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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 <boost/msm/backmp11/state_machine.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_root_sm_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{};
struct TriggerAction{};
struct TriggerActionWithGuard{};
// States.
struct Default : public state<>{};
template <bool TestRootFsmParameter>
struct hierarchical_machine
{
// Actions
struct Action
{
template<typename Event, typename Fsm, typename Source, typename Target>
void operator()(const Event&, Fsm&, Source&, Target&)
{
if constexpr (TestRootFsmParameter)
{
static_assert(std::is_same_v<Fsm,RootSm>);
}
}
};
// Guards
struct Guard
{
template<typename Event, typename Fsm, typename Source, typename Target>
bool operator()(const Event&, Fsm&, Source&, Target&)
{
if constexpr (TestRootFsmParameter)
{
static_assert(std::is_same_v<Fsm,RootSm>);
}
return true;
}
};
// Forward-declare the upper machine,
// so we can set a root_sm.
struct UpperMachine_;
struct SmConfig;
using RootSm = state_machine<UpperMachine_, SmConfig>;
struct SmConfig : state_machine_config
{
using root_sm = RootSm;
using fsm_parameter = mp11::mp_if_c<TestRootFsmParameter,
root_sm,
transition_owner
>;
};
template<typename T>
struct MachineBase_ : public state_machine_def<MachineBase_<T>>
{
template <typename Event, typename Fsm>
void on_entry(const Event& /*event*/, Fsm& fsm)
{
if constexpr (TestRootFsmParameter)
{
static_assert(std::is_same_v<Fsm,RootSm>);
}
fsm.get_root_sm().machine_entries++;
};
template <typename Event, typename Fsm>
void on_exit(const Event& /*event*/, Fsm& fsm)
{
if constexpr (TestRootFsmParameter)
{
static_assert(std::is_same_v<Fsm,RootSm>);
}
fsm.get_root_sm().machine_exits++;
};
using initial_state = Default;
};
struct LowerMachine_ : public MachineBase_<LowerMachine_>
{
template <typename Event, typename Fsm>
void on_entry(const Event& /*event*/, Fsm& fsm)
{
if constexpr (TestRootFsmParameter)
{
static_assert(std::is_same_v<Fsm,RootSm>);
}
else
{
// TODO:
// Requires improved filtering of possible entry
// states.
// static_assert(std::is_same_v<Fsm,MiddleMachine>);
}
fsm.get_root_sm().machine_entries++;
};
template <typename Event, typename Fsm>
void on_exit(const Event& /*event*/, Fsm& fsm)
{
if constexpr (TestRootFsmParameter)
{
static_assert(std::is_same_v<Fsm,RootSm>);
}
else
{
// static_assert(std::is_same_v<Fsm,MiddleMachine>);
}
fsm.get_root_sm().machine_exits++;
};
};
using LowerMachine = state_machine<LowerMachine_, SmConfig>;
struct MiddleMachine_ : public MachineBase_<MiddleMachine_>
{
using transition_table = mp11::mp_list<
Row< Default , TriggerAction , none , Action , none >,
Row< Default , TriggerActionWithGuard , none , Action , Guard >,
Row< Default , EnterSubFsm , LowerMachine >,
Row< LowerMachine , ExitSubFsm , Default >
>;
};
using MiddleMachine = state_machine<MiddleMachine_, SmConfig>;
struct UpperMachine_ : public MachineBase_<UpperMachine_>
{
using transition_table = mp11::mp_list<
Row< Default , EnterSubFsm , MiddleMachine>,
Row< MiddleMachine , ExitSubFsm , Default>
>;
uint32_t machine_entries = 0;
uint32_t machine_exits = 0;
};
using UpperMachine = state_machine<UpperMachine_, SmConfig>;
};
using TestMachines = boost::mpl::vector<
hierarchical_machine<false>,
hierarchical_machine<true>
>;
BOOST_AUTO_TEST_CASE_TEMPLATE( backmp11_root_sm_test, TestMachine, TestMachines )
{
using UpperMachine = typename TestMachine::UpperMachine;
UpperMachine upper_machine{};
upper_machine.start();
BOOST_REQUIRE(upper_machine.machine_entries == 1);
upper_machine.process_event(EnterSubFsm());
BOOST_REQUIRE(upper_machine.machine_entries == 2);
upper_machine.process_event(TriggerAction());
upper_machine.process_event(TriggerActionWithGuard());
upper_machine.process_event(EnterSubFsm());
BOOST_REQUIRE(upper_machine.machine_entries == 3);
upper_machine.process_event(ExitSubFsm());
BOOST_REQUIRE(upper_machine.machine_exits == 1);
upper_machine.process_event(ExitSubFsm());
BOOST_REQUIRE(upper_machine.machine_exits == 2);
upper_machine.stop();
BOOST_REQUIRE(upper_machine.machine_exits == 3);
}
} // namespace
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