.. index:: halstead_metric(Stroud) .. _halstead_metric/1:

.. rst-class:: right

object

halstead_metric(Stroud)

• Stroud - Coefficient for computing the time required to program. Computes Halstead complexity numbers for an entity.

  | Availability: | logtalk_load(code_metrics(loader))

  | Author: Paulo Moura | Version: 0:9:0 | Date: 2024-03-27

  | Compilation flags: | static, context_switching_calls

  | Imports: | public :ref:`code_metrics_utilities <code_metrics_utilities/0>` | public :ref:`code_metric <code_metric/0>` | Uses: | :ref:`list <list/0>` | :ref:`numberlist <numberlist/0>` | :ref:`pairs <pairs/0>`

  | Remarks:

  • Definition of operators: Predicates declared, user-defined, and called are interpreted as operators. Built-in predicates and built-in control constructs are ignored.
  • Definition of operands: Predicate arguments are abstracted and interpreted as operands. Note that this definition of operands is a significant deviation from the original definition, which used syntactic literals.
  • Pn: Number of distinct predicates (declared, defined, called, or updated).
  • PAn: Number of predicate arguments (assumed distinct).
  • Cn: Number of predicate calls/updates + number of clauses.
  • CAn: Number of predicate call/update arguments + number of clause head arguments.
  • EV: Entity vocabulary: EV = Pn + PAn.
  • EL: Entity length: EL = Cn + CAn.
  • V: Volume: V = EL * log2(EV).
  • D: Difficulty: D = (Pn/2) * (CAn/An).
  • E: Effort: E = D * V.
  • T: Time required to program: T = E/k seconds (k is the Stroud number; defaults to 18).
  • B: Number of delivered bugs: B = V/3000.
  • Entity score: Represented as the compound term pn_pan_cn_can_ev_el_v_d_e_t_b/11.

  | Inherited public predicates: |  :ref:`code_metric/0::all/0`  :ref:`code_metric/0::all/1`  :ref:`code_metric/0::all_score/1`  :ref:`options_protocol/0::check_option/1`  :ref:`options_protocol/0::check_options/1`  :ref:`options_protocol/0::default_option/1`  :ref:`options_protocol/0::default_options/1`  :ref:`code_metric/0::directory/1`  :ref:`code_metric/0::directory/2`  :ref:`code_metric/0::directory_score/2`  :ref:`code_metric/0::entity/1`  :ref:`code_metric/0::entity_score/2`  :ref:`code_metric/0::file/1`  :ref:`code_metric/0::file/2`  :ref:`code_metric/0::file_score/2`  :ref:`code_metric/0::format_entity_score//2`  :ref:`code_metric/0::library/1`  :ref:`code_metric/0::library/2`  :ref:`code_metric/0::library_score/2`  :ref:`options_protocol/0::option/2`  :ref:`options_protocol/0::option/3`  :ref:`code_metric/0::rdirectory/1`  :ref:`code_metric/0::rdirectory/2`  :ref:`code_metric/0::rdirectory_score/2`  :ref:`code_metric/0::rlibrary/1`  :ref:`code_metric/0::rlibrary/2`  :ref:`code_metric/0::rlibrary_score/2`  :ref:`options_protocol/0::valid_option/1`  :ref:`options_protocol/0::valid_options/1`  

  .. 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)