SWI-Prolog -- dicts_to_same

Documentation
- Reference manual
  - The SWI-Prolog library
    - library(dicts): Dict utilities
- Packages

Availability::- use_module(library(dicts)).(can be autoloaded)

dicts_to_same_keys(+DictsIn, :OnEmpty, -DictsOut)

DictsOut is a copy of DictsIn, where each dict contains all keys appearing in all dicts of DictsIn. Values for keys that are added to a dict are produced by calling OnEmpty as below. The predicate dict_fill/4 provides an implementation that fills all new cells with a predefined value.

call(:OnEmpty, +Key, +Dict, -Value)