Class DS_RESIZABLE

Class DS_RESIZABLE

note

description:

    "Bounded data structures that can be resized"

library:    "Gobo Eiffel Structure Library"
author:     "Eric Bezault <ericb@gobosoft.com>"
copyright:  "Copyright (c) 1999-2001, Eric Bezault and others"
license:    "MIT License"

deferred class interface

DS_RESIZABLE [G]

inherit

DS_CONTAINER [G]

feature {NONE} -- Initialization

make_default
        -- Create an empty container and allocate memory
        -- space for at least default_capacity items.
        -- (From DS_CONTAINER.)
    deferred
    ensure
        empty: is_empty
        capacity_set: capacity = default_capacity

feature -- Measurement

count: INTEGER
        -- Number of items in container
        -- (From DS_CONTAINER.)
    deferred

capacity: INTEGER
        -- Maximum number of items in container
    deferred

default_capacity: INTEGER
        -- Initial capacity in make_default
        -- (Default value: 10)
    ensure
        default_capacity_positive: Result >= 0

feature -- Status report

is_empty: BOOLEAN
        -- Is container empty?
        -- (From DS_CONTAINER.)

is_full: BOOLEAN
        -- Is container full?

feature -- Comparison

is_equal (other: like Current): BOOLEAN
        -- Is current container equal to other?
        -- (From GENERAL.)
    require
        other_not_void: other /= Void
    deferred
    ensure
        consistent: standard_is_equal (other) implies Result
        same_type: Result implies same_type (other)
        symmetric: Result implies other.is_equal (Current)
        same_count: Result implies count = other.count

feature -- Duplication

copy (other: like Current)
        -- Copy other to current container.
        -- (From GENERAL.)
    require
        other_not_void: other /= Void
        type_identity: same_type (other)
    deferred
    ensure
        is_equal: is_equal (other)

feature -- Removal

wipe_out
        -- Remove all items from container.
        -- (From DS_CONTAINER.)
    deferred
    ensure
        wiped_out: is_empty

feature -- Resizing

resize (n: INTEGER)
        -- Resize container so that it can contain
        -- at least n items. Do not lose any item.
    require
        n_large_enough: n >= capacity
    deferred
    ensure
        capacity_set: capacity = n

invariant

positive_count: count >= 0
empty_definition: is_empty = (count = 0)
    -- (From DS_CONTAINER.)

count_constraint: count <= capacity
full_definition: is_full = (count = capacity)

end -- class DS_RESIZABLE