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<h2>Eiffel mode</h2>
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note
    description: "[
        Project-wide universal properties.
        This class is an ancestor to all developer-written classes.
        ANY may be customized for individual projects or teams.
        ]"

    library: "Free implementation of ELKS library"
    status: "See notice at end of class."
    legal: "See notice at end of class."
    date: "$Date: 2013-01-25 11:49:00 -0800 (Fri, 25 Jan 2013) $"
    revision: "$Revision: 712 $"

class
    ANY

feature -- Customization

feature -- Access

    generator: STRING
            -- Name of current object's generating class
            -- (base class of the type of which it is a direct instance)
        external
            "built_in"
        ensure
            generator_not_void: Result /= Void
            generator_not_empty: not Result.is_empty
        end

    generating_type: TYPE [detachable like Current]
            -- Type of current object
            -- (type of which it is a direct instance)
        do
            Result := {detachable like Current}
        ensure
            generating_type_not_void: Result /= Void
        end

feature -- Status report

    conforms_to (other: ANY): BOOLEAN
            -- Does type of current object conform to type
            -- of `other' (as per Eiffel: The Language, chapter 13)?
        require
            other_not_void: other /= Void
        external
            "built_in"
        end

    same_type (other: ANY): BOOLEAN
            -- Is type of current object identical to type of `other'?
        require
            other_not_void: other /= Void
        external
            "built_in"
        ensure
            definition: Result = (conforms_to (other) and
                                        other.conforms_to (Current))
        end

feature -- Comparison

    is_equal (other: like Current): BOOLEAN
            -- Is `other' attached to an object considered
            -- equal to current object?
        require
            other_not_void: other /= Void
        external
            "built_in"
        ensure
            symmetric: Result implies other ~ Current
            consistent: standard_is_equal (other) implies Result
        end

    frozen standard_is_equal (other: like Current): BOOLEAN
            -- Is `other' attached to an object of the same type
            -- as current object, and field-by-field identical to it?
        require
            other_not_void: other /= Void
        external
            "built_in"
        ensure
            same_type: Result implies same_type (other)
            symmetric: Result implies other.standard_is_equal (Current)
        end

    frozen equal (a: detachable ANY; b: like a): BOOLEAN
            -- Are `a' and `b' either both void or attached
            -- to objects considered equal?
        do
            if a = Void then
                Result := b = Void
            else
                Result := b /= Void and then
                            a.is_equal (b)
            end
        ensure
            definition: Result = (a = Void and b = Void) or else
                        ((a /= Void and b /= Void) and then
                        a.is_equal (b))
        end

    frozen standard_equal (a: detachable ANY; b: like a): BOOLEAN
            -- Are `a' and `b' either both void or attached to
            -- field-by-field identical objects of the same type?
            -- Always uses default object comparison criterion.
        do
            if a = Void then
                Result := b = Void
            else
                Result := b /= Void and then
                            a.standard_is_equal (b)
            end
        ensure
            definition: Result = (a = Void and b = Void) or else
                        ((a /= Void and b /= Void) and then
                        a.standard_is_equal (b))
        end

    frozen is_deep_equal (other: like Current): BOOLEAN
            -- Are `Current' and `other' attached to isomorphic object structures?
        require
            other_not_void: other /= Void
        external
            "built_in"
        ensure
            shallow_implies_deep: standard_is_equal (other) implies Result
            same_type: Result implies same_type (other)
            symmetric: Result implies other.is_deep_equal (Current)
        end

    frozen deep_equal (a: detachable ANY; b: like a): BOOLEAN
            -- Are `a' and `b' either both void
            -- or attached to isomorphic object structures?
        do
            if a = Void then
                Result := b = Void
            else
                Result := b /= Void and then a.is_deep_equal (b)
            end
        ensure
            shallow_implies_deep: standard_equal (a, b) implies Result
            both_or_none_void: (a = Void) implies (Result = (b = Void))
            same_type: (Result and (a /= Void)) implies (b /= Void and then a.same_type (b))
            symmetric: Result implies deep_equal (b, a)
        end

feature -- Duplication

    frozen twin: like Current
            -- New object equal to `Current'
            -- `twin' calls `copy'; to change copying/twinning semantics, redefine `copy'.
        external
            "built_in"
        ensure
            twin_not_void: Result /= Void
            is_equal: Result ~ Current
        end

    copy (other: like Current)
            -- Update current object using fields of object attached
            -- to `other', so as to yield equal objects.
        require
            other_not_void: other /= Void
            type_identity: same_type (other)
        external
            "built_in"
        ensure
            is_equal: Current ~ other
        end

