A Macro Which Expands Another

Sometimes you wish to delay the expansion of a macro. This might be so that you can display a symbols name as well as refer to its value.

The following is a very simple macro which expands a macro whose name is passed:

;--- Expands a macro (macros name is passed) ---
#define ExpandMacro <${$#1}>

The following macro makes use of the above macro to display the color name in a "C" style comment as well as expanding the color into the integer some fictional subroutine requires:

;--- Define a macro to change color ------------
#define RED    1
#define GREEN  2
#define BLUE   3
#define ChangeColor                               \
        /*--- The color used was "{$#1}" ---*/   %\
        ChangeColor(<$ExpandMacro "{$#1}">);

This:

<$ChangeColor "RED">

Expands to:

/*--- The color used was "RED" ---*/
ChangeColor(1);

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PPWIZARD Manual

Saturday May 28 2022 at 2:55pm