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## org.optaplanner.core.api.domain.solution.cloner
Interface SolutionCloner<SolutionG extends Solution>

All Known Subinterfaces:
  PlanningSolution.NullSolutionCloner

All Known Implementing Classes:
  FieldAccessingSolutionCloner, PlanningCloneableSolutionCloner

    public interface SolutionCloner<SolutionG extends Solution>

Clones a `Solution` during planning. Used to remember the state of a good `Solution` so it can be recalled at a later then when the original `Solution` is already modified. Also used in population based heuristics to increase or repopulate the population.

Planning cloning is hard: avoid doing it yourself.

Method Summary
`SolutionG` | `cloneSolution(SolutionG original)` Does a planning clone.

Method Detail

### cloneSolution

    SolutionG cloneSolution(SolutionG original)

  Does a planning clone. The returned `Solution` clone must fulfill these requirements:
  - The clone must represent the same planning problem. Usually it reuses the same instances of the problem facts and problem fact collections as the `original`.
  - The clone must use different, cloned instances of the entities and entity collections. If a cloned entity changes, the original must remain unchanged. If an entity is added or removed in a cloned `Solution`, the original `Solution` must remain unchanged.
  Note that a class might support more than 1 clone method: planning clone is just one of them.

  Parameters:
    `original` - never null, the original `Solution`
  Returns:
    never null, the cloned `Solution`

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