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C++内存管理详解

2008-06-01 02:08:15 编辑來源:互联网 国际版 评论
 
 
本文为【C++内存管理详解】的汉字拼音对照版显示拼音
  1.duiyingdenewhedeleteyaocaiyongxiangtongdexingshi xiamiandeyujuyoushenmecuo

  string *stringarray = new string[100];

  ...

  delete stringarray;

  yiqiehaoxiangdoujingranyouxuyigenewduiyingzheyigedeleteranerqueyincangzhehendadecuowuchengxudeyunxingqingkuangjiangshibukecaicedezhishaostringarrayzhixiangde100gestringduixiangzhongde99gebuhuibeizhengquedicuihuiyinweitamendexigouhanshuyongyuanbuhuibeitiaoyong

  yongnewdeshihouhuifashengliangjianshishouxianneicunbeifenpei(tongguooperator new hanshuxiangjiantiaokuan7-10hetiaokuanm8)ranhouweibeifenpeideneicuntiaoyongyigehuoduogegouzaohanshuyongdeletedeshihouyeyouliangjianshifashengshouxianweijiangbeishifangdeneicuntiaoyongyigehuoduogexigouhanshuranhoushifangneicun(tongguooperator delete hanshuxiangjiantiaokuan8hem8)duiyu deletelaishuohuiyouzheyangyigechongyaodewentineicunzhongyouduoshaogeduixiangyaobeishanchudaanjuedinglejiangyouduoshaogexigouhanshuhuibeitiaoyong

  zhegewentijiandanlaishuojiushiyaobeishanchudezhizhenzhixiangdeshidangeduixiangnehuanshiduixiangshuzuzhezhiyounilaigaosudeletejiarunizaiyongdeleteshimeiyongkuohaodeletejiuhuirenweizhixiangdeshidangeduixiangfouzetajiuhuirenweizhixiangdeshiyigeshuzu

  string *stringptr1 = new string;

  string *stringptr2 = new string[100];

  ...

  delete stringptr1;// shanchuyigeduixiang

  delete [] stringptr2;// shanchuduixiangshuzu

  jiarunizaistringptr1qianjiale"[]"huizenyangnedaanshinajiangshibukecaicedejiarunimeizaistringptr2qianmeijiashang"[]"youhuizenyangnedaanyeshibukecaiceerqieduiyuxiangintzheyangdegudingleixinglaishuojieguoyeshibukecaicedeji使shizheyangdeleixingmeiyouxigouhanshusuoyijiejuezheleiwentideguizehenjiandanjiarunitiaoyong newshiyongle[]tiaoyongdeleteshiyeyaoyong[]jiarutiaoyongnewshimeiyouyong[]natiaoyongdeleteshiyebuyaoyong[]

  zaixieyigebaohanzhizhenshujuchengyuanbingqietigongduogegouzaohanshudeleishilaojizheyiguizeyouqichongyaoyinweizheyangdehuanijiubixuzaisuoyouchushihuazhizhenchengyuandegouzaohanshulicaiyongxiangtongdenewdexingshifouzexigouhanshulijiangcaiyongshenmexingshidedeleteneguanyuzheyihuatidejinyibuchanshushenjiantiaokuan11

  zhegeguizeduixihuanyongtypedefderenlaishuoyehenchongyaoyinweixietypedefdechengxuyuanbixugaosubierenyongnewchuangjianleyigetypedefdingyideleixingdeduixianghougaiyongshenmexingshidedeletelaishanchujuliruxia

  typedef string addresslines[4]; //yigerendedizhigong4xingmeixingyigestring

  //yinweiaddresslinesshigeshuzu使shiyongnew:

  string *pal = new addresslines; // zhuchong"new addresslines"fanhuistring*, he

  // "new string[4]"fanhuideyiyang

  deleteshibixuyishuzuxingshiyuzhiduiying

  delete pal;// cuowu!

