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.. index:: varlistp .. _varlistp/0:
.. rst-class:: right
protocol
varlistp
List of variables protocol.
| Availability:
| logtalk_load(types(loader))
| Author: Paulo Moura | Version: 1:3:0 | Date: 2022-09-19
| Compilation flags:
| static
| Dependencies: | (none)
| Remarks: | (none)
| Inherited public predicates: | (none)
.. contents:: :local: :backlinks: top
Public predicates
.. index:: append/3 .. _varlistp/0::append/3:
append/3 ^^^^^^^^^^^^
Appends two lists.
| Compilation flags:
| static
| Template:
| append(List1,List2,List)
| Mode and number of proofs:
| append(?list,?list,?list) - zero_or_more
.. index:: delete/3 .. _varlistp/0::delete/3:
delete/3 ^^^^^^^^^^^^
Deletes from a list all occurrences of an element returning the list of remaining elements.
| Compilation flags:
| static
| Template:
| delete(List,Element,Remaining)
| Mode and number of proofs:
| delete(@list,@term,?list) - one
.. index:: empty/1 .. _varlistp/0::empty/1:
empty/1 ^^^^^^^^^^^
True if the argument is an empty list.
| Compilation flags:
| static
| Template:
| empty(List)
| Mode and number of proofs:
| empty(@list) - zero_or_one
.. index:: flatten/2 .. _varlistp/0::flatten/2:
flatten/2 ^^^^^^^^^^^^^
Flattens a list of lists into a list.
| Compilation flags:
| static
| Template:
| flatten(List,Flatted)
| Mode and number of proofs:
| flatten(@list,-list) - one
.. index:: last/2 .. _varlistp/0::last/2:
last/2 ^^^^^^^^^^
List last element (if it exists).
| Compilation flags:
| static
| Template:
| last(List,Last)
| Mode and number of proofs:
| last(@list,@var) - zero_or_one
.. index:: length/2 .. _varlistp/0::length/2:
length/2 ^^^^^^^^^^^^
List length.
| Compilation flags:
| static
| Template:
| length(List,Length)
| Mode and number of proofs:
| length(@list,?integer) - zero_or_one
.. index:: memberchk/2 .. _varlistp/0::memberchk/2:
memberchk/2 ^^^^^^^^^^^^^^^
Checks if a variable is a member of a list.
| Compilation flags:
| static
| Template:
| memberchk(Element,List)
| Mode and number of proofs:
| memberchk(@var,@list) - zero_or_one
.. index:: nextto/3 .. _varlistp/0::nextto/3:
nextto/3 ^^^^^^^^^^^^
X and Y are consecutive elements in List.
| Compilation flags:
| static
| Template:
| nextto(X,Y,List)
| Mode and number of proofs:
| nextto(@var,@var,?list) - zero_or_more
.. index:: nth0/3 .. _varlistp/0::nth0/3:
nth0/3 ^^^^^^^^^^
Nth element of a list (counting from zero).
| Compilation flags:
| static
| Template:
| nth0(Nth,List,Element)
| Mode and number of proofs:
| nth0(?integer,+list,@var) - zero_or_more
.. index:: nth0/4 .. _varlistp/0::nth0/4:
nth0/4 ^^^^^^^^^^
Nth element of a list (counting from zero). Rest is a list of all the other elements. Can be used to either select the nth element of List or to insert an element before the nth element in Rest.
| Compilation flags:
| static
| Template:
| nth0(Nth,List,Element,Rest)
| Mode and number of proofs:
| nth0(?integer,+list,@var,?list) - zero_or_more
.. index:: nth1/3 .. _varlistp/0::nth1/3:
nth1/3 ^^^^^^^^^^
Nth element of a list (counting from one).
| Compilation flags:
| static
| Template:
| nth1(Nth,List,Element)
| Mode and number of proofs:
| nth1(?integer,+list,@var) - zero_or_more
.. index:: nth1/4 .. _varlistp/0::nth1/4:
nth1/4 ^^^^^^^^^^
Nth element of a list (counting from zero). Rest is a list of all the other elements. Can be used to either select the nth element of List or to insert an element before the nth element in Rest.
