object

print_goal_hook

Use this object to easily print entity predicate goals before, after, or before and after calling them.

Availability:

logtalk_load(hook_objects(loader))

Author: Paulo Moura

Version: 1:0:0

Date: 2020-03-14

Compilation flags:

static, context_switching_calls

Implements:

public expanding

Remarks:

• Usage: Mark a goal to be printed by prefixing it with an operator. Printing uses a comment message.

• To print goal before calling it: - Goal.

• To print goal after calling it: + Goal.

• To print goal before and after calling it: * Goal.

• Operators: This hook object uses the standard - and + prefix operators and also defines a global * prefix operator with the same type and priority.

Inherited public predicates:

 goal_expansion/2  term_expansion/2

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)

See also

backend_adapter_hook, default_workflow_hook, grammar_rules_hook, identity_hook, prolog_module_hook(Module), object_wrapper_hook, write_to_stream_hook(Stream,Options), write_to_stream_hook(Stream), suppress_goal_hook