Re: [Somelib] Errors with downcasting using SOME::Object

[Frank V. C. <fr...@co...>]

What is the hierarchy? You may need dynamic_cast<> based on the rules of
usage in 1998(E) C++ standard.
What is the error, and what is the compiler/platform?

John Palmieri wrote:
> 
> I am trying to integrate SOMELib into snaglepuss and am having errors
> with downcasting my objects.
> 
> You see I have a hiarchy of interfaces for use with dynamicly loadable
> assets (png, mp3, mpg files).  They all get loaded and stuffed into
> chests which are just glorified vectors of type mriIAsset *.  Now each
> of the assets can be rendered to the screen, audio device, etc. with a
> call to the render() method.  But, each type of asset also has enhanced
> functionality based on their type so my png loader asset would also
> inherit the interface mriIVisualAsset which would in turn inherit the
> mriIAsset interface.  The problem I am having is that when I load my
> object I check to see if it is visual, audio.  Let's say it is a visual
> asset.  I then use this code to construct the object:
> 
> SOME::Object<mriIVisualAsset>oAsset(assets[0]);
> //construct our asset
> if(!oAsset.construct()){ ...
> 
> this works fine but now I want to add this asset to my chest:
> 
> asset = static_cast<mriIAsset *>(oAsset);  //error here.  I'm guessting
> the template is not truly inheriting
> 
> chest->addAsset( chestpos, asset );//I should be able to mix and match
> different assests in my chest
> 
> This is an important feature and as much as I know you love the boost
> stuff if it restricts projects from using standard C++ mechanisms when
> working with SOMELib it will have to go.
> 
> -Quinticent
> 
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Frank V. Castellucci
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