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/******************************************************************************
* ____ _ _____ *
* / ___| / \ | ___| C++ *
* | | / _ \ | |_ Actor *
* | |___ / ___ \| _| Framework *
* \____/_/ \_|_| *
* *
* Copyright 2011-2018 Dominik Charousset *
* *
* Distributed under the terms and conditions of the BSD 3-Clause License or *
* (at your option) under the terms and conditions of the Boost Software *
* License 1.0. See accompanying files LICENSE and LICENSE_ALTERNATIVE. *
* *
* If you did not receive a copy of the license files, see *
* http://opensource.org/licenses/BSD-3-Clause and *
* http://www.boost.org/LICENSE_1_0.txt. *
******************************************************************************/
#pragma once
#include "caf/actor_system.hpp"
#include "caf/actor_system_config.hpp"
#include "caf/detail/type_list.hpp"
#include "caf/detail/type_traits.hpp"
namespace caf {
template <class>
struct exec_main_helper;
template <>
struct exec_main_helper<detail::type_list<actor_system&>> {
using config = actor_system_config;
template <class F>
void operator()(F& fun, actor_system& sys, config&) {
fun(sys);
}
};
template <class T>
struct exec_main_helper<detail::type_list<actor_system&, const T&>> {
using config = T;
template <class F>
void operator()(F& fun, actor_system& sys, config& cfg) {
fun(sys, cfg);
}
};
template <class... Ts, class F = void (*)(actor_system&)>
int exec_main(F fun, int argc, char** argv,
const char* config_file_name = "caf-application.ini") {
using trait = typename detail::get_callable_trait<F>::type;
using arg_types = typename trait::arg_types;
static_assert(detail::tl_size<arg_types>::value == 1
|| detail::tl_size<arg_types>::value == 2,
"main function must have one or two arguments");
static_assert(std::is_same<
typename detail::tl_head<arg_types>::type,
actor_system&
>::value,
"main function must take actor_system& as first parameter");
using arg2 = typename detail::tl_at<arg_types, 1>::type;
using decayed_arg2 = typename std::decay<arg2>::type;
static_assert(std::is_same<arg2, unit_t>::value
|| (std::is_base_of<actor_system_config, decayed_arg2>::value
&& std::is_same<arg2, const decayed_arg2&>::value),
"second parameter of main function must take a subtype of "
"actor_system_config as const reference");
using helper = exec_main_helper<typename trait::arg_types>;
// Pass CLI options to config.
typename helper::config cfg;
if (auto err = cfg.parse(argc, argv, config_file_name)) {
std::cerr << "error while parsing CLI and file options: "
<< actor_system_config::render(err) << std::endl;
return EXIT_FAILURE;
}
// Return immediately if a help text was printed.
if (cfg.cli_helptext_printed)
return EXIT_SUCCESS;
// Load modules.
std::initializer_list<unit_t> unused{unit_t{cfg.template load<Ts>()}...};
CAF_IGNORE_UNUSED(unused);
// Initialize the actor system.
actor_system system{cfg};
if (cfg.slave_mode) {
if (!cfg.slave_mode_fun) {
std::cerr << "cannot run slave mode, I/O module not loaded" << std::endl;
return EXIT_FAILURE;
}
return cfg.slave_mode_fun(system, cfg);
}
helper f;
f(fun, system, cfg);
return EXIT_SUCCESS;
}
} // namespace caf
#define CAF_MAIN(...) \
int main(int argc, char** argv) { \
return ::caf::exec_main<__VA_ARGS__>(caf_main, argc, argv); \
}
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