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Since Lua function arguments are not typed, there is no explicit "const", and a function can always modify the parameter. When passing `ChanMapping const&` as argument, the object is copy constructed. In this specific case the std::map<> members of ChanMapping allocate memory. Passing a pointer to the object works around this issue. LuaBridge later dereferences the object as needed when calling c++ methods, and copy-construction would only happen later.
Please see the Ardour web site at http://ardour.org/ for all documentation..
For information on building ardour:
http://ardour.org/development.html