Method add_function

rpc/rpc.cpp:195–199

    public:
        unordered_map<uint64_t, Function> m_map;
        virtual int add_function(FunctionID func_id, Function func) override
        {
            auto ret = m_map.insert({func_id, func});
            return ret.second ? 0 : -1;
        }
        virtual int remove_function(FunctionID func_id) override
        {
            auto ret = m_map.erase(func_id);