/*
 *  call-seq:
 *     MultiMapper.new() -> new_multi_mapper
 *  
 *  Returns a new multi-mapper object and compiles it for optimization.
 *
 *  Note that MultiMapper is immutable.
 */
static VALUE 
frb_mulmap_init(VALUE self, VALUE rmappings)
{
    MultiMapper *mulmap = DATA_PTR(self);
    rb_hash_foreach(rmappings, frb_mulmap_add_mappings_i, (VALUE)mulmap);
    mulmap_compile(mulmap);

    return self;
}