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Its aim was to replace the popular [[Microsoft Foundation Classes]] with [[Visual Component Library]] (VCL). CLX was based on [[Qt (framework)|Qt]] by [[Nokia]]{{Citation needed|reason=MasterD6 source says Trolltech not Nokia, but Norwegian is concordant|date=October 2018}}.<ref name="MasterD6"/>{{rp|196}} The [[Application programming interface|API]] of CLX almost completely followed VCL. It was envisioned that existing applications using VCL would be recompiled with CLX.
However, due to lackluster performance on Windows, subtle differences from VCL, and bugs, it did not become the expected successor to VCL.
In terms of [[Object-oriented programming|object-oriented]] approach, CLX forms an object hierarchy where the TObject class serves as the ''[[Superclass (computer science)|base class]]''. All other classes inherit or indirectly inherit the TObject class.
Today, many concepts that were defined with CLX have been implemented with the [[Lazarus Component Library]] (LCL) for the [[Lazarus (IDE)|Lazarus]] IDE. By docking to different [[widgetset]]s, the LCL is able to support an even larger spectrum of platforms including [[Mac OS X]] and [[Android (operating system)|Android]].
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