3.1 Defmacro

Defmacros are supported by all implementations.

Function: gentemp ¶

Returns a new (interned) symbol each time it is called. The symbol names are implementation-dependent

(gentemp) ⇒ scm:G0
(gentemp) ⇒ scm:G1

Function: defmacro:eval e ¶

Returns the slib:eval of expanding all defmacros in scheme expression e.

Function: defmacro:load filename ¶

filename should be a string. If filename names an existing file, the defmacro:load procedure reads Scheme source code expressions and definitions from the file and evaluates them sequentially. These source code expressions and definitions may contain defmacro definitions. The defmacro:load procedure does not affect the values returned by current-input-port, current-error-port, and current-output-port.

Function: defmacro? sym ¶

Returns #t if sym has been defined by defmacro, #f otherwise.

Function: macroexpand-1 form ¶

Function: macroexpand form ¶

If form is a macro call, macroexpand-1 will expand the macro call once and return it. A form is considered to be a macro call only if it is a cons whose car is a symbol for which a defmacro has been defined.

macroexpand is similar to macroexpand-1, but repeatedly expands form until it is no longer a macro call.

Macro: defmacro name lambda-list form … ¶

When encountered by defmacro:eval, defmacro:macroexpand*, or defmacro:load defines a new macro which will henceforth be expanded when encountered by defmacro:eval, defmacro:macroexpand*, or defmacro:load.

• Defmacroexpand