In many systems, legacy C code is combined with newer C++ code. A common (yet wrong) practice is to wrap the C functions in a single C++ class and create a single instance thereof, which provides as its interface a series of operations mapped directly to the legacy functions. However, such a general wrapper class is not recommended. It allows indiscriminate access to a variety of unrelated operations. In addition, it isn’t really an object-oriented solution; rather, such a class is merely a collection of operations. A better design approach is to divide the legacy functions into meaningful, self-contained units and wrap each unit by a dedicated class. For example, instead of wrapping a bunch of legacy networking functions in a large class, it is advisable to group these functions according to specific protocols.
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