锘??xml version="1.0" encoding="utf-8" standalone="yes"?>国产欧美日韩视频,欧美精品在线极品,亚洲精品1区2区http://m.shnenglu.com/theanswerzju/category/5865.html絀烘湁鏃犲彲濂堜綍钀藉幓鑺?鍗存棤浼兼浘鐩歌瘑褰掓潵鐕?/description>zh-cnThu, 22 May 2008 17:26:55 GMTThu, 22 May 2008 17:26:55 GMT60C++ in Details -- Item 7: 闈欐佺粦瀹氫笌鍔ㄦ佺粦瀹?/title><link>http://m.shnenglu.com/theanswerzju/archive/2008/01/12/41009.html</link><dc:creator>TheAnswer</dc:creator><author>TheAnswer</author><pubDate>Fri, 11 Jan 2008 22:53:00 GMT</pubDate><guid>http://m.shnenglu.com/theanswerzju/archive/2008/01/12/41009.html</guid><wfw:comment>http://m.shnenglu.com/theanswerzju/comments/41009.html</wfw:comment><comments>http://m.shnenglu.com/theanswerzju/archive/2008/01/12/41009.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://m.shnenglu.com/theanswerzju/comments/commentRss/41009.html</wfw:commentRss><trackback:ping>http://m.shnenglu.com/theanswerzju/services/trackbacks/41009.html</trackback:ping><description><![CDATA[<p style="FONT-SIZE: 12pt; FONT-FAMILY: courier new">   鍐欒繖涓狪tem鎸哄伓鐒剁殑錛岄沜ppblog鏃剁湅鍒拌繖綃囨枃绔?a href="http://m.shnenglu.com/sherrylso/archive/2007/11/11/36375.html">http://m.shnenglu.com/sherrylso/archive/2007/11/11/36375.html</a>錛岃瘎璁洪噷浼間箮璁ㄨ鐨勫緢嬋鐑堬紝鎰熻鎸烘湁鎰忔濈殑錛屼簬鏄氨絎旂棐錛屽啓涓嬩簡榪欑瘒闅忕瑪銆?/p> <p style="FONT-SIZE: 12pt; FONT-FAMILY: courier new">   鍦ㄨ璁洪潤鎬佺粦瀹氫笌鍔ㄦ佺粦瀹氬墠錛岄渶瑕佸厛闃愭槑涓や釜姒傚康錛氶潤鎬佺被鍨嬩笌鍔ㄦ佺被鍨嬨?/p> <p style="FONT-SIZE: 12pt; FONT-FAMILY: courier new">   榪欎袱涓蹇靛彧鍦ㄥ彉閲忔槸瀛樺湪緇ф壙鍏崇郴鐨勭被鐨勫璞$殑鎸囬拡鎴栬呭紩鐢ㄦ椂鎵嶆湁鎰忎箟錛岄潤鎬佺被鍨嬫槸浣犲0鏄庣殑綾誨瀷錛岀紪璇戞椂鍗沖彲鐭ワ紱鑰屽姩鎬佺被鍨嬫槸鎸囪繖涓寚閽堟垨鑰呭紩鐢ㄥ疄闄呮寚鍚戠殑瀵硅薄鐨勭被鍨嬶紝榪愯鏃舵墠鍙煡銆備婦鍑犱釜渚嬪瓙錛?br>鍋囪D鏄粠B鍏湁緇ф壙鐨?br>   B *bp1; // 闈欐佺被鍨?B* 鍔ㄦ佺被鍨嬫棤<br>   B *bp2 = new B; // 闈欐佺被鍨?B* 鍔ㄦ佺被鍨?B*<br>   B *bp3 = new D; // 闈