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By default, check()/eval() constraints do not support calling arbitrary Java methods, since they are generally assumed to be impure. However, if you have a pure method and want to call it in these types of constraints, you have two options:
- if it is implemented by you, annotate it with the @Pure annotation of Xbase (org.eclipse.xtext.xbase.lib.Pure)
- if it comes from a third-party library, register it via the org.eclipse.viatra.query.patternlanguage.purewhitelist extension point
Some standard library methods are marked as pure by default, including: