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How can type-insensitive macros be created?

A type-insensitive macro is a macro that performs the same basic operation on different data types. This task
can be accomplished by using the concatenation operator to create a call to a type-sensitive function based
on the parameter passed to the macro. The following program provides an example:

#include <stdio.h>
#define SORT(data_type) sort_ ## data_type
void sort_int(int** i);
void sort_long(long** l);
void sort_float(float** f);
void sort_string(char** s);
void main(void);
void main(void)
     int** ip;
     long** lp;
     float** fp;
     char** cp;

This program contains four functions to sort four different data types: int, long, float, and string (notice
that only the function prototypes are included for brevity). A macro named SORT was created to take the data
type passed to the macro and combine it with the sort_ string to form a valid function call that is appropriate
for the data type being sorted. Thus, the string


translates into


after being run through the preprocessor.