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We're excited to share that we are moving forward. We're leaving behind the LocalSolver brand and transitioning to our new identity: Hexaly. This represents a leap forward in our mission to enable every organization to make better decisions faster when faced with operational and strategic challenges.

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This page is for an old version of Hexaly Optimizer. We recommend that you update your version and read the documentation for the latest stable release.

LSBBNativeFunction Interface

delegate double localsolverblackbox.LSBBNativeFunction(LSBBNativeContext context)

Native function delegate. To connect your blackbox function with LocalSolverBlackBox, you have to proceed in 3 steps:

  1. Implement the delegate in a method. The method must take the native context and must return a double value. This native context contains the values of the expressions passed to the function. A distinction is made between integer arguments (bool, int) and floating point arguments (double).
  2. Instanciate the function as an LSBBExpression with LSBBModel.CreateNativeFunction.
  3. Pass arguments to your function and call it. For that, you have to create expressions of type LSBBOperator.Call. The first operand must be your native function. The other operands must be LSExpressions decisions. Their value will be made accessible to your native function through the native context.

Note: Most of the time your native function will be called when the solver is in state LSBBState.Running. Do not attempt to call any method of the solver (to retrieve statistics, values of LSExpressions or whatever) in that state or an exception will be thrown. The only accessible function is LocalSolverBlackBox.Stop.