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<h1 class="article_title">c++11涓殑move涓巉orward</h1>
<div class="article_author">娣誨姞鏃墮棿錛?016-12-20 17:10:14 鏂囩珷浣滆�咃細<a href="/">嫻庡崡杞歡寮�鍙?/a> 嫻忚嬈℃暟錛?Script Language="Javascript" Src="/item/GetHits.asp?Action=Count&GetFlag=0&m=1&ID=3063"></Script></div>
<div class="article_main"><div id="MyContent"><p style="margin-top: 0px; margin-bottom: 0px; padding: 15px 0px 0px; line-height: 30px; font-family: 瀹嬩綋; color: rgb(51, 51, 51); font-size: 13.3333px; white-space: normal; background-color: rgb(241, 241, 241);"><strong style="margin: 0px; padding: 0px;">涓�. move</strong></p><p>鍏充簬lvaue鍜宺value, 鍦╟++11浠ュ墠瀛樺湪涓�涓湁瓚ｇ殑鐜拌薄錛歍& 鎸囧悜lvalue錛?const T&鍗沖彲浠ユ寚鍚憀value涔熷彲浠ユ寚鍚憆value銆?/p><p> </p><p>浣嗗氨鏄病鏈変竴縐嶅紩鐢ㄧ被鍨嬶紝鍙互闄愬埗涓哄彧鎸囧悜rvalue.</p><p> </p><p>榪欎箥璧鋒潵濂藉儚涔熶笉鏄緢澶ч棶棰橈紝浣嗕簨瀹炰笂榪欎釜緙洪櫡鍦ㄦ湁浜涙椂鍊欎弗閲嶇殑闄愬埗浜嗘垜浠湪鏌愪簺鎯呭喌涓嬶紝鍐欏嚭鏇存湁鏁堢巼鐨勪唬鐮併�?/p><p> </p><p>涓句釜綺熷瓙錛屽亣璁炬垜浠湁涓�涓被錛屽畠鍖呭惈浜嗕竴浜涜祫婧愶細</p><p> </p><p>澶嶅埗浠ｇ爜</p><p>class holder</p><p>{</p><p> public:</p><p> </p><p> holder()</p><p> {</p><p> resource_ = new Resource();</p><p> }</p><p> ~holder()</p><p> {</p><p> delete resource_;</p><p> }</p><p> </p><p> holder(const holder& other)</p><p> {</p><p> resource_ = new Resource(*other.resource_);</p><p> }</p><p> </p><p> holder(holder& other)</p><p> {</p><p> resource_ = new Resource(*other.resource_);</p><p> }</p><p> </p><p> holder& operator=(const holder& other)</p><p> {</p><p> delete resource_;</p><p> resource_ = new Resource(*other.resource_);</p><p> return *this;</p><p> }</p><p> holder& operator=(holder& other)</p><p> {</p><p> delete resource_;</p><p> resource_ = new Resource(*other.resource_);</p><p> return *this;</p><p> }</p><p> private:</p><p> </p><p> Resource* resource_;</p><p>};</p><p>澶嶅埗浠ｇ爜</p><p> </p><p> </p><p>榪欐槸涓猂AII鐨勭被錛屾瀯閫犲嚱鏁頒笌鏋愭瀯鍑芥暟鍒嗗埆璐熻矗璧勬簮鐨勮幏鍙栦笌閲婃斁錛屽洜姝や篃鐩稿簲澶勭悊浜嗘嫹璐濇瀯閫犲嚱鏁?copy constructor)鍜岄噸杞借祴鍊兼搷浣滅(assignment operator)銆?/p><p> </p><p>鐜板湪鍋囪鎴戜滑榪欐牱鏉ヤ嬌鐢ㄨ繖涓被銆?/p><p> </p><p>// 鍋囪瀛樺湪濡備竴涓嚱鏁幫紝榪斿洖鍊間負holder綾誨瀷</p><p>holder get_holder();</p><p> </p><p>holder h;</p><p> </p><p>h = get_holder();</p><p>榪欏皬孌典唬鐮佺殑鏈�鍚庝竴鏉¤鍙ュ仛浜?浠朵簨鎯咃細</p><p> </p><p>1) 閿�姣乭涓殑璧勬簮銆?/p><p> </p><p>2) 鎷風敱get_holder()榪斿洖鐨勮祫婧愩�?/p><p> </p><p>3) 閿�姣乬et_holder()榪斿洖鐨勮祫婧愩�?/p><p> </p><p>鎴戜滑鏄劇劧鍙互鍙戠幇榪欏叾涓仛浜嗕簺涓嶆槸寰堟湁蹇呰鐨勪簨鎯咃紝鍋囧鎴戜滑鍙互鐩存帴浜ゆ崲h涓殑璧勬簮涓巊et_holder()榪斿洖鐨勮祫婧愶紝閭ｈ繖鏍鋒垜浠彲浠ョ洿鎺ョ渷鎺夌浜屾涓殑鎷瘋礉鍔ㄤ綔浜嗐�?/p><p> </p><p>鑰岃繖閲屼箣鎵�浠ヤ氦鎹㈣兘杈懼埌鐩稿悓鐨勬晥鏋滐紝鏄洜涓篻et_holder()榪斿洖鐨勬槸涓存椂鐨勫彉閲忥紝鏄釜rvalue錛屽畠鐨勭敓鍛藉懆鏈熼�氬父鏉ヨ寰堢煭錛屽叿浣撳湪榪欓噷錛屽氨鏄祴鍊艱鍙ュ畬鎴愪箣鍚庯紝浠諱綍浜洪兘娌℃硶鍐嶅紩鐢ㄨrvalue錛屽畠椹笂灝辮琚攢姣佷簡銆?/p><p> </p><p>濡傛灉鏄儚涓嬮潰榪欐牱鐨勭敤娉曪紝鎴戜滑鏄劇劧涓嶅彲浠ョ洿鎺ヤ氦鎹袱鑰呯殑璧勬簮錛?/p><p> </p><p>holder h1;</p><p>holder h2;</p><p> </p><p>h1 = h2;</p><p>鍥犱負h2鏄釜lvalue錛屽畠鐨勭敓鍛藉懆鏈熻緝闀匡紝鍦ㄨ祴鍊艱鍙ョ粨鏉熶箣鍚庯紝鍙橀噺榪樿瀛樺湪錛岃繕鏈夊彲鑳借琚埆鐨勫湴鏂逛嬌鐢ㄣ�?/p><p> </p><p>鏄劇劧錛宺value鐨勭煭鐢熷懡鍛ㄦ湡緇欐垜浠彁渚涗簡鍦ㄦ煇浜涙儏鍐典紭鍖栦唬鐮佺殑鍙兘銆?/p><p> </p><p>浣嗚繖縐嶅彲鑳藉湪c++11浠ュ墠鏄病娉曞埄鐢ㄥ埌鐨勶紝鍥犱負錛氭垜浠病娉曞湪浠ｇ爜涓rvalue鍖哄埆瀵瑰緟錛屽湪鍑芥暟浣撲腑錛屾棤娉曞垎杈ㄤ紶榪涙潵鐨勫弬鏁板埌搴曟槸涓嶆槸rvalue錛岀己灝戜竴涓猺value鐨勬爣璁般�?/p><p> </p><p>鍥炲繂涓�涓?T& 鎸囧悜鐨勬槸lvalue錛岃�宑onst T&鎸囧悜鐨勶紝鍗村彲鑳芥槸lvalue鎴杛value錛屾病娉曞尯鍒嗭紒</p><p> </p><p>涓轟簡瑙ｅ喅榪欎釜闂錛宑++11涓紩鍏ヤ簡涓�涓柊鐨勫紩鐢ㄧ被鍨嬶細T&&</p><p> </p><p>榪欑寮曠敤鎸囧悜鐨勫彉閲忔槸涓猺value錛?