why it is much more difficult to provide wrappers in other languages to C++ code as opposed to C code ?
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why it is much more difficult to provide wrappers in other languages to C++ code as opposed to C code ?
This varies significantly by the library itself and how its designed.
Speaking very generally, C++ is more complex in that it has objects, classes and interfaces, where C is primarily functions. Member functions of a class are named and called differently, so wrapping them takes a bit more work to provide equivalent names.
Once the library is wrapped to provide an equivalent interface and calling conventions are handled, the next difference is C++ allowing objects to be passed as function parameters, which may necessitate deep copies and similar. In a library taking purely pointers, for example COM, this isn’t a problem (which is part of why COM is interoperable with so many languages and other systems), but handling the necessary copy code is very compiler-dependent even within C++.