  delete [] pal;// zhengque

  weilebimianhunluanzuihaodujueduishuzuleixingyongtypedefszheqishihenqingyiyinweibiaozhunc++ku(jiantiaokuan49)baohanyoustirnghevectormoban使shiyongtamenjianghui使shiduishuzudexuqiujianshaodaojihulingjulilaishuoaddresslineskeyidingyiweiyigezifuchuan(string)dexiangliang(vector)ji addresslineskedingyiweivectorleixing

  2.xigouhanshuliduizhizhenchengyuantiaoyongdelete

  daduoshuqingkuangxiazhixingdongtaineicunfenpeidedeleidouzaigouzaohanshuliyongnewfenpeineicunranhouzaixigouhanshuliyongdeleteshifangneicunzuichuxiezhegeleideshihoudangranbunanzuonihuijidezuihouduizaisuoyougouzaohanshulifenpeileneicundesuoyouchengyuan使shiyongdelete

  ranerzhegeleijingguoweihushengjihouqingkuangjiuhuibiandekunnanleyinweiduileidedaimajinxingxiugaidechengxuyuanbuyidingjiushizuizaoxiezhegeleiderenerzengjiayigezhizhenchengyuanyiweizhejihudouyaojinxingxiamiandegongzuo

  ·zaimeigegouzaohanshuliduizhizhenjinxingchushihuaduiyuyixiegouzaohanshujiarumeiyouneicunyaofenpeigeizhizhendehuazhizhenyaobeichushihuawei0(jikongzhizhen)

  ·shanchuxianyoudeneicuntongguofuzhicaozuofufenpeigeizhizhenxindeneicun

  ·zaixigouhanshulishanchuzhizhen

  jiaruzaigouzaohanshuliwanglechushihuamougezhizhenhuozhezaifuzhicaozuodeguochengzhongwanglechulitawentihuichuxiandehenkuaihenmingxiansuoyizaishijianzhongzhelianggewentibuhuinamezhemonidanshijiaruzaixigouhanshulimeiyoushanchuzhizhentabuhuibiaoxianchuhenmingxiandewaibuzhengzhuangxiangfantakenengzhishibiaoxianweiyidianweixiaodeneicunxielubingqiebuduanzengchangzuihoutunshilenidedizhikongjiandaozhichengxuyaozheyinweizhezhongqingkuangjingchangbunameyinrenzhuchongsuoyimeizengjiayigezhizhenchengyuandaoleilishiyidingyaojiqingchu

  lingwaishanchukongzhizhenshianquande(yinweitashenmeyemeizuo)suoyizaixiegouzaohanshufuzhicaozuofuhuoqitachengyuanhanshushileidemeigezhizhenchengyuanyaomezhixiangyouxiaodeneicunyaomejiuzhixiangkongnazainidexigouhanshulinijiukeyizhiyongjiandandideletediaotamenerbuyongdanxintamenshibushibeinewguo

  dangranduibentiaokuande使shiyongyebuyaojueduilirunidangranbuhuiyongdeletequshanchuyigemeiyouyongnewlaichushihuadezhizhenerqiejiuxiangyongzhinengzhizhenduixiangshibuyonglaoniqushanchuyiyangniyeyongyuanbuhuiqushanchuyigechuandigeinidezhizhenhuanjuhuashuochufeileichengyuanzuichuyonglenew,fouzeshibuyongzaixigouhanshuliyongdeletede

  shuodaozhinengzhizhenzhelijieshaoyizhongbimianbixushanchuzhizhenchengyuandefangfajibazhexiechengyuanyongzhinengzhizhenduixianglaidaitibiruc++biaozhunkulideauto_ptrxiangzhidaotashiruhegongzuodekankantiaokuanm9hem10