鏈変簡榪欎釜寮曠敤綾誨瀷錛屾垜浠墠闈㈡彁鍒扮殑闂灝辮繋鍒冭�岃В浜嗐�?/p><p> </p><p>澶嶅埗浠ｇ爜</p><p>class holder</p><p>{</p><p> public:</p><p> </p><p> holder()</p><p> {</p><p> resource_ = new Resource();</p><p> }</p><p> ~holder()</p><p> {</p><p> if (resource_) delete resource_;</p><p> }</p><p> </p><p> holder(const holder& other)</p><p> {</p><p> resource_ = new Resource(*other.resource_);</p><p> }</p><p> </p><p> holder(holder& other)</p><p> {</p><p> resource_ = new Resource(*other.resource_);</p><p> }</p><p> </p><p> holder(holder&& other)</p><p> {</p><p> resource_ = other.resource_;</p><p> other.resource_ = NULL;</p><p> }</p><p> </p><p> holder& operator=(const holder& other)</p><p> {</p><p> delete resource_;</p><p> resource_ = new Resource(*other.resource_);</p><p>銆�銆�銆�銆�銆�銆�銆�銆�銆� return *this;</p><p> }</p><p> </p><p> holder& operator=(holder& other)</p><p> {</p><p> delete resource_;</p><p> resource_ = new Resource(*other.resource_);</p><p> return *this;</p><p> }</p><p> </p><p> holder& operator=(holder&& other)</p><p> {</p><p> std::swap(resource_, other.resource_);</p><p> return *this;</p><p> }</p><p> </p><p> private:</p><p> </p><p> Resource* resource_;</p><p>}; </p><p>澶嶅埗浠ｇ爜</p><p>榪欐椂鎴戜滑鍐嶅啓濡備笅浠ｇ爜鐨勬椂鍊欙細</p><p> </p><p>holder h1;</p><p>holder h2;</p><p> </p><p>h1 = h2; //璋冪敤operator(holder&);</p><p>h1 = get_holder(); //璋冪敤operator(holder&&)</p><p>鏄劇劧鍚庨潰鐨勫疄鐜版槸鏇撮珮鏁堢殑銆?/p><p> </p><p> </p><p> </p><p>鍐欏埌閲岋紝鏈夌殑浜轟篃璁告彁鍑洪棶棰? T&& ref 鎸囧悜鐨勬槸鍙沖�鹼紝閭ef鏈韓鏄乏鍊艱繕鏄彸鍊鹼紵鍏蜂綋鏉ヨ灝辨槸錛?/p><p> </p><p>1 holder& operator=(holder&& other)</p><p>2 {</p><p>3 holder h = other;//榪欓噷璋冪敤鐨勬槸operator=(holder&) 榪樻槸operator=(holder&&)?</p><p>4 return *this;</p><p>5 }</p><p>榪欎釜闂鐨勬湰璐ㄨ繕鏄�庝箞鍖哄垎rvalue錛?/p><p> </p><p>c++11涓rvalue浣滀簡鏄庣‘鐨勫畾涔夛細</p><p> </p><p>Things that are declared as rvalue reference can be lvalues or rvalues. The distinguishing criterion is: if it has a name, then it is an lvalue. Otherwise, it is an rvalue.</p><p>濡傛灉涓�涓彉閲忔湁鍚嶅瓧錛屽畠灝辨槸lvalue,鍚﹀垯錛屽畠灝辨槸rvalue銆?/p><p> </p><p>鏍規嵁榪欐牱鐨勫畾涔夛紝涓婇潰鐨勯棶棰樹腑錛宱ther鏄湁鍚嶅瓧鐨勫彉閲忥紝鍥犳鏄釜lvalue,鍥犳絎?琛岃皟鐢ㄧ殑鏄痮perator=(holder&).</p><p> </p><p> </p><p> </p><p>濂戒簡璇磋繖涔堜箙錛屼竴鐩存病璇村埌move()錛岀幇鍦ㄦ垜浠潵緇欏嚭瀹氫箟錛?/p><p> </p><p>c++11涓殑move()鏄繖鏍蜂竴涓嚱鏁幫紝瀹冩帴鍙椾竴涓弬鏁幫紝鐒跺悗榪斿洖涓�涓鍙傛暟瀵瑰簲鐨剅value().</p><p>灝辮繖涔堢畝鍗曪紒浣犵敋鑷沖彲浠ユ殏鏃舵兂鍍忓畠鐨勫師鍨嬫槸榪欐牱鐨?褰撶劧鏄敊鐨勶紝姝ｇ‘鐨勫師鍨嬫垜浠悗闈㈠啀璁?</p><p> </p><p>T&& move(T& val);</p><p> </p><p> </p><p>閭ｄ箞錛岃繖鏍蜂竴涓猰ove()錛屽畠鏈変粈涔堜嬌鐢ㄥ憿錛熺敤澶勫ぇ浜嗭紒</p><p> </p><p>鍓嶉潰鐢ㄥ埌浜唖td::swap()榪欎釜鍑芥暟錛屽洖鎯充竴涓嬩互鍓嶆垜浠槸鎬庝箞鎯蟲潵瀹炵幇swap鐨勫憿錛?/p><p> </p><p>1 void swap(T& a, T& b)</p><p>2 {</p><p>3 T tmp = a;</p><p>4 a = b;</p><p>5 b = tmp;</p><p>6 }</p><p>鎯沖儚涓�涓嬶紝濡傛灉T鏄垜浠箣鍓嶅畾涔夌殑holder錛岃繖閲岄潰澶氬仛浜嗗灝戞棤鐢ㄥ姛鍟婏紝姣忎竴涓祴鍊艱鍙ワ紝灝辨湁涓�嬈¤祫婧愰攢姣侊紝浠ュ強涓�嬈℃嫹璐濓紒浣嗗鏋滅敤涓婁簡move().</p><p> </p><p>1 void swap(T& a, T& b)</p><p>2 {</p><p>3 T tmp=move(a);</p><p>4 a = move(b);</p><p>5 b = move(tmp);</p><p>6 }</p><p>榪欐牱涓�鏉ワ紝濡傛灉holder鎻愪緵浜唎perator=(T&&)閲嶈澆, 涓婅堪鎿嶄綔灝卞畬鍏ㄥ彧鏄氦鎹簡3嬈℃寚閽堬紝鏁堢巼澶уぇ鎻愬崌錛?/p><p> </p><p>move浣垮緱紼嬪簭鍛樺湪鏈夐渶瑕佺殑鎯呭喌涓嬶紝鑳藉鎶妉value褰撴垚rvalue鏉ヤ嬌鐢ㄣ�?/p><p> </p><p> </p><p> </p><p><strong style="margin: 0px; padding: 0px;">浜? forward()</strong></p><p>1.