Definition

MixedIntegerProgramVariable is a concept of a variable in a Mixed Integer Programming (MIP) problem.

Types
enum	Variable_type { CONTINUOUS , INTEGER , BINARY }
	A variable can be continuous, integer, or binary. More...

typedef unspecified_type	FT

Creation
	MixedIntegerProgramVariable (MixedIntegerProgramTraits *solver, Variable_type type, FT lb=, FT ub, const std::string &name, int idx)
	Constructs a variable initialized with the pointer of the solver it belongs to, the variable type, lower bound, upper bound, name, and index.

Operations
Variable_type	variable_type () const
	Returns the variable type.

void	set_variable_type (Variable_type t)
	Sets/Changes the variable type.

const std::string &	name () const
	Returns the name of the variable.

void	set_name (const std::string &n)
	Sets the name of the variable.

int	index () const
	Returns the index of the variable.

void	set_index (int idx)
	Sets the index of the variable.

const MixedIntegerProgramTraits *	solver () const
	Returns the solver that owns this variable.

MixedIntegerProgramTraits *	solver ()

void	set_lower_bound (FT lb)
	Sets the lower bound.

void	set_upper_bound (FT ub)
	Sets the upper bound.

void	set_bounds (FT lb, FT ub)
	Sets both lower and upper bounds.

FT	lower_bound () const
	Gets the lower bound.

FT	upper_bound () const
	Gets the upper bound.

void	get_bounds (FT &lb, FT &ub) const
	Gets both lower and upper bounds.

FT	solution_value (bool rounded=false) const
	Returns the value of the variable in the current solution.

void	set_solution_value (FT value)
	Sets the solution value (should be called internally by the solver).

static FT	infinity ()
	Gets the infinity threshold (e.g., 1e20).

Member Enumeration Documentation

A variable can be continuous, integer, or binary.

static FT MixedIntegerProgramVariable::infinity ( )

static

Gets the infinity threshold (e.g., 1e20).

Values greater than this value are considered as infinity.

FT MixedIntegerProgramVariable::solution_value ( bool rounded = false ) const

Returns the value of the variable in the current solution.

Note: (1) Valid only if the program was successfully solved. (2) If the variable is integer and rounded == true, then the value will be rounded to the nearest integer.