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# <ConsistencyModule:> inverse_g(+Succ,+Pred)

Constrains elements of Succ to be the successors and Pred to be the predecessors of nodes in a digraph, using native Gecode indexing.
*Succ*
- A collection of N different (domain) variables or integers
*Pred*
- A collection of N different (domain) variables or integers

## Description

This version of inverse/2 uses the native Gecode indexing, which starts
from 0, i.e. the first elements in Succ and Pred has position 0. This is
different from normal ECLiPSe's indexing, which starts from 1.
This predicate maps more directly to Gecode's native implementation of
the constraint, without the conversion between Gecode and ECLiPSe
indexing of inverse/2. It may therefore be more efficient, but could also
be incompatible with existing ECLiPSe code.

See inverse/2 for a more detailed description of this predicate.

## See Also

inverse / 2