杞彂闂</p><p>闄や簡move()璇箟涔嬪錛宺value鐨勬彁鍑鴻繕涓轟簡瑙ｅ喅鍙︿竴涓棶棰橈細杞彂(forward).</p><p> </p><p>鍋囪鎴戜滑鏈夎繖鏍蜂竴涓ā鏉垮嚱鏁幫紝瀹冪殑浣滅敤鏄細緙撳瓨涓�浜沷bject錛屽繀瑕佺殑鏃跺�欙紝鍒涘緩鏂扮殑銆?/p><p> </p><p>澶嶅埗浠ｇ爜</p><p>template<class TYPE, class ARG></p><p>TYPE* acquire_obj(ARG arg)</p><p>{</p><p> static list<TYPE*> caches;</p><p> TYPE* ret;</p><p> </p><p> if (!caches.empty())</p><p> {</p><p> ret = caches.pop_back();</p><p> ret->reset(arg);</p><p> return ret;</p><p> }</p><p> </p><p> ret = new TYPE(arg);</p><p> return ret;</p><p>}</p><p>澶嶅埗浠ｇ爜</p><p>榪欎釜妯℃澘鍑芥暟鐨勪綔鐢ㄧ畝鍗曟潵璇達紝灝辨槸杞彂涓�涓嬪弬鏁癮rg緇橳YPE鐨剅eset()鍑芥暟鍜屾瀯閫犲嚱鏁幫紝闄ゆ瀹冨氨娌℃湁鍐嶅共鍒殑浜嬫儏錛屽湪榪欎釜鍑芥暟褰撲腑錛屾垜浠敤浜嗗�間紶閫掔殑鏂瑰紡鏉ヤ紶閫掑弬鏁幫紝鏄劇劧鏄瘮杈冧綆鏁堢殑錛屽浜嗘鏃犲繀瑕佺殑鎷瘋礉銆?/p><p> </p><p>浜庢槸鎴戜滑鍑嗗鏀規垚浼犻�掑紩鐢ㄧ殑鏂瑰紡錛屽悓鏃惰�冭檻鍒拌鑳芥帴鍙梤value浣滀負鍙傛暟錛屼簬鏄敼鎴愯繖鏍鳳細</p><p> </p><p>template<class TYPE, class ARG></p><p>TYPE* acquire_obj(const ARG& arg)</p><p>{</p><p> //...</p><p>}</p><p>榪欐牱鍐欏叾瀹炲緢涓嶇伒媧伙細</p><p> </p><p>1)棣栬錛屽鏋渞eset() 鎴朤YPE鐨勬瀯閫犲嚱鏁頒笉鎺ュ彈const綾誨瀷鐨勫紩鐢紝閭ｄ笂榪扮殑鍑芥暟灝變笉鑳戒嬌鐢ㄤ簡錛屽繀欏誨彟澶栨彁渚涢潪const TYPE&鐨勭増鏈紝鍙傛暟涓�澶氱殑璇濓紝寰堥夯鐑︺�?/p><p> </p><p>2)鍏舵錛屽鏋渞eset()鎴朤YPE鐨勬瀯閫犲嚱鏁拌兘澶熸帴鍙梤value浣滀負鍙傛暟鐨勮瘽錛岃繖涓壒鎬у湪acquire_obj()閲屽ご姘歌繙涔熺敤涓嶄笂銆?/p><p> </p><p> </p><p> </p><p>鍏朵腑1)濂界悊瑙ｏ紝2)鏄粈涔堟剰鎬濓紵</p><p> </p><p>2)璇寸殑鏄繖鏍風殑闂錛屽嵆浣縏YPE瀛樺湪TYPE(TYPE&& other)榪欐牱鐨勬瀯閫犲嚱鏁幫紝瀹冨湪acquire_obj()涓篃姘歌繙涓嶄細琚皟鐢紝鍘熷洜鏄湪acquire_obj涓紝浼犻�掔粰TYPE鏋勯�犲嚱鏁扮殑錛屾案榪滄槸lvalue.</p><p> </p><p>鍝�曞闈㈣皟鐢╝cquire_obj()鏃訛紝浼犻�掔殑鏄痳value銆?/p><p> </p><p>holder get_holder();</p><p> </p><p>holder* h = acquire_obj<holder, holder>(get_holder());</p><p>铏界劧鍦ㄤ笂闈㈢殑浠ｇ爜涓紝鎴戜滑浼犻�掔粰acquire_obj鐨勬槸涓�涓猺value錛屼絾鏄湪acuire_obj鍐呴儴錛屾垜浠啀浣跨敤榪欎釜鍙傛暟鏃訛紝瀹冨嵈姘歌繙鏄痩value錛屽洜涓哄畠鏈夊悕瀛椼�?