.. index:: single: head_arguments_mutation(Entity,Predicate,ClauseIndex,Occurrence,PrintMutation) .. _head_arguments_mutation/5:

.. rst-class:: right

object

head_arguments_mutation(Entity,Predicate,ClauseIndex,Occurrence,PrintMutation)

• Entity - Identifier of the entity being mutated.
• Predicate - Predicate or non-terminal indicator selecting clauses to mutate.
• ClauseIndex - 1-based clause index for the selected mutation (equal to Occurrence for this mutator).
• Occurrence - 1-based mutation occurrence index selecting one compile-time bound head argument to mutate.
• PrintMutation - Boolean flag to print the original and mutated term plus source location. Hook object implementing the head_arguments_mutation mutator by mutating one compile-time bound predicate/non-terminal head argument using the type::mutation/3 predicate.

  | Availability: | logtalk_load(mutation_testing(loader))

  | Author: Paulo Moura | Version: 1:0:0 | Date: 2026-03-20

  | Compilation flags: | static, context_switching_calls

  | Implements: | public :ref:`expanding <expanding/0>` | public :ref:`clause_mutator_protocol <clause_mutator_protocol/0>` | Imports: | public :ref:`mutator_common <mutator_common/0>` | Uses: | :ref:`type <type/0>`

  | Remarks: | (none)

  | Inherited public predicates: |  :ref:`mutator_protocol/0::coverage_clause_mutator/0`  :ref:`expanding/0::goal_expansion/2`  :ref:`mutator_protocol/0::mutation/2`  :ref:`mutator_protocol/0::reset/0`  :ref:`expanding/0::term_expansion/2`  

  .. contents:: :local: :backlinks: top

Public predicates

(no local declarations; see entity ancestors if any)

Protected predicates

(no local declarations; see entity ancestors if any)

Private predicates

(no local declarations; see entity ancestors if any)

Operators

(none)