Bug 12854 – Cannot interface to C++ code with const class pointers

D: extern(C++) interface DClass { int getIndex() const; } extern(C++) void useObj(in DClass dclass); //I also tried const DClass C++: struct DClass { virtual int getIndex() const = 0; } void useObj(const DClass* dclass); //DClass* works though! The code above refuses to link. Whether not the D declaration for useObj is marked `const`, or `in` makes no difference, either way the C++ declaration can't have const in it. OTOH, if instead it's `ref const(DStruct)` and `const DStruct&` (or the equivalent pointer declarations it links fine. I'm aware of the differences between const in C++ and D, but the above makes it worse: D can happily think it's const while the C++ code is free to do whatever it wants without even having to use const_cast.

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