/p><p> </p><p>acquire_obj榪欎釜鍑芥暟瀹冪殑鍩烘湰鍔熻兘鍙槸浼犲彂涓�涓嬪弬鏁幫紝鐞嗘兂鐘跺喌涓嬪畠涓嶅簲璇ユ敼鍙樻垜浠紶閫掑弬鏁扮殑綾誨瀷錛氬亣濡傛垜浠紶緇欏畠lvalue,瀹冨氨搴旇浼爈value緇橳YPE錛屽亣濡傛垜浠紶rvalue緇欏畠錛屽畠灝卞簲璇ヤ紶rvalue緇橳YPE錛屼絾涓婇潰鐨勫啓娉曞嵈娌℃湁鍋氬埌榪欑偣錛岃�屽湪c++11浠ュ墠涔熸病娉曞仛鍒般�?/p><p> </p><p>forward()鍑芥暟鐨勫嚭鐜幫紝灝辨槸涓轟簡瑙ｅ喅榪欎釜闂銆?/p><p> </p><p>forward()鍑芥暟鐨勪綔鐢細瀹冩帴鍙椾竴涓弬鏁幫紝鐒跺悗榪斿洖璇ュ弬鏁版湰鏉ユ墍瀵瑰簲鐨勭被鍨嬨�?/p><p>姣斿璇村湪涓婅堪鐨勪緥瀛愪腑(鏆傛椂鐪佺暐鍙傛暟鐨勫師鍨?鍚庨潰鍐嶄粙緇?:</p><p> </p><p>澶嶅埗浠ｇ爜</p><p>holder* h = acquire_obj<holder, holder>(get_holder());</p><p>//鍋囪 acquire_obj()鎺ュ彈浜嗕竴涓猺value浣滀負鍙傛暟錛屽湪瀹冪殑鍐呴儴錛?/p><p>TYPE* acquire_obj(arg)</p><p>{</p><p> //arg鏈潵鏄痳value錛屽鏋滄垜浠洿鎺ュ紩鐢紝瀹冧細琚綋鎴恖value鏉ヤ嬌鐢ㄣ�?/p><p> //浣嗗鏋滄垜浠敤forward()澶勭悊涓�涓嬶紝鎴戜滑鍗村彲浠ュ緱鍒板畠鐨剅value鐗堟湰銆?/p><p> //姝ゅ TYPE鐨勬瀯閫犲嚱鏁版帴鍙楃殑鏄竴涓猺value銆?/p><p> TYPE* ret = new TYPE(forward(arg));</p><p>}</p><p> </p><p>//浣嗗鏋滄垜浠紶緇檃cquire_obj()鐨勬槸涓�涓猯value錛?/p><p>holder h1;</p><p>//acquire_obj鎺ュ彈浜唋value浣滀負鍙傛暟銆?/p><p>acquire_obj<holder,holder>(h1);</p><p> </p><p>TYPE* acquire_obj(arg)</p><p>{</p><p> //姝ゅ,TYPE鐨勬瀯閫犲嚱鏁版帴鍙楃殑鏄竴涓猯value銆?/p><p> TYPE* ret = new TYPE(forward(arg));</p><p>}</p><p>澶嶅埗浠ｇ爜</p><p> </p><p> </p><p>2. 浜屼釜鍘熷垯</p><p>瑕佺悊瑙orward()鏄�庝箞瀹炵幇鐨勶紝鍏堝緱璇磋c++11涓叧浜庡紩鐢ㄧ殑浜屼釜鍘熷垯銆?/p><p> </p><p>鍘熷垯(1):</p><p> </p><p>寮曠敤鎶樺彔鍘熷垯(reference collapsing rule)</p><p> </p><p>1) T& &(寮曠敤鐨勫紩鐢? 琚漿鍖栨垚 T&.</p><p> </p><p>2錛塗&& &(rvalue鐨勫紩鐢級琚紶鍖栨垚 T&.</p><p> </p><p>3) T& &&(寮曠敤浣渞value) 琚漿鍖栨垚 T&.</p><p> </p><p>4) T&& && 琚漿鍖栨垚 T&&.</p><p> </p><p> </p><p> </p><p>鍘熷垯(2):</p><p> </p><p>瀵逛簬浠value reference浣滀負鍙傛暟鐨勬ā鏉垮嚱鏁幫紝瀹冪殑鍙傛暟鎺ㄥ涔熸湁涓�涓壒孌婄殑鍘熷垯:</p><p> </p><p>鍋囪鍑芥暟鍘熷瀷涓猴細</p><p> </p><p>template<class TYPE, class ARG></p><p>TYPE* acquire_obj(ARG&& arg);</p><p>1)濡傛灉鎴戜滑浼犻�抣value緇檃cquire_obj(), ARG灝變細琚帹瀵間負ARG&錛屽洜姝?