sol2/examples/source/docs/inheritance.cpp

#define SOL_ALL_SAFETIES_ON 1
#include <sol/sol.hpp>

struct A { 
	int a = 10;
	virtual int call() { return 0; }
	virtual ~A(){}
};
struct B : A { 
	int b = 11; 
	virtual int call() override { return 20; } 
};

int main (int, char*[]) {

	sol::state lua;

	lua.new_usertype<B>( "A",
		"call", &A::call
	);

	lua.new_usertype<B>( "B",
		"call", &B::call,
		sol::base_classes, sol::bases<A>()
	);

	return 0;
}