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This patch completes the transition of libcc1 from the use of separate template functions for different arities to the use of variadic functions. This is how I had wanted it to work from the very beginning, and is possible now with C++11. I had thought that variadic callbacks required C++17, but it turns out that the approach taken here is basically equivalent to std::apply -- just a bit wordier. libcc1 * rpc.hh (argument_wrapper) <get>: Replace cast operator. (argument_wrapper<T *>) <get>: Likewise. (unmarshall): Add std::tuple overloads. (callback): Remove. (class invoker): New. * libcp1plugin.cc (plugin_init): Update. * libcp1.cc (libcp1::add_callbacks): Update. * libcc1plugin.cc (plugin_init): Update. * libcc1.cc (libcc1::add_callbacks): Update. * connection.cc (cc1_plugin::connection::do_wait): Update.
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