# operator_type (3) - Linux Manuals

## NAME

QuantLib::BoundaryCondition - Abstract boundary condition class for finite difference problems.

## SYNOPSIS

#include <ql/methods/finitedifferences/boundarycondition.hpp>

### Public Types

enum Side { None, Upper, Lower }

typedef Operator operator_type

typedef Operator::array_type array_type

### Public Member Functions

virtual void applyBeforeApplying (operator_type &) const =0

virtual void applyAfterApplying (array_type &) const =0

virtual void applyBeforeSolving (operator_type &, array_type &rhs) const =0

virtual void applyAfterSolving (array_type &) const =0

virtual void setTime (Time t)=0

## Detailed Description

### template<class Operator> class QuantLib::BoundaryCondition< Operator >

Abstract boundary condition class for finite difference problems.

## Member Enumeration Documentation

### enum Side

Possible enhancements

Generalize for n-dimensional conditions

## Member Function Documentation

### virtual void applyBeforeApplying (operator_type &) const [pure virtual]

This method modifies an operator \$ L \$ before it is applied to an array \$ u \$ so that \$ v = Lu \$ will satisfy the given condition.

Implemented in NeumannBC, and DirichletBC.

### virtual void applyAfterApplying (array_type &) const [pure virtual]

This method modifies an array \$ u \$ so that it satisfies the given condition.

Implemented in NeumannBC, and DirichletBC.

### virtual void applyBeforeSolving (operator_type &, array_type & rhs) const [pure virtual]

This method modifies an operator \$ L \$ before the linear system \$ Lu' = u \$ is solved so that \$ u' \$ will satisfy the given condition.

Implemented in NeumannBC, and DirichletBC.

### virtual void applyAfterSolving (array_type &) const [pure virtual]

This method modifies an array \$ u \$ so that it satisfies the given condition.

Implemented in NeumannBC, and DirichletBC.

### virtual void setTime (Time t) [pure virtual]

This method sets the current time for time-dependent boundary conditions.

Implemented in NeumannBC, and DirichletBC.

## Author

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