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inserta(+Key, +Struct, +Old, -New)

Insert Struct into a sorted list
Key
Key argument position (non-negative integer, or list of those)
Struct
Structure
Old
Ordered list of structures
New
Ordered list of structures, or variable

Description

Inserts the compound term Struct into the ordered list Old, giving New. The lists are both in ascending order (according to their elements' Key'th argument), and may contain duplicates. If Old already contains elements with the same key as Struct, then Struct is inserted before those.

The list New is always one element longer than the list Old.

Modes and Determinism

Exceptions

(4) instantiation fault
Arguments are insufficiently instantiated
(5) type error
Some argument or its components are of the wrong type
(6) out of range
Some structure does not have a Key'th argument

Examples

    ?- inserta(1, f(2,new), [f(1,a),f(2,b),f(2,c),f(3,d)], New).
    New = [f(1,a), f(2,new), f(2,b), f(2,c), f(3,d)]
    Yes (0.00s cpu)

See Also

merge / 5, sort / 4