C.1.14 New csQueryRegistryOrLoad Function

The function csQueryRegistryOrLoad() has been added to `iutil/plugin.h'. This is a convenience function which embodies the common idiom of first querying the object-registry for an object implementing some interface, and then asking the plugin manager to load a plugin supplying the desired object if it was not found in the object-registry. It also registers the object with the object-registry if the plugin manager loads it successfully:

csRef<iEngine> engine = csQueryRegistryOrLoad<iEngine> (object_reg,
  "crystalspace.engine.3d");

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