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Author:halw

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Date:2008-12-31T02:44:19.000000Z


git-svn-id: https://svn.eiffel.com/eiffel-org/trunk@150 abb3cda0-5349-4a8f-a601-0c33ac3a8c38
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halw
2008-12-31 02:44:19 +00:00
parent 53bda900f9
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documentation/current/platform-specifics/microsoft-windows/com/eiffelcom-wizard/eiffelcom-wizard-reference/class-hierarchy.wiki
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[[Property:weight|2]] [[Property:weight|2]]
[[Property:uuid|3f78176c-179f-78a4-cf32-47ec548bbb16]] [[Property:uuid|3f78176c-179f-78a4-cf32-47ec548bbb16]]
The generated Eiffel code reflects the architecture of the component described in the definition file. Each interface corresponds to a deferred Eiffel class that includes one deferred feature per interface function. The deferred features are implemented in heirs of the interface class. Classes inheriting from these interfaces implement either a coclass or an implemented interface (that is an interface whose instance might be used as an argument on one of the component interfaces functions). The generated Eiffel code reflects the architecture of the component described in the definition file. Each interface corresponds to a deferred Eiffel class that includes one deferred feature per interface function. The deferred features are implemented in heirs of the interface class. Classes inheriting from these interfaces implement either a coclass or an implemented interface (that is an interface whose instance might be used as an argument on one of the component interfaces functions).
[[Image:interface-inheritance]]
[[Image:interface-inheritance]]
In a project accessing an existing component, the Eiffel classes corresponding to component coclasses inherit from the class [[ref:libraries/com/reference/ecom_queriable_chart| <eiffel>ECOM_QUERIABLE</eiffel> ]] , which is part of the EiffelCOM library. This class includes the feature <eiffel>make_from_other</eiffel> which allows initializing the component from another instance of [[ref:libraries/com/reference/ecom_interface_chart| <eiffel>ECOM_INTERFACE</eiffel> ]] . In a project accessing an existing component, the Eiffel classes corresponding to component coclasses inherit from the class [[ref:libraries/com/reference/ecom_queriable_chart| <eiffel>ECOM_QUERIABLE</eiffel> ]] , which is part of the EiffelCOM library. This class includes the feature <eiffel>make_from_other</eiffel> which allows initializing the component from another instance of [[ref:libraries/com/reference/ecom_interface_chart| <eiffel>ECOM_INTERFACE</eiffel> ]] .
[[Image:interface-inheritance-server]]
[[Image:interface-inheritance-server]]
In a project implementing a new component, the Eiffel classes corresponding to component coclasses inherit from the class [[ref:libraries/com/reference/ecom_stub_chart|<eiffel>ECOM_STUB</eiffel>]], which is part of the EiffelCOM library. This class includes the feature [[ref:libraries/com/reference/ecom_stub_chart|<eiffel>create_item</eiffel>]] which allows initializing the component. In a project implementing a new component, the Eiffel classes corresponding to component coclasses inherit from the class [[ref:libraries/com/reference/ecom_stub_chart|<eiffel>ECOM_STUB</eiffel>]], which is part of the EiffelCOM library. This class includes the feature [[ref:libraries/com/reference/ecom_stub_chart|<eiffel>create_item</eiffel>]] which allows initializing the component.
The '''Interface_proxy''' folder includes Eiffel classes wrapping interfaces that may be returned by functions on other interfaces. These classes inherit from both the deferred interface class located in '''Common\Interfaces''' and [[ref:libraries/com/reference/ecom_queriable_chart| <eiffel>ECOM_QUERIABLE</eiffel> ]] . The '''Interface_proxy''' folder includes Eiffel classes wrapping interfaces that may be returned by functions on other interfaces. These classes inherit from both the deferred interface class located in '''Common\Interfaces''' and [[ref:libraries/com/reference/ecom_queriable_chart| <eiffel>ECOM_QUERIABLE</eiffel> ]] .
[[Image:implemented-interface]]
[[Image:implemented-interface]]
The '''Interface_stub''' folder includes Eiffel classes implementing interfaces that may be given to the component as an argument. These classes inherit from both the deferred interface class and [[ref:libraries/com/reference/ecom_stub_chart| <eiffel>ECOM_STUB</eiffel> ]] . The '''Interface_stub''' folder includes Eiffel classes implementing interfaces that may be given to the component as an argument. These classes inherit from both the deferred interface class and [[ref:libraries/com/reference/ecom_stub_chart| <eiffel>ECOM_STUB</eiffel> ]] .
[[Image:implemented-interface-server]]
[[Image:implemented-interface-server]]
{{seealso|[[How the EiffelCOM Wizard works|How the EiffelCOM Wizard Works]] , [[Generated Files|Generated Files]] , [[Eiffel Project Processing|Adding a COM Interface to an Eiffel Project]] , [[Reusing a COM Component|Accessing a COM Component]] , [[Building a COM Component|Building a COM Component]] , [[Wizards: Command Line Options|Command Line Options]] }} {{seealso|[[How the EiffelCOM Wizard works|How the EiffelCOM Wizard Works]] , [[Generated Files|Generated Files]] , [[Eiffel Project Processing|Adding a COM Interface to an Eiffel Project]] , [[Reusing a COM Component|Accessing a COM Component]] , [[Building a COM Component|Building a COM Component]] , [[Wizards: Command Line Options|Command Line Options]] }}

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documentation/current/solutions/dates-and-times/eiffeltime/eiffeltime-tutorial/duration.wiki
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[[Property:title|Duration]] [[Property:title|Duration]]
[[Property:weight|1]] [[Property:weight|1]]
[[Property:uuid|64672bd0-b696-0c39-1e30-5ac64aae4a99]] [[Property:uuid|64672bd0-b696-0c39-1e30-5ac64aae4a99]]
The classes <eiffel>TIME_DURATION</eiffel>, <eiffel>DATE_DURATION</eiffel>, and <eiffel>DATE_TIME_DURATION</eiffel> model time durations. The classes <eiffel>[[eiffel:?system=time.78D80981-EF3C-42EC-8919-EF7D7BB61701&target=time&cluster=time&class=TIME_DURATION TIME_DURATION]]</eiffel>, <eiffel>DATE_DURATION</eiffel>, and <eiffel>DATE_TIME_DURATION</eiffel> model time durations.
The classes dealing with duration inherit from <eiffel>DURATION</eiffel>, which in turn inherits from <eiffel>GROUP_ELEMENT</eiffel> and <eiffel>PART_COMPARABLE</eiffel>. From this lineage comes the query <eiffel>zero</eiffel>, the addition features <eiffel>infix +</eiffel> and <eiffel>infix -</eiffel> and the unary features <eiffel>prefix +</eiffel>, and <eiffel>prefix -</eiffel>. The classes dealing with duration inherit from <eiffel>DURATION</eiffel>, which in turn inherits from <eiffel>GROUP_ELEMENT</eiffel> and <eiffel>PART_COMPARABLE</eiffel>. From this lineage comes the query <eiffel>zero</eiffel>, the addition features <eiffel>infix +</eiffel> and <eiffel>infix -</eiffel> and the unary features <eiffel>prefix +</eiffel>, and <eiffel>prefix -</eiffel>.