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* This is useful for fast comparison of Ids, but the number *should* remains private
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* especially considering that it changes from one running instance to an other.
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KoUniqueNumberForIdServer();
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~KoUniqueNumberForIdServer();
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static KoUniqueNumberForIdServer* instance();
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* @return an unique number for the given \p _id , for two different call to this function
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* with the same \p id the function will always return the same value.
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* KoUniqueNumberForIdServer::instance()->numberForId( "rgb" ) == KoUniqueNumberForIdServer::instance()->numberForId( "rgb" );
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* KoUniqueNumberForIdServer::instance()->numberForId( "rgb" ) != KoUniqueNumberForIdServer::instance()->numberForId( "cmyk" );