
current_macro(-TermClass, -TransPred, -Options, -Module)

   Succeeds if TermClass is a macro with the transformation predicate
TransPred defined in module Module and flags Options.



Arguments
   TermClass           Term in the form Atom/Integer or atom or variable.
   TransPred           Term in the form Atom/Integer or variable.
   Options             List or a variable.
   Module              Atom or variable.

Type
   Syntax Settings

Description
   This predicate enumerates all visible macros and retrieves their
   definition.  The arguments TransPred and Options correspond to the
   arguments of macro/3 or portray/3.  Module is the definition module of
   TransPred and it can be used for calling the TransPred explicitly (e.g.
   using :/2).




Modes and Determinism
   current_macro(-, -, -, -) is nondet

Modules
   This predicate is sensitive to its module context (tool predicate, see @/2).

Exceptions
     5 --- TermClass not of form Atom/Integer.
     5 --- TransPred not of form Atom/Integer.
     5 --- Options not a list.

Examples
   
[eclipse]: [user].             % define a macro
 tr_a(a(X), b(X,X)).
 :- local macro(a/1, tr_a/2, []).

yes.
[eclipse]: current_macro(F, T, O, M).  % list visible macros

F = (-->) / 2                  % predefined macro
T = trdcg / 3
O = [global, clause]
M = macro     More? (;)

F = (if) / 2                   % predefined macro
T = tr_if / 2
O = [global, clause]
M = coroutine     More? (;)

F = a / 1                      % our user defined macro
T = tr_a / 2
O = [local]
M = eclipse     More? (;)

F = no_macro_expansion / 1     % predefined macro
T = trprotect / 2
O = [global, protect_arg]
M = macro     More? (;)

no (more) solution.





See Also
   macro / 3, portray / 3, erase_macro / 2
