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Unlike COM, SCF supports interface versions. That is, a shared class
could implement version 0.3.6 of given interface, and if client requests that
interface of a version lower or equal than 0.3.6, a correct interface pointer
is returned. For this to work you need to define inside each interface header
file a specialization of the
scfInterface<> template class for each
interface. This specialization must provide the interface's version number as
the result of its
GetVersion() method. To correctly support different
versions of interfaces you should follow these guidelines:
The possible range for major and minor version numbers is 0..255, and the range for micro version number is 0..65535.
When you query an interface, you should always tell it what interface version
are you looking for. If a module cannot provide an interface compatible with
the requested version, then
QueryInterface() will return `NULL'
(same as if interface wasn't available at all). You can use
scfCompatibleVersion() to check whether the requested version is
compatible with interface version. To specify the version of an interface
you can use the
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