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6.7.7 Procedure Properties and Meta-information

   In addition to the information that is strictly necessary to run, procedures may
   have other associated information. For example, the name of a procedure is
   information not for the procedure, but about the procedure. This meta-information
   can be accessed via the procedure properties interface.

   The first group of procedures in this meta-interface are predicates to test
   whether a Scheme object is a procedure, or a special procedure, respectively.
   procedure? is the most general predicates, it returns #t for any kind of
   procedure.

   Scheme Procedure: procedure? obj[12] ¶
   C Function: scm_procedure_p (obj)[13] ¶
          Return #t if obj is a procedure.

   Scheme Procedure: thunk? obj[14] ¶
   C Function: scm_thunk_p (obj)[15] ¶
          Return #t if obj is a procedure that can be called with zero arguments.

   Procedure properties are general properties associated with procedures. These can
   be the name of a procedure or other relevant information, such as debug hints.

   Scheme Procedure: procedure-name proc[16] ¶
   C Function: scm_procedure_name (proc)[17] ¶
          Return the name of the procedure proc

   Scheme Procedure: procedure-source proc[18] ¶
   C Function: scm_procedure_source (proc)[19] ¶
          Return the source of the procedure proc. Returns #f if the source code is
          not available.

   Scheme Procedure: procedure-properties proc[20] ¶
   C Function: scm_procedure_properties (proc)[21] ¶
          Return the properties associated with proc, as an association list.

   Scheme Procedure: procedure-property proc key[22] ¶
   C Function: scm_procedure_property (proc, key)[23] ¶
          Return the property of proc with name key.

   Scheme Procedure: set-procedure-properties! proc alist[24] ¶
   C Function: scm_set_procedure_properties_x (proc, alist)[25] ¶
          Set proc's property list to alist.

   Scheme Procedure: set-procedure-property! proc key value[26] ¶
   C Function: scm_set_procedure_property_x (proc, key, value)[27] ¶
          In proc's property list, set the property named key to value.

   Documentation for a procedure can be accessed with the procedure
   procedure-documentation.

   Scheme Procedure: procedure-documentation proc[28] ¶
   C Function: scm_procedure_documentation (proc)[29] ¶
          Return the documentation string associated with proc. By convention, if a
          procedure contains more than one expression and the first expression is a
          string constant, that string is assumed to contain documentation for that
          procedure.
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   [32]Procedures   [[33]Contents][[34]Index]

References

   1. http://www.gnu.org/software/guile/manual/html_node/index.html
   2. http://www.gnu.org/software/guile/manual/html_node/Concept-Index.html
   3. http://www.gnu.org/software/guile/manual/html_node/index.html#SEC_Contents
   4. http://www.gnu.org/software/guile/manual/html_node/Procedures.html
   5. http://www.gnu.org/software/guile/manual/html_node/Procedures-with-Setters.html
   6. http://www.gnu.org/software/guile/manual/html_node/Higher_002dOrder-Functions.html
   7. http://www.gnu.org/software/guile/manual/html_node/Procedures-with-Setters.html
   8. http://www.gnu.org/software/guile/manual/html_node/Higher_002dOrder-Functions.html
   9. http://www.gnu.org/software/guile/manual/html_node/Procedures.html
  10. http://www.gnu.org/software/guile/manual/html_node/index.html#SEC_Contents
  11. http://www.gnu.org/software/guile/manual/html_node/Concept-Index.html
  12. http://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html#index-procedure_003f
  13. http://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html#index-scm_005fprocedure_005fp
  14. http://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html#index-thunk_003f
  15. http://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html#index-scm_005fthunk_005fp
  16. http://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html#index-procedure_002dname
  17. http://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html#index-scm_005fprocedure_005fname
  18. http://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html#index-procedure_002dsource
  19. http://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html#index-scm_005fprocedure_005fsource
  20. http://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html#index-procedure_002dproperties
  21. http://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html#index-scm_005fprocedure_005fproperties
  22. http://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html#index-procedure_002dproperty
  23. http://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html#index-scm_005fprocedure_005fproperty
  24. http://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html#index-set_002dprocedure_002dproperties_0021
  25. http://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html#index-scm_005fset_005fprocedure_005fproperties_005fx
  26. http://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html#index-set_002dprocedure_002dproperty_0021
  27. http://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html#index-scm_005fset_005fprocedure_005fproperty_005fx
  28. http://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html#index-procedure_002ddocumentation
  29. http://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html#index-scm_005fprocedure_005fdocumentation
  30. http://www.gnu.org/software/guile/manual/html_node/Procedures-with-Setters.html
  31. http://www.gnu.org/software/guile/manual/html_node/Higher_002dOrder-Functions.html
  32. http://www.gnu.org/software/guile/manual/html_node/Procedures.html
  33. http://www.gnu.org/software/guile/manual/html_node/index.html#SEC_Contents
  34. http://www.gnu.org/software/guile/manual/html_node/Concept-Index.html