note description: "[ Data structures of the most general kind, used to hold zero or more items. ]" library: "Free implementation of ELKS library" legal: "See notice at end of class." status: "See notice at end of class." names: access access: membership contents: generic date: "$Date: 2018-11-13 12:58:34 +0000 (Tue, 13 Nov 2018) $" revision: "$Revision: 102449 $" deferred class CONTAINER [G] inherit ITERABLE [G] feature -- Access has (v: G): BOOLEAN -- Does structure include v? -- (Reference or object equality, -- based on object_comparison.) deferred ensure not_found_in_empty: Result implies not is_empty end feature -- Status report is_empty: BOOLEAN -- Is there no element? deferred end empty: BOOLEAN obsolete "ELKS 2000: Use `is_empty' instead. [2017-05-31]" -- Is there no element? do Result := is_empty end object_comparison: BOOLEAN -- Must search operations use equal rather than = -- for comparing references? (Default: no, use =.) changeable_comparison_criterion: BOOLEAN -- May object_comparison be changed? -- (Answer: yes by default.) do Result := True end feature -- Status setting compare_objects -- Ensure that future search operations will use equal -- rather than = for comparing references. require changeable_comparison_criterion: changeable_comparison_criterion do object_comparison := True ensure object_comparison end compare_references -- Ensure that future search operations will use = -- rather than equal for comparing references. require changeable_comparison_criterion: changeable_comparison_criterion do object_comparison := False ensure reference_comparison: not object_comparison end feature -- Conversion linear_representation: LINEAR [G] -- Representation as a linear structure deferred end feature {NONE} -- Measurement estimated_count_of (other: ITERABLE [G]): INTEGER_32 -- Estimated number of elements in other. do if attached {FINITE [G]} other as f then Result := f.count elseif attached {READABLE_INDEXABLE [G]} other as r then Result := r.upper - r.lower + 1 end ensure instance_free: class non_negative_result: Result >= 0 end note copyright: "Copyright (c) 1984-2018, Eiffel Software and others" license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)" source: "[ Eiffel Software 5949 Hollister Ave., Goleta, CA 93117 USA Telephone 805-685-1006, Fax 805-685-6869 Website http://www.eiffel.com Customer support http://support.eiffel.com ]" end -- class CONTAINER
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