    frozen standard_copy (other: like Current)
            -- Copy every field of `other' onto corresponding field
            -- of current object.
        require
            other_not_void: other /= Void
            type_identity: same_type (other)
        external
            "built_in"
        ensure
            is_standard_equal: standard_is_equal (other)
        end

    frozen clone (other: detachable ANY): like other
            -- Void if `other' is void; otherwise new object
            -- equal to `other'
            --
            -- For non-void `other', `clone' calls `copy';
            -- to change copying/cloning semantics, redefine `copy'.
        obsolete
            "Use `twin' instead."
        do
            if other /= Void then
                Result := other.twin
            end
        ensure
            equal: Result ~ other
        end

    frozen standard_clone (other: detachable ANY): like other
            -- Void if `other' is void; otherwise new object
            -- field-by-field identical to `other'.
            -- Always uses default copying semantics.
        obsolete
            "Use `standard_twin' instead."
        do
            if other /= Void then
                Result := other.standard_twin
            end
        ensure
            equal: standard_equal (Result, other)
        end

    frozen standard_twin: like Current
            -- New object field-by-field identical to `other'.
            -- Always uses default copying semantics.
        external
            "built_in"
        ensure
            standard_twin_not_void: Result /= Void
            equal: standard_equal (Result, Current)
        end

    frozen deep_twin: like Current
            -- New object structure recursively duplicated from Current.
        external
            "built_in"
        ensure
            deep_twin_not_void: Result /= Void
            deep_equal: deep_equal (Current, Result)
        end

    frozen deep_clone (other: detachable ANY): like other
            -- Void if `other' is void: otherwise, new object structure
            -- recursively duplicated from the one attached to `other'
        obsolete
            "Use `deep_twin' instead."
        do
            if other /= Void then
                Result := other.deep_twin
            end
        ensure
            deep_equal: deep_equal (other, Result)
        end

    frozen deep_copy (other: like Current)
            -- Effect equivalent to that of:
            --      `copy' (`other' . `deep_twin')
        require
            other_not_void: other /= Void
        do
            copy (other.deep_twin)
        ensure
            deep_equal: deep_equal (Current, other)
        end

feature {NONE} -- Retrieval

    frozen internal_correct_mismatch
            -- Called from runtime to perform a proper dynamic dispatch on `correct_mismatch'
            -- from MISMATCH_CORRECTOR.
        local
            l_msg: STRING
            l_exc: EXCEPTIONS
        do
            if attached {MISMATCH_CORRECTOR} Current as l_corrector then
                l_corrector.correct_mismatch
            else
                create l_msg.make_from_string ("Mismatch: ")
                create l_exc
                l_msg.append (generating_type.name)
                l_exc.raise_retrieval_exception (l_msg)
            end
        end

feature -- Output

    io: STD_FILES
            -- Handle to standard file setup
        once
            create Result
            Result.set_output_default
        ensure
            io_not_void: Result /= Void
        end

    out: STRING
            -- New string containing terse printable representation
            -- of current object
        do
            Result := tagged_out
        ensure
            out_not_void: Result /= Void
        end

    frozen tagged_out: STRING
            -- New string containing terse printable representation
            -- of current object
        external
            "built_in"
        ensure
            tagged_out_not_void: Result /= Void
        end

    print (o: detachable ANY)
            -- Write terse external representation of `o'
            -- on standard output.
        do
            if o /= Void then
                io.put_string (o.out)
            end
        end

feature -- Platform

    Operating_environment: OPERATING_ENVIRONMENT
            -- Objects available from the operating system
        once
            create Result
        ensure
            operating_environment_not_void: Result /= Void
        end

feature {NONE} -- Initialization

    default_create
            -- Process instances of classes with no creation clause.
            -- (Default: do nothing.)
        do
        end

feature -- Basic operations

    default_rescue
            -- Process exception for routines with no Rescue clause.
            -- (Default: do nothing.)
        do
        end

    frozen do_nothing
            -- Execute a null action.
        do
        end

    frozen default: detachable like Current
            -- Default value of object's type
        do
        end

    frozen default_pointer: POINTER
            -- Default value of type `POINTER'
            -- (Avoid the need to write `p'.`default' for
            -- some `p' of type `POINTER'.)
        do
        ensure
            -- Result = Result.default
        end

    frozen as_attached: attached like Current
            -- Attached version of Current
            -- (Can be used during transitional period to convert
            -- non-void-safe classes to void-safe ones.)
        do
            Result := Current
        end

invariant
    reflexive_equality: standard_is_equal (Current)
    reflexive_conformance: conforms_to (Current)

note
    copyright: "Copyright (c) 1984-2012, 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

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