  3.yuxianyubeihaoneicunbugoudeqingkuang

  operator newzaiwufawanchengneicunfenpeiqingqiushihuipaochuyichang(yiqiandezuofayibanshifanhui0yixiejiuyidiandebianyiqihuanzhemezuoniyuanyidehuayekeyibanidebianyiqishezhichengzheyangguanyuzhegehuatiwojiangtuichidaobentiaokuandejieyichutaolun)dajiadouzhidaochulineicunbugousuochanshengdeyichangzhenkeyisuandeshangshigedaodeshangdexingweidanshijizuoqilaiyouhuixiangdaojiazaibozishangnayangtongkusuoyiniyoushihuibuquguantayexuyizhimeiquguantadannixinliyidinghuanshishenshendiyincangzheyizhongzuieganwanyinewzhendechanshengleyichangzenmeban

  nihuihenzirandixiangdaochulizhezhongqingkuangdeyizhongfangfajihuidaoyiqiandelaolushangqu使shiyongyuchulilirucdeyizhongchangyongdezuofashidingyiyigeleixingwuguandehonglaifenpeineicunbingjianchafenpeishifouchenggongduiyuc++laishuozhegehongkanqilaikenengxiangzheyang

  

  

  #define new(ptr, type)

  try { (ptr) = new type; }

  catch (std::bad_alloc&) { assert(0); }

  manstd::bad_allocshizuoshenmedenihuiwenbad_allocshioperator newbunengmanzuneicunfenpeiqingqiushipaochudeyichangleixingstdshibad_allocsuozaidemingzikongjian(jiantiaokuan28)demingchenghaonihuijixuwenassertyouyoushenmeyongjiarunikankanbiaozhunctouwenjian(huoyutaxiangdengjiadeyongdaolemingzikongjiandebanbenjiantiaokuan49)jiuhuifaxianassertshigehongzhegehongjianchachuangeitadebiaodashishifoufeilingjiarubushifeilingzhijiuhuifachuyitiaochucuoxinxibingtiaoyongabortassertzhishizaimeidingyibiaozhunhongndebugdeshihoujizaitiaoshizhuangtaixiacaizhemezuozaichanpinfabuzhuangtaixiajidingyilendebugdeshihouassertshenmeyebuzuoxiangdangyuyitiaokongyujusuoyinizhinengzaitiaoshishicainengjianchaduanyan(assertion)

  newhongbudanyouzheshangmiansuoshuodetongbingjiyongassertqujianchakenengfashengzaiyifabuchengxulidezhuangtai(ranerrenheshihoudoukenengfashengneicunbugoudeqingkuang)tongshitahuanzaic ++liyoulingwaiyigequexiantameiyoukaolvdaonewyougezhonggeyangde使shiyongfangshiliruxiangchuangjianleixingtduixiangyibanyousanzhongchangjiandeyufaxingshinibixuduimeizhongxingshikenengchanshengdeyichangdouyaojinxingchuli

  new t;

  new t(constrUCtor arguments);

  new t[size];

  zheliduiwentidadajinxinglejianhuayinweiyourenhuanhuizidingyi(chongzai)operator newsuoyichengxulihuibaohanrenyige使shiyongnewdeyufaxingshi

  namezenmebanjiaruxiangyongyigehenjiandandechucuochulifangfakeyizhemezuodangneicunfenpeiqingqiubunengmanzushitiaoyongniyuxianzhidingdeyigechucuochulihanshuzhegefangfajiyuyigechangguijidangoperator newbunengmanzuqingqiushihuizaipaochuyichangzhiqiantiaoyongkehuzhidingdeyigechucuochulihanshuyibanchengweinew-handlerhanshu(operator newshijigongzuoqilaiyaofuduoyixiexiangjiantiaokuan8)

  zhidingchucuochulihanshushiyaoyongdaoset_new_handlerhanshutazaitouwenjianlidazhishixiangxiamianzheyangdingyide

  typedef void (*new_handler)();

  new_handler set_new_handler(new_handler p) throw();

  keyikandaonew_handlershiyigezidingyidehanshuzhizhenleixingtazhixiangyigemeiyoushurushenshuyemeiyoufanhuizhidehanshuset_new_handlerzeshiyigeshurubingfanhuinew_handlerleixingdehanshu

  set_new_handlerdeshurushenshushioperator newfenpeineicunshibaishiyaotiaoyongdechucuochulihanshudezhizhenfanhuizhishiset_new_handlermeitiaoyongzhiqianjiuyijingzaiqizuoyongdejiudechucuochulihanshudezhizhen

  keyixiangxiamianzheyang使shiyongset_new_handler

  // function to call if operator new can't allocate enough memory

  void nomorememory()

  {

  cerr << "unable to satisfy request for memory

  ";

  abort();

  }

  int main()

  {

  set_new_handler(nomorememory);

  int *pbigdataarray = new int[100000000];

  ...

  }

  jiaruoperator newbunengwei100,000,000gezhengshufenpeikongjiannomorememoryjianghuibeitiaoyongchengxufachuyitiaochucuoxinxihouzhongzhizhejiubijiandandirangxitongneigaichanshengcuowuxinxilaijieshuchengxuyaohao(shun便biankaolvyixiajiarucerrzaixiecuowuxinxideguochengzhongyaodongtaifenpeineicunnajianghuifashengshenme...)

  operator newbunengmanzuneicunfenpeiqingqiushinew-handlerhanshubuzhitiaoyongyiciershibuduanchongfuzhizhizhaodaozugoudeneicunshixianchongfutiaoyongdedaimazaitiaokuan8likeyikandaozheliwoyongmiaoshuxingdedeyuyanlaishuomingyigeshejidehaodenew-handlerhanshubixushixianxiamiangongnengzhongdeyizhong

  ·chanshenggengduodekeyongneicunzhejiang使shioperator newxiayicifenpeineicundechangshiyoukenenghuodechenggongshishizheyiceluedeyigefangfashizaichengxuqidongshifenpeiyigedadeneicunkuairanhouzaidiyicitiaoyongnew-handlershishifangshifangshibansuizheyixieduiyonghudejinggaoxinxiruneicunshuliangtaishaoxiaciqingqiukenenghuishibaichufeiyouyougengduodekeyongkongjian

  ·anzhuanglingyigebutongdenew-handlerhanshujiarudangqiandenew-handlerhanshubunengchanshenggengduodekeyongneicunkenengtahuizhidaolingyigenew- handlerhanshukeyitigonggengduodeziyuanzheyangdehuadangqiandenew-handlerkeyianzhuanglingyigenew-handlerlaiqudaita(tongguotiaoyong set_new_handler)xiayicioperator newtiaoyongnew-handlershihui使shiyongzuijinanzhuangdenage(zheyiceluedelingyigebiantongbanfashirangnew-handlerkeyigaibiantazijideyunxingxingweinamexiacitiaoyongshitajiangzuobutongdeshifangfashi使shinew-handlerkeyixiugainaxieyingxiangtazishenxingweidejingtaihuoquanjushuju)

  ·xiechunew-handleryejiushichuandikongzhizhengeiset_new_handlermeiyouanzhuangnew-handleroperator newfenpeineicunbuchenggongshijiuhuipaochuyigebiaozhundestd::bad_allocleixingdeyichang

  ·paochustd::bad_allochuocongstd::bad_allocjixudeqitaleixingdeyichangzheyangdeyichangbuhuibeioperator newbuzhuosuoyitamenhuibeisongdaozuichujinxingneicunqingqiudedifang(paochubiedebutongleixingdeyichanghuiweifanoperator newyichangguifanguifanzhongdequeshengxingweishitiaoyongabortsuoyinew-handleryaopaochuyigeyichangshiyidingyaoquexintashicongstd::bad_allocjixulaidexianggengduodilejieyichangguifanshenjiantiaokuanm14)

  ·meiyoufanhuidianxingzuofashitiaoyongaborthuoexitabort/exitkeyizaibiaozhunckuzhongzhaodao(huanyoubiaozhunc++kushenjiantiaokuan49)

  shangmiandexuanzegeilenishixiannew-handlerhanshujidadelinghuoxing

  chulineicunfenpeishibaideqingkuangshicaiqushenmefangfaqujueyuyaofenpeideduixiangdelei

  class x {

  public:

  static void

  

   outofmemory();

  ...