| Compilation flags:
| static
| Template:
| nth1(Nth,List,Element,Rest)
| Mode and number of proofs:
| nth1(?integer,+list,@var,?list) - zero_or_more
.. index:: permutation/2 .. _varlistp/0::permutation/2:
permutation/2 ^^^^^^^^^^^^^^^^^
The two lists are a permutation of the same list.
| Compilation flags:
| static
| Template:
| permutation(List,Permutation)
| Mode and number of proofs:
| permutation(@list,@list) - zero_or_one
.. index:: prefix/2 .. _varlistp/0::prefix/2:
prefix/2 ^^^^^^^^^^^^
Prefix is a prefix of List.
| Compilation flags:
| static
| Template:
| prefix(Prefix,List)
| Mode and number of proofs:
| prefix(?list,@list) - zero_or_more
.. index:: remove_duplicates/2 .. _varlistp/0::remove_duplicates/2:
remove_duplicates/2 ^^^^^^^^^^^^^^^^^^^^^^^
Removes duplicated variables and keeping the left-most variable when repeated.
| Compilation flags:
| static
| Template:
| remove_duplicates(List,Set)
| Mode and number of proofs:
| remove_duplicates(+list,-list) - one
.. index:: reverse/2 .. _varlistp/0::reverse/2:
reverse/2 ^^^^^^^^^^^^^
Reverses a list.
| Compilation flags:
| static
| Template:
| reverse(List,Reversed)
| Mode and number of proofs:
| reverse(@list,?list) - zero_or_one
| reverse(?list,@list) - zero_or_one
| reverse(-list,-list) - one_or_more
.. index:: same_length/2 .. _varlistp/0::same_length/2:
same_length/2 ^^^^^^^^^^^^^^^^^
The two lists have the same length.
| Compilation flags:
| static
| Template:
| same_length(List1,List2)
| Mode and number of proofs:
| same_length(@list,?list) - zero_or_one
| same_length(?list,@list) - zero_or_one
| same_length(-list,-list) - one_or_more
.. index:: select/3 .. _varlistp/0::select/3:
select/3 ^^^^^^^^^^^^
Selects an element from a list, returning the list of remaining elements.
| Compilation flags:
| static
| Template:
| select(Element,List,Remaining)
| Mode and number of proofs:
| select(@var,?list,?list) - zero_or_more
.. index:: sublist/2 .. _varlistp/0::sublist/2:
sublist/2 ^^^^^^^^^^^^^
The first list is a sublist of the second.
| Compilation flags:
| static
| Template:
| sublist(Sublist,List)
| Mode and number of proofs:
| sublist(?list,@list) - zero_or_more
.. index:: subtract/3 .. _varlistp/0::subtract/3:
subtract/3 ^^^^^^^^^^^^^^
Removes all elements in the second list from the first list, returning the list of remaining elements.
| Compilation flags:
| static
| Template:
| subtract(List,Elements,Remaining)
| Mode and number of proofs:
| subtract(@list,@list,-list) - one
.. index:: suffix/2 .. _varlistp/0::suffix/2:
suffix/2 ^^^^^^^^^^^^
Suffix is a suffix of List.
| Compilation flags:
| static
| Template:
| suffix(Suffix,List)
| Mode and number of proofs:
| suffix(?list,@list) - zero_or_more
.. index:: valid/1 .. _varlistp/0::valid/1:
valid/1 ^^^^^^^^^^^
Term is a valid list of variables.
| Compilation flags:
| static
| Template:
| valid(Term)
| Mode and number of proofs:
| valid(@nonvar) - zero_or_one
.. index:: check/1 .. _varlistp/0::check/1:
check/1 ^^^^^^^^^^^
Checks if a term is a valid list of variables. Throws an exception if the term is not valid.
| Compilation flags:
| static
| Template:
| check(Term)
| Mode and number of proofs:
| check(@nonvar) - one
Protected predicates
(none)
Private predicates
(none)
Operators
(none)
.. seealso::
:ref:`varlist <varlist/0>`, :ref:`listp <listp/0>`, :ref:`numberlistp <numberlistp/0>`