= Macro entity =

Preprocessor macro directives can be queried using the macro entity.

== Initial selector == 
* {{{@macro}}}: this selector can be used to start a query with the currently selected macro.

== Selectors == 

''In parentheses you find the type of the result elements.''

* {{{refs}}} (''expression''): returns every expression that refers to the given macro with the form {{{?Macro...}}}.
* {{{file}}} (''file''): returns the file entity that the macro is defined in.

== Properties == 

Macro entities have the following properties:
* {{{name}}} (''atom, string''): returns the identifier of the macro.
* {{{arity}}} (''int''): returns the arity of a given parametric macro. In case of a constant macro the arity is 0.
* {{{const}}} (''bool''): returns true if the given macro is a constant. Note, that there are parametric macros with no parameters, they are treated as non-constant macros.