/p><p> </p><p>澶嶅埗浠ｇ爜</p><p>ARG arg;</p><p> </p><p>acquire_obj(arg)涓璦cquire_obj琚帹瀵間負</p><p>acquire_obj(ARG& &&)</p><p>鏍規嵁鍓嶉潰璇寸殑鎶樺彔鍘熷垯錛宎cquire_obj(ARG& &&)</p><p>鏈�鍚庡彉鎴?/p><p>acquire_obj(ARG&)</p><p>澶嶅埗浠ｇ爜</p><p>2)濡傛灉鎴戜滑浼犻�抮value緇檃cquire_obj(),ARG灝變細琚帹瀵間負ARG,鍥犳</p><p> </p><p>acquire_obj(get_arg());</p><p>鍒檃cquire_obj 琚帹瀵間負 acquire_obj(ARG&&)</p><p> </p><p> </p><p>3.緇撹</p><p>鏈変簡榪欎袱涓師鍒欙紝鐜板湪鎴戜滑鍙互緇欏嚭鏈�鍚巃cquire_obj鐨勫師鍨嬶紝浠ュ強forward()鐨勫師鍨嬨�?/p><p> </p><p>澶嶅埗浠ｇ爜</p><p>template<class TYPE></p><p>TYPE&& forward(typename remove_reference<TYPE>::type& arg)</p><p>{</p><p> return static_cast<TYPE&&>(arg);</p><p>}</p><p> </p><p>template<class TYPE, class ARG></p><p>TYPE* acquire_obj(ARG&& arg)</p><p>{</p><p> return new TYPE(forward<ARG>(arg));</p><p>}</p><p>澶嶅埗浠ｇ爜</p><p> </p><p> </p><p>涓嬮潰鎴戜滑楠岃瘉涓�涓嬶紝涓婅堪鍑芥暟鏄惁鑳芥甯稿伐浣滐紝鍋囧鎴戜滑浼犵粰acquire_obj涓�涓猯value錛屾牴鎹笂闈㈣鐨勬ā鏉挎帹瀵煎師鍒欙紝ARG浼氳鎺ㄥ涓篈RG&,鎴戜滑寰楀埌濡備笅鍑芥暟錛?/p><p> </p><p>澶嶅埗浠ｇ爜</p><p>TYPE* acquire_obj(ARG& && arg)</p><p>{</p><p> return new TYPE(forward<ARG&>(arg));</p><p>}</p><p> </p><p>浠ュ強鐩稿簲鐨刦orward()鍑芥暟銆?/p><p> </p><p>TYPE& && </p><p>forward(typename remove_reference<TYPE&>::type& arg)</p><p>{</p><p> return static_cast<TYPE& &&>(arg);</p><p>}</p><p> </p><p>鍐嶆牴鎹姌鍙犲師鍒欙紝鎴戜滑寰楀埌濡備笅鐨勫嚱鏁幫細</p><p>TYPE* acquire_obj(ARG& arg)</p><p>{</p><p> return new TYPE(forward<ARG&>(arg));</p><p>}</p><p> </p><p>浠ュ強鐩稿簲鐨刦orward()鍑芥暟銆?