.. 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

built-in method

.. index:: pair: context/1; Built-in method .. _methods_context_1:

context/1

Description

::

context(Context)

Returns the execution context for a predicate clause using the term logtalk(Head,ExecutionContext) where Head is the head of the clause containing the call. This private predicate is mainly used for providing an error context when type-checking predicate arguments. The ExecutionContext term should be regarded as an opaque term, which can be decoded using the :ref:`logtalk::execution_context/7 apis:logtalk/0::execution_context/7` predicate. Calls to this predicate are inlined at compilation time.

Modes and number of proofs

::

context(--callable) - one

Errors

(none)

Examples

::

foo(A, N) :- % type-check arguments context(Context), type::check(atom, A, Context), type::check(integer, N, Context), % arguments are fine; go ahead ... .

.. seealso::

:ref:methods_parameter_2, :ref:methods_self_1, :ref:methods_sender_1, :ref:methods_this_1