The C++ language is based on sequential programming. Consequently it is not suited for the modeling of concurrent activities. Furthermore most system and hardware models require a notion of delays, clocks or time. features which are not present in C++ as a software programming language. As a result, complex and detailed systems cannot be easily described in C++ alone. Additionally communication mechanisms used in hardware models, such as signals and ports, are very different from those used in software programming. Lastly, the data types found in C++ are too remote from the actual hardware implementation.
Ultimately, new dedicated data types and communication mechanisms have to be provided.
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