</H4>
<P STYLE="margin-bottom: 0.51cm">Each arg_xxx structure should have a
constructor function that is responsible for allocating memory for it
and populating the data within it. By convention, there are
ordinarily three forms of constructor function for each arg_xxx
struct</P>
<PRE CLASS="western">struct arg_xxx* arg_xxx0(const char* shortopts, const char* longopts,
                         const char *datatype, const char *glossary);

struct arg_xxx* arg_xxx1(const char* shortopts, const char* longopts,