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=head1 NAME
rbhash_len - get the number of elements stored in a RBHash.
=head1 SYNOPSIS
#include <roy.h>
int rbhash_len (RBHash *hash);
=head1 DESCRIPTION
This macro returns the length (number of elements) of the RBHash
specified by the I<hash> argument.
=head1 SEE ALSO
L<rbhash(3)|rbhash(3)>, L<rbhash_entry_getkey(3)|rbhash_entry_getkey(3)>,
L<rbhash_entry_setkey(3)|rbhash_entry_setkey(3)>, L<rbhash_free(3)|rbhash_free(3)>,
L<rbhash_insert(3)|rbhash_insert(3)>, L<rbhash_lookup(3)|rbhash_lookup(3)>,
L<rbhash_lookup_next(3)|rbhash_lookup_next(3)>, L<rbhash_new(3)|rbhash_new(3)>,
L<rbhash_remove(3)|rbhash_remove(3)>, L<rbhash_remove_entry(3)|rbhash_remove_entry(3)>,
L<roy(3)|roy(3)>
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