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NAME
wnloop -- package for writing iterators
SYNOPSIS
extern bool wn_loopinit_just_called;
wn_loopinit();
DESCRIPTION
This package provides a procedure for writing generalized iterators.
These iterators work in for loops. Use "wn_loopinit()" in
the first part of the for loop; use your iterator in the second part;
the third part is blank.
Write an iterator using this template:
bool my_loop(my_object,pmy_dummy)
my_type my_object;
my_dummy_type *pmy_dummy;
{
extern bool wn_loopinit_just_called;
if(wn_loopinit_just_called)
{
*pmy_dummy = first_dummy(my_object); /* set up first dummy */
wn_loopinit_just_called = FALSE;
}
else
{
(*pmy_dummy) = next_dummy(my_object,*pmy_dummy);
}
return(*pmy_dummy != NULL);
}
Use your iterator as follows:
{
my_type my_dummy;
for(wn_loopinit();my_loop(my_object,&my_dummy);)
{
...
}
}
Also, consider using already existing iterators to write new
iterators.
EXAMPLES
BUGS
SEE ALSO
wnset, wnsll
AUTHOR
Will Naylor
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