  };

  class y {

  public:

  static void outofmemory();

  ...

  };

  x* p1 = new x; // ruofenpeichenggongtiaoyongx::outofmemory

  y* p2 = new y; // ruofenpeibuchenggongtiaoyongy::outofmemory

  c++buzhichizhuanmenzhenduiyuleidenew-handlerhanshuerqieyebuxuyaonikeyizijilaishixiantazhiyaozaimeigeleizhongtigongzijibanbendeset_new_handlerheoperator newleideset_new_handlerkeyiweileizhidingnew-handler(jiuxiangbiaozhundeset_new_handlerzhidingquanjunew-handleryiyang)leideoperator newzebaozhengweileideduixiangfenpeineicunshiyongleidenew-handlerqudaiquanjunew-handler

  jiashechulileixneicunfenpeishibaideqingkuangyinweioperator newduileixingxdeduixiangfenpeineicunshibaishimeicidoubixutiaoyongchucuochulihanshusuoyiyaozaileilishengmingyigenew_handlerleixingdejingtaichengyuannameleixkanqilaihuixiangzheyang

  class x {

  public:

  static new_handler set_new_handler(new_handler p);

  static void * operator new(size_t size);

  private:

  static new_handler currenthandler;

  };

  leidejingtaichengyuanbixuzaileiwaidingyiyinweixiangjieyongjingtaiduixiangdequeshengchushihuazhi0suoyidingyix::currenthandlershimeiyouquchushihua

  new_handler x::currenthandler; //queshengshezhicurrenthandlerwei0(jinull)

  leixzhongdeset_new_handlerhanshuhuibaocunchuangeitaderenhezhizhenbingfanhuizaitiaoyongtazhiqiansuobaocunderenhezhizhenzhezhengshibiaozhunbanbendeset_new_handlersuozuode

  new_handler x::set_new_handler(new_handler p)

  {

  new_handler oldhandler = currenthandler;

  currenthandler = p;

  return oldhandler;

  }

  zuihoukankanxdeoperator newsuozuode

  1. tiaoyongbiaozhunset_new_handlerhanshushurushenshuweixdechucuochulihanshuzhe使shidexdenew-handlerhanshuchengweiquanjunew-handlerhanshuzhuchongxiamiandedaimazhongyongle"::"fuhaoxianshidiyinyongstdkongjian(biaozhunset_new_handlerhanshujiucunzaiyustdkongjian)

  2. tiaoyongquanjuoperator newfenpeineicunjiarudiyicifenpeishibaiquanjuoperator newhuitiaoyongxdenew-handleryinweitaganggang(jian1.)beianzhuangchengweiquanjunew-handlerjiaruquanjuoperator newzuizhongweinengfenpeidaoneicuntapaochustd::bad_allocyichangxdeoperator newhuibuzhuodaotaxdeoperator newranhouhuifuzuichubeiqudaidequanjunew-handlerhanshuzuihouyipaochuyichangfanhui

  3. jiashequanjuoperator newweileixingxdeduixiangfenpeineicunchenggong, xdeoperator newhuizaicitiaoyongbiaozhunset_new_handlerlaihuifuzuichudequanjuchucuochulihanshuzuihoufanhuifenpeichenggongdeneicundezhizhen

  c++shizhemezuode

  void * x::operator new(size_t size)

  {

  new_handler globalhandler = // anzhuangxdenew_handler

  std::set_new_handler(currenthandler);

  void *memory;

  try { // changshifenpeineicun

  memory = ::operator new(size);

  }

  catch (std::bad_alloc&) { // huifujiudenew_handler

  std::set_new_handler(globalhandler);

  throw; // paochuyichang

  }

  std::set_new_handler(globalhandler); // huifujiudenew_handler

  return memory;

  }

  jiaruniduishangmianchongfutiaoyongstd::set_new_handlerkanbushunyankeyishenjiantiaokuanm9laichuqutamen

