change.
constant	New constant operand.

Since: 3.0

int localsolver::LSExpression::getNbOperands ( ) const

inline

Gets the number of operands of this expression.

Returns: Number of operands.

void localsolver::LSExpression::setValue ( lsint value )

inline

Sets the value of this expression in the current solution found by the solver.

Only allowed for decisions. Only allowed in state S_Stopped. Only allowed if this expression is an integer or a boolean. If the solver was not launched, this value will be used as an initial value for the decision. This method is a shortcut for LSSolution#setValue(LSExpression, lsint) and has the same behavior as setIntValue(lsint).

Parameters

value Value assigned to this expression.

See Also: LSSolution::setValue(LSExpression, lsint); isInt(); isBool()

void localsolver::LSExpression::setValue ( lsdouble value )

inline

Sets the value of this expression in the current solution found by the solver.

Only allowed for decisions. Only allowed in state #S_Stopped. Only allowed if this expression is an integer or a boolean. If the solver was not launched, this value will be used as an initial value for the decision. This method is a shortcut for LSSolution#setValue(LSExpression, lsdouble) and has the same behavior as setDoubleValue(lsdouble).

Parameters

value Value assigned to this expression.

See Also: LSSolution::setValue(LSExpression expr, lsdouble value); isDouble()

void localsolver::LSExpression::setIntValue ( lsint value )

inline

Sets the value of this expression in the current solution found by the solver.

Only allowed for decisions. Only allowed in state S_Stopped. Only allowed if this expression is an integer or a boolean. If the solver was not launched, this value will be used as an initial value for the decision. This method is a shortcut for LSSolution#setValue(LSExpression, lsint).

Parameters

value Value assigned to this expression.

See Also: LSSolution::setIntValue(LSExpression, lsint); isInt(); isBool()

Since: 3.0

void localsolver::LSExpression::setDoubleValue ( lsdouble value )

inline

Sets the value of this expression in the current solution found by the solver.

Only allowed for decisions. Only allowed in state S_Stopped. Only allowed if this expression is a double. If the solver was not launched, this value will be used as an initial value for the decision. This method is a shortcut for LSSolution#setValue(LSExpression, lsdouble).

Parameters

value Value assigned to this expression.

See Also: LSSolution::setDoubleValue(LSExpression, lsdouble); isDouble()

Since: 3.0

lsint localsolver::LSExpression::getValue ( ) const

inline

Gets the value of this expression in the best solution found by the solver.

Only allowed in states S_Paused or S_Stopped. Only allowed if this expression is an integer or a boolean. This method is a shortcut for LSSolution#getValue(LSExpression).

Returns: Value in the best solution.

See Also: LSSolution::getValue(LSExpression); isInt(); isBool()

lsint localsolver::LSExpression::getIntValue ( ) const

inline

Gets the value of this expression in the best solution found by the solver.

Only allowed in states S_Paused or S_Stopped. Only allowed if this expression is an integer or a boolean. This method is a shortcut for LSSolution#getIntValue(LSExpression).

Returns: Value in the best solution.

See Also: LSSolution::getIntValue(LSExpression); isInt(); isBool()

Since: 3.0

lsdouble localsolver::LSExpression::getDoubleValue ( ) const

inline

Gets the value of this expression in the best solution found by the solver.

Only allowed in states S_Paused or S_Stopped. Only allowed if this expression is a double. This method is a shortcut for LSSolution#getDoubleValue(LSExpression).

Returns: Value in the best solution.

See Also: LSSolution::getDoubleValue(LSExpression); isDouble()

Since: 3.0

bool localsolver::LSExpression::isViolated ( ) const

inline

Returns true if the given expression is violated in the best solution found by the solver.

An expression can be violated in 3 cases:

it is a constraint and its value is 0
it is a a double and its value is NaN (NotANumber)
it is an integer or boolean with no valid value (arithmetic or out of bounds exception). Only allowed in states S_Paused or S_Stopped. This method is a shortcut for LSSolution#isViolated(LSExpression).

Returns: True if this expression is violated in the best solution.

Since: 5.5

LSCollection localsolver::LSExpression::getCollectionValue ( ) const

inline

Gets the value of this expression in the best solution found by the solver.

Only allowed in states S_Paused or S_Stopped. Only allowed if this expression is a collection (list). This method is a shortcut for LSSolution#getCollectionValue(LSExpression).

Returns: Value in the best solution.

See Also: LSSolution::getCollectionValue(LSExpression)

Since: 5.5

void localsolver::LSExpression::setName ( const std::string & name )

inline

Sets the name of this expression.

Only allowed in state S_Modeling. The name cannot be empty. Two operators of the model cannot share the same name. Useful for debugging or logging purposes.

Parameters

name Name.

bool localsolver::LSExpression::isNamed ( ) const

inline

Returns true if this expression has a name, and false otherwise.

Returns: True if named.

const std::string localsolver::LSExpression::getName ( ) const

inline

Gets the name of this expression or the empty string if no name has been set.

Returns: Name.

std::string localsolver::LSExpression::toString ( ) const

inline

Returns a string representation of this expression.

This representation provides the index of the expression, its type, and its name (if any). Useful for debugging or logging purposes.

Returns: String representation.

std::string localsolver::LSExpression::getInfo ( ) const

inline

Returns useful info about this expression (according to the state of LocalSolver).

Useful for debugging or logging purposes.

Returns: Info about this search during the solving process.

Detailed Description

Public Member Functions

Member Function Documentation