.. 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

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.. rst-class:: align-right

built-in predicate

.. index:: pair: set_logtalk_flag/2; Built-in predicate .. _predicates_set_logtalk_flag_2:

set_logtalk_flag/2

Description

::

set_logtalk_flag(Flag, Value)

Sets global, default, flag values. For local flag scope, use the corresponding :ref:directives_set_logtalk_flag_2 directive. To set a global flag value when compiling and loading a source file, wrap the calls to this built-in predicate with an :ref:directives_initialization_1 directive. For a description of the predefined compiler flags, please see the :ref:programming_flags section in the User Manual.

Modes and number of proofs

::

set_logtalk_flag(+atom, +nonvar) - one

Errors

| Flag is a variable: | instantiation_error | Value is a variable: | instantiation_error | Flag is neither a variable nor an atom: | type_error(atom, Flag) | Flag is an atom but an invalid flag: | domain_error(flag, Flag) | Value is not a valid value for flag Flag: | domain_error(flag_value, Flag + Value) | Flag is a read-only flag: | permission_error(modify, flag, Flag)

Examples

::

% turn off globally and by default the compiler % unknown entities warnings: | ?- set_logtalk_flag(unknown_entities, silent).

.. seealso::

:ref:predicates_create_logtalk_flag_3, :ref:predicates_current_logtalk_flag_2