晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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#ifndef GREENLET_EXCEPTION_STATE_CPP
#define GREENLET_EXCEPTION_STATE_CPP

#include <Python.h>
#include "TGreenlet.hpp"

namespace greenlet {


ExceptionState::ExceptionState()
{
    this->clear();
}

void ExceptionState::operator<<(const PyThreadState *const tstate) noexcept
{
    this->exc_info = tstate->exc_info;
    this->exc_state = tstate->exc_state;
}

void ExceptionState::operator>>(PyThreadState *const tstate) noexcept
{
    tstate->exc_state = this->exc_state;
    tstate->exc_info =
        this->exc_info ? this->exc_info : &tstate->exc_state;
    this->clear();
}

void ExceptionState::clear() noexcept
{
    this->exc_info = nullptr;
    this->exc_state.exc_value = nullptr;
#if !GREENLET_PY311
    this->exc_state.exc_type = nullptr;
    this->exc_state.exc_traceback = nullptr;
#endif
    this->exc_state.previous_item = nullptr;
}

int ExceptionState::tp_traverse(visitproc visit, void* arg) noexcept
{
    Py_VISIT(this->exc_state.exc_value);
#if !GREENLET_PY311
    Py_VISIT(this->exc_state.exc_type);
    Py_VISIT(this->exc_state.exc_traceback);
#endif
    return 0;
}

void ExceptionState::tp_clear() noexcept
{
    Py_CLEAR(this->exc_state.exc_value);
#if !GREENLET_PY311
    Py_CLEAR(this->exc_state.exc_type);
    Py_CLEAR(this->exc_state.exc_traceback);
#endif
}


}; // namespace greenlet

#endif // GREENLET_EXCEPTION_STATE_CPP