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// Copyright 2025 Christian Granzin
// Copyright 2010 Christophe Henry
// henry UNDERSCORE christophe AT hotmail DOT com
// This is an extended version of the state machine available in the boost::mpl library
// Distributed under the same license as the original.
// Copyright for the original version:
// Copyright 2005 David Abrahams and Aleksey Gurtovoy. Distributed
// under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// back-end
#include "Backmp11.hpp"
//front-end
#include <boost/msm/front/state_machine_def.hpp>
#include <boost/msm/front/functor_row.hpp>
#include <boost/msm/back/queue_container_circular.hpp>
#include <boost/msm/back/history_policies.hpp>
#ifndef BOOST_MSM_NONSTANDALONE_TEST
#define BOOST_TEST_MODULE backmp11_context_test
#endif
#include <boost/test/unit_test.hpp>
namespace msm = boost::msm;
namespace mp11 = boost::mp11;
using namespace msm::front;
using namespace msm::backmp11;
namespace
{
// Events.
struct EnterSubFsm{};
struct ExitSubFsm{};
// Context.
struct Context
{
uint32_t machine_entries = 0;
uint32_t machine_exits = 0;
};
template<typename Fsm>
static Context& get_context(Fsm& fsm)
{
return fsm.get_context();
}
// States.
struct Default : public state<>{};
template<typename T>
struct MachineBase_ : public state_machine_def<MachineBase_<T>>
{
template <typename Event, typename Fsm>
void on_entry(const Event& /*event*/, Fsm& fsm)
{
Context& context = get_context(fsm);
context.machine_entries++;
};
template <typename Event, typename Fsm>
void on_exit(const Event& /*event*/, Fsm& fsm)
{
get_context(fsm).machine_exits++;
};
using initial_state = Default;
};
template <bool WithRootSm, bool WithFavorCompileTime>
struct Test
{
class UpperMachine;
struct Config : default_state_machine_config {
using context = Context;
using root_sm = mp11::mp_if_c<WithRootSm, UpperMachine, no_root_sm>;
using compile_policy = mp11::mp_if_c<WithFavorCompileTime, favor_compile_time, favor_runtime_speed>;
};
struct LowerMachine_ : public MachineBase_<LowerMachine_> {};
using LowerMachine = state_machine<LowerMachine_, Config>;
struct MiddleMachine_ : public MachineBase_<MiddleMachine_>
{
using transition_table = mp11::mp_list<
Row< Default , EnterSubFsm , LowerMachine >,
Row< LowerMachine , ExitSubFsm , Default >
>;
};
using MiddleMachine = state_machine<MiddleMachine_, Config>;
struct UpperMachine_ : public MachineBase_<UpperMachine_>
{
UpperMachine_() = default;
UpperMachine_(bool optional_argument) : optional_argument(optional_argument) {}
using transition_table = mp11::mp_list<
Row< Default , EnterSubFsm , MiddleMachine>,
Row< MiddleMachine , ExitSubFsm , Default>
>;
bool optional_argument;
};
class UpperMachine : public state_machine<UpperMachine_, Config, UpperMachine>
{
public:
using Base = state_machine<UpperMachine_, Config, UpperMachine>;
using Base::Base;
};
static void run()
{
// Test with only context.
{
Context context;
UpperMachine test_machine{context};
BOOST_ASSERT(&test_machine.get_context() == &context);
auto& middle_machine = test_machine.template get_state<MiddleMachine>();
BOOST_ASSERT(&middle_machine.get_context() == &context);
// Suppress warnings in case the assert is not present.
[[maybe_unused]] auto& lower_machine = middle_machine.template get_state<LowerMachine>();
BOOST_ASSERT(&lower_machine.get_context() == &context);
process_events(test_machine);
}
// Test with context and additional constructor argument.
{
Context context;
UpperMachine test_machine{context, true};
BOOST_ASSERT(test_machine.optional_argument == true);
BOOST_ASSERT(&test_machine.get_context() == &context);
auto& middle_machine = test_machine.template get_state<MiddleMachine>();
BOOST_ASSERT(&middle_machine.get_context() == &context);
// Suppress warnings in case the assert is not present.
[[maybe_unused]] auto& lower_machine = middle_machine.template get_state<LowerMachine>();
BOOST_ASSERT(&lower_machine.get_context() == &context);
BOOST_ASSERT(&lower_machine.get_context() == &context);
process_events(test_machine);
}
};
static void process_events(UpperMachine& test_machine)
{
test_machine.start();
BOOST_CHECK(test_machine.get_context().machine_entries == 1);
test_machine.process_event(EnterSubFsm());
BOOST_CHECK(test_machine.get_context().machine_entries == 2);
test_machine.process_event(EnterSubFsm());
BOOST_CHECK(test_machine.get_context().machine_entries == 3);
test_machine.process_event(ExitSubFsm());
BOOST_CHECK(test_machine.get_context().machine_exits == 1);
test_machine.process_event(ExitSubFsm());
BOOST_CHECK(test_machine.get_context().machine_exits == 2);
test_machine.stop();
BOOST_CHECK(test_machine.get_context().machine_exits == 3);
};
};
BOOST_AUTO_TEST_CASE( backmp11_context_test )
{
Test<false, false>::run();
Test<false, true>::run();
Test<true, false>::run();
Test<true, true>::run();
}
} // namespace
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