  使shiyongleixdeneicunfenpeichuligongnengshidazhiruxia

  void nomorememory();// xdeduixiangfenpeineicunshibaishitiaoyongdenew_handlerhanshudeshengming

  x::set_new_handler(nomorememory);

  // banomorememoryshezhiweixde

  // new-handlinghanshu

  x *px1 = new x;

  // runeicunfenpeishibai

  // tiaoyongnomorememory

  string *ps = new string;

  // runeicunfenpeishibaitiaoyongquanjunew-handlinghanshu

  x::set_new_handler(0);

  // shexdenew-handlinghanshuweikong

  x *px2 = new x;

  // runeicunfenpeishibailijipaochuyichang

  // (leixmeiyounew-handlinghanshu)

  nihuizhuchongdaochuliyishangleisiqingkuangjiarubukaolvleidehuashixiandaimashiyiyangdezhejiuhenzirandixiangdaozaibiededifangyenengchongyongtamenzhengrutiaokuan41suoshuomingdejixuhemobankeyiyonglaishejikechongyongdaimazaizheliwomenbaliangzhongfangfajieheqilai使shiyongcongermanzulenideyaoqiu

  nizhiyaochuangjianyigehunhefengge(mixin-style)dejileizhezhongjileidayingzileijixutamouyitedingdegongnengzhelizhideshijianliyigeleidenew-handlerdegongnengzhisuoyishejiyigejileishiweilerangsuoyoudezileikeyijixuset_new_handlerheoperator newgongnengershejimobanshiweile使shimeigezileiyoubutongdecurrenthandlershujuchengyuanzhetingqilaihenfuduobuguonihuikandaodaimaqishihenshuxiqubiezhibuguoshitaxianzaikeyibeirenheleichongyongle

  template // tigongleiset_new_handlerzhichide

  class newhandlersupport { // hunhefenggedejilei

  public:

  static new_handler set_new_handler(new_handler p);

  

   static void * operator new(size_t size);

  private:

  static new_handler currenthandler;

  };

  template

  new_handler newhandlersupport::set_new_handler(new_handler p)

  {

  new_handler oldhandler = currenthandler;

  currenthandler = p;

  return oldhandler;

  }

  template

  void * newhandlersupport::operator new(size_t size)

  {

  new_handler globalhandler =

  std::set_new_handler(currenthandler);

  void *memory;

  try {

  memory = ::operator new(size);

  }

  catch (std::bad_alloc&) {

  std::set_new_handler(globalhandler);

  throw;

  }

  std::set_new_handler(globalhandler);

  return memory;

  }

  // this sets each currenthandler to 0

  template

  new_handler newhandlersupport::currenthandler;

  youlezhegemobanleiduileixjiashangset_new_handlergongnengjiuhenjiandanlezhiyaorangxcongnewhandlersupportjixu

  // note inheritance from mixin base class template. (see

  // my article on counting objects for information on why

  // private inheritance might be preferable here.)

  class x: public newhandlersupport {

  ... // as before, but no declarations for

  }; // set_new_handler or operator new

  使shiyongxdeshihouyiranbuyonglihuitamuhouzaizuoxieshenmelaodaimayirangongzuozhehenhaonaxienichangbuqulihuidedong西xiwangwangshizuikexinlaide

  使shiyongset_new_handlershichulineicunbugouqingkuangxiayizhongfang便bianjiandandefangfazhebibameigenewdoubaozhuangzaitrymokuailidangranhaoduoleerqie newhandlersupportzheyangdemoban使shidexiangrenheleizengjiayigetedingdenew-handlerbiandegengjiandanhunhefenggedejixubukebimiandijianghuatiyinrudaoduojixushangquzaizhuandaozhegehuatiqianniyidingyaoxianyuedutiaokuan43

  1993nianqianc++yizhiyaoqiuzaineicunfenpeishibaishioperator newyaofanhui0xianzaizeshiyaoqiuoperator newpaochustd::bad_allocyichanghenduoc++chengxushizaibianyiqikaishizhichixinguifanqianxiedec++biaozhunweiyuanhuibuxiangfangqinaxieyiyoudezunxunfanhui0guifandedaimasuoyitamentigonglelingwaixingshideoperator new(yijioperator new[]jiantiaokuan8)yijixutigongfanhui0gongnengzhexiexingshibeichengweiwupaochuyinweitamenmeiyongguoyigethrowershizai使shiyongnewderukoudiancaiyonglenothrowduixiang

  class widget { ... };

  widget *pw1 = new widget;// fenpeishibaipaochustd::bad_alloc if

  if (pw1 == 0) ... // zhegejianchayidingshibai

  widget *pw2 = new (nothrow) widget; // ruofenpeishibaifanhui0

  if (pw2 == 0) ... // zhegejianchakenenghuichenggong

  buguanshiyongzhenggui(jipaochuyichang)xingshidenewhuanshiwupaochuxingshidenewchongyaodeshinibixuweineicunfenpeishibaizuohaoyubeizuijiandandefangfashi使shiyongset_new_handleryinweitaduiliangzhongxingshidouyouyong

  4.xieoperator newheoperator deleteshiyaozunxunchanggui

  zijichongxieoperator newshi(tiaokuan10jieshileweishenmeyoushiyaochongxieta)henchongyaodeyidianshihanshutigongdexingweiyaohexitongqueshengdeoperator newyizhishijizuoqilaiyejiushiyaoyouzhengquedefanhuizhikeyongneicunbugoushiyaotiaoyongchucuochulihanshu(jiantiaokuan7)chulihao0zijieneicunqingqiudeqingkuangciwaihuanyaobimianbuxiaoxinyincanglebiaozhunxingshidenewbuguozheshitiaokuan9dehuati

  youguanfanhuizhidebufenhenjiandanjiaruneicunfenpeiqingqiuchenggongjiufanhuizhixiangneicundezhizhenjiarushibaizezunxuntiaokuan7deguidingpaochuyigestd::bad_allocleixingdeyichang

  danshiqingyebushinamejiandanyinweioperator newshijishanghuibuzhiyicidichangshizhequfenpeineicuntayaozaimeicishibaihoutiaoyongchucuochulihanshuhuanqiwangchucuochulihanshunengxiangbanfashifangbiechudeneicunzhiyouzaizhixiangchucuochulihanshudezhizhenweikongdeqingkuangxiaoperator newcaipaochuyichang

  lingwaic++biaozhunyaoqiuji使shizaiqingqiufenpei0zijieneicunshioperator newyeyaofanhuiyigehefazhizhen(shijishangzhegetingqilaiguaiguaideyaoqiuqueshigeic++yuyanqitadifangdailailejian便bian)

  zheyangfeileichengyuanxingshideoperator newdeweidaimakanqilaihuixiangxiamianzheyang

  void * operator new(size_t size) // operator newhuankenengyouqitashenshu

  {

  if (size == 0) { // chuli0zijieqingqiushi

  size = 1; // batadangzuo1gezijieqingqiulaichuli

  }

  while (1) {

  fenpeisizezijieneicun;

  if (fenpeichenggong)

  return (zhixiangneicundezhizhen);

  // fenpeibuchenggongzhaochudangqianchucuochulihanshu

  new_handler globalhandler = set_new_handler(0);

  set_new_handler(globalhandler);

  if (globalhandler) (*globalhandler)();

  else throw std::bad_alloc();

  }

  }

  chulilingzijieqingqiudejiqiaozaiyubatazuoweiqingqiuyigezijielaichulizhekanqilaiyehenguaidanjiandanhefayouxiaoerqieniyouhuiduojiupengdaoyicilingzijieqingqiudeqingkuangne

  niyouhuixiqishangmiandeweidaimazhongweishenmebachucuochulihanshuzhiwei0houyoulijihuifuzheshiyinweimeiyoubanfakeyizhijiededaochucuochulihanshudezhizhensuoyibixutongguotiaoyongset_new_handlerlaizhaodaobanfahenbendanyeyouxiao

  

  

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