/p><p> </p><p>TYPE& </p><p>forward(typename remove_reference<TYPE&>::type& arg)</p><p>{</p><p> return static_cast<TYPE&>(arg);</p><p>}</p><p>澶嶅埗浠ｇ爜</p><p> </p><p> </p><p> 鎵�浠ワ紝鏈�鍚庡湪acquire_obj涓紝forward榪斿洖浜嗕竴涓猯value, TYPE鐨勬瀯閫犲嚱鏁版帴鍙椾簡涓�涓猯vaue, 榪欐鏄垜浠墍鎯寵鐨勩�?/p><p> </p><p> 鑰屽亣濡傛垜浠紶閫掔粰acquire_obj涓�涓猺value鐨勫弬鏁幫紝鏍規嵁妯℃澘鎺ㄥ鍘熷垯錛屾垜浠煡閬揂RG浼氳鎺ㄥ涓篈RG錛屼簬鏄緱鍒板涓嬪嚱鏁幫細</p><p> </p><p> </p><p> </p><p>澶嶅埗浠ｇ爜</p><p>TYPE* acquire_obj(ARG&& arg)</p><p>{</p><p> return new TYPE(forward<ARG>(arg));</p><p>}</p><p> </p><p>浠ュ強鐩稿簲鐨刦orward()鍑芥暟銆?/p><p> </p><p>TYPE&& </p><p>forward(typename remove_reference<TYPE>::type& arg)</p><p>{</p><p> return static_cast<TYPE&&>(arg);</p><p>}</p><p>澶嶅埗浠ｇ爜</p><p>鏈�鍚巃cquire_obj涓璮orward()榪斿洖浜嗕竴涓猺value錛孴YPE鐨勬瀯閫犲嚱鏁版帴鍙椾簡涓�涓猺value錛屼篃鏄垜浠墍鎯寵鐨勩�?/p><p> </p><p>鍙錛屼笂闈㈢殑璁捐瀹屾垚浜嗘垜浠墍鎯寵鐨勫姛鑳斤紝榪欐椂鐨刟cquire_obj鍑芥暟鎵嶆槸瀹岀編鐨勮漿鍙戝嚱鏁般�?/p><p> </p><p> </p><p> </p><p><strong style="margin: 0px; padding: 0px;">涓?move鐨勫師鍨?/strong></p><p> </p><p> </p><p>澶嶅埗浠ｇ爜</p><p>template<class T> </p><p>typename remove_reference<T>::type&&</p><p>std::move(T&& a)</p><p>{</p><p> typedef typename remove_reference<T>::type&& RvalRef;</p><p> return static_cast<RvalRef>(a);</p><p>} </p><p>澶嶅埗浠ｇ爜</p><p>鏍規嵁rvalue寮曠敤鐨勬ā鏉挎帹瀵煎師鍒欏拰鎶樺彔鍘熷垯錛屾垜浠緢瀹規槗楠岃瘉錛屾棤璁烘槸緇檓ove浼犻�掍簡涓�涓猯value榪樻槸rvalue錛屾渶緇堣繑鍥炵殑錛岄兘鏄竴涓猺value reference.</p><p> </p><p>鑰岃繖姝ｆ槸move鐨勬剰涔夛紝寰楀埌涓�涓猺value鐨勫紩鐢ㄣ�?/p><p> </p><p> </p><p> </p><p>鐪嬪埌榪欓噷鏈変漢涔熻浼氬彂鐜幫紝鍏跺疄灝辨槸涓�涓猚ast鍢涳紝紜疄鏄繖鏍鳳紝鐩存帴鐢╯tatic_cast涔熸槸鑳借揪鍒板悓鏍風殑鏁堟灉錛屽彧鏄痬ove鏇村叿璇箟緗簡銆?/p><p><br/></p></div>
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