LocalSolver 12.0¶

Release notes

Introduction of a new interval decision and its related operators start, end, length and contains.
Introduction in LSP of the geodata module for fast computation of distance and time matrices.
New exclusive range operator m...n in LSP to create ranges from m (inclusive) to n (exclusive).
New pragma modelingset statement in LSP to freeze the modeling operators to a particular version of LocalSolver.
LocalSolver extends its lexicographic multiobjective capability to external functions with surrogate modeling.
The Linux arm64 build is now available.

New modeling operators¶

Interval¶

Interval decision variable. Operator with two integer constant operands that represent the min start and the max end of the decision. Intervals greatly simplify the modeling of scheduling problems.

Start¶

The start of a non-void interval. This operator takes exactly one argument of type interval and returns an integer.

End¶

The end of a non-void interval. This operator takes exactly one argument of type interval and returns an integer.

Length¶

The length of a non-void interval. This operator takes exactly one argument of type interval and returns an integer. The length of an interval is equivalent to end(interval) - start(interval). It differs from the count on void intervals since the length of a void interval is undefined whereas the count of a void interval is 0.

API Changes¶

Python¶

Added LSOperator.INTERVAL, LSOperator.START, LSOperator.END and LSOperator.LENGTH operators.
Added LSModel.interval(), LSModel.start(), LSModel.end() and LSModel.length() to create interval, start, end and length expressions respectively.
Added a new class LSInterval that holds an interval value. Instances of this class are returned by LSSolution.get_value() or LSExpression.value.
Added a new method LSExpression.is_interval() to test if an expression is a range or an interval.

C++¶

Added O_Interval, O_Start, O_End and O_Length operators.
Added LSModel::intervalVar(), LSModel::start(), LSModel::end() and LSModel::length() to create interval, start, end and length expressions respectively.
Added a new class LSInterval that holds an interval value.
Added new methods LSSolution::getIntervalValue(), LSExpression::getIntervalValue(), LSExpression::setIntervalValue() and LSSolution::setIntervalValue() to retrieve or set the value of intervals and ranges in the current solution.
Added a new method LSExpression::isInterval() to test if an expression is a range or an interval.

C#¶

Added LSOperator.Interval, LSOperator.Start, LSOperator.End and LSOperator.Length operators.
Added LSModel.Interval, LSModel.Start, LSModel.End and LSModel.Length to create interval, start, end and length expressions respectively.
Added a new class LSInterval that holds an interval value.
Added new methods LSSolution.GetIntervalValue, LSExpression.GetIntervalValue, LSExpression.SetIntervalValue and LSSolution.SetIntervalValue to retrieve or set the value of intervals and ranges in the current solution.
Added a new method LSExpression.IsInterval to test if an expression is a range or an interval.

Java¶

Added LSOperator.Interval, LSOperator.Start, LSOperator.End and LSOperator.Length operators.
Added LSModel.interval, LSModel.start, LSModel.end and LSModel.length to create interval, start, end and length expressions respectively.
Added a new class LSInterval that holds an interval value.
Added new methods LSSolution.getIntervalValue, LSExpression.getIntervalValue, LSExpression.setIntervalValue and LSSolution.setIntervalValue to retrieve or set the value of intervals and ranges in the current solution.
Added a new method LSExpression.isInterval to test if an expression is a range or an interval.