Did you know ... | Search Documentation: |
![]() | Pack logtalk -- logtalk-3.81.0/manuals/_sources/refman/directives/mode_2.rst.txt |
.. This file is part of Logtalk https://logtalk.org/ SPDX-FileCopyrightText: 1998-2024 Paulo Moura <pmoura@logtalk.org> SPDX-License-Identifier: Apache-2.0
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
.. rst-class:: align-right
directive
.. index:: pair: mode/2; Directive .. _directives_mode_2:
::
mode(Mode, NumberOfProofs)
Most predicates can be used with several instantiations modes. This directive enables the specification of each :ref:`instantiation mode <predicates_mode_instantiation>` and the corresponding :ref:`number of proofs <predicates_mode_number_of_proofs>` (but not necessarily distinct solutions). The instantiation mode of each argument can include type information. You may also use this directive for documenting grammar rule non-terminals.
::
mode(+predicate_mode_term, +number_of_proofs)
mode(+non_terminal_mode_term, +number_of_proofs)
::
:- mode(atom_concat(-atom, -atom, +atom), one_or_more)
.
:- mode(atom_concat(+atom, +atom, -atom), one)
.
:- mode(var(@term), zero_or_one)
.
:- mode(solve(+callable, -list(atom)), zero_or_one)
.
.. seealso::
:ref:directives_info_2
,
:ref:methods_predicate_property_2