=begin
== Acces Methods

These are the methods for ((|BDB1::Recnum|))
# module BDB1
##
## All instance methods has the same syntax than the methods of Array
# class Recnum < Common
# class << self

=== Class Methods

--- type[args, ...]
    create a new temporary db file, populated with the given object


--- create([name, flags, mode, options])
--- new([name, flags, mode, options])
--- open([name, flags, mode, options])
     open the database

       : ((|options|))

           : ((|set_flags|))
                general database configuration
           : ((|set_cachesize|))
                set the database cache size
           : ((|set_pagesize|))
                set the underlying database page size
           : ((|set_lorder|))
                set the database byte order
           : ((|set_re_delim|))
                set the variable-length record delimiter
           : ((|set_re_len|))
                set the fixed-length record length
           : ((|set_re_pad|))
                set the fixed-length record pad byte

# end
=== Methods

((*All this methods has the same syntax than for the class ((|Array|))*))

--- self[nth] 
    retrieves the ((|nth|)) item from an array. Index starts from zero.
    If index is the negative, counts backward from the end of the array. 
    The index of the last element is -1. Returns ((|nil|)), if the ((|nth|))
    element is not exist in the array. 

--- self[start..end] 
    returns an array containing the objects from ((|start|)) to ((|end|)),
    including both ends. if end is larger than the length of the array,
    it will be rounded to the length. If ((|start|)) is out of an array 
    range , returns ((|nil|)).
    And if ((|start|)) is larger than end with in array range, returns
    empty array ([]). 

--- self[start, length] 
    returns an array containing ((|length|)) items from ((|start|)). 
    Returns ((|nil|)) if ((|length|)) is negative. 

--- self[nth] = val 
    changes the ((|nth|)) element of the array into ((|val|)). 
    If ((|nth|)) is larger than array length, the array shall be extended
    automatically. Extended region shall be initialized by ((|nil|)). 

--- self[start..end] = val 
    replace the items from ((|start|)) to ((|end|)) with ((|val|)). 
    If ((|val|)) is not an array, the type of ((|val|)) will be converted
    into the Array using ((|to_a|)) method. 

--- self[start, length] = val 
    replace the ((|length|)) items from ((|start|)) with ((|val|)). 
    If ((|val|)) is not an array, the type of ((|val|)) will be converted 
    into the Array using ((|to_a|)). 

--- self + other 
    concatenation

--- self * times 
    repetition

--- self - other 
    substraction

--- self & other 
    returns a new array which contains elements belong to both elements.

--- self | other 
    join

--- self << obj 
    append a new item with value ((|obj|)). Return ((|self|))

--- self <=> other 
    comparison : return -1, 0 or 1

--- clear
    delete all elements 

--- collect {|item| ..} 
    Returns a new array by invoking block once for every element,
    passing each element as a parameter to block. The result of block
    is used as the given element 

--- collect! {|item| ..} 
    invokes block once for each element of db, replacing the element
    with the value returned by block.

--- concat(other) 
    append ((|other|)) to the end

--- delete(val) 
    delete the item which matches to ((|val|))

--- delete_at(pos) 
    delete the item at ((|pos|))

--- delete_if {|x| ...} 
    delete the item if the block return ((|true|))

--- reject!{|x|...} 
    delete the item if the block return ((|true|))

--- each {|x| ...} 
    iterate over each item

--- each_index {|i| ...} 
    iterate over each index

--- empty?
    return ((|true|)) if the db file is empty 

--- fill(val)
    set the entire db with ((|val|)) 

--- fill(val, start[, length])
    fill the db with ((|val|)) from ((|start|)) 

--- fill(val, start..end)
    set the db with ((|val|)) from ((|start|)) to ((|end|)) 

--- include?(val) 
    returns true if the given ((|val|)) is present

--- index(val) 
    returns the index of the item which equals to ((|val|)). 
    If no item found, returns ((|nil|))

--- indexes(index_1,..., index_n) 
    returns an array consisting of elements at the given indices

--- indices(index_1,..., index_n) 
    returns an array consisting of elements at the given indices

--- join([sep]) 
    returns a string created by converting each element to a string

--- length
--- size 
    return the number of elements of the db file

--- nitems 
    return the number of non-nil elements of the db file

--- pop 
    pops and returns the last value

--- push(obj...) 
    appends obj

--- replace(other) 
    replaces the contents of the db file  with the contents of ((|other|))

--- reverse 
    returns the array of the items in reverse order

--- reverse! 
    replaces the items in reverse order.

--- reverse_each {|x| ...} 
    iterate over each item in reverse order

--- rindex(val) 
    returns the index of the last item which verify ((|item == val|))

--- shift 
    remove and return the first element

--- to_a
--- to_ary
    return an ((|Array|)) with all elements

--- unshift(obj) 
    insert ((|obj|)) to the front of the db file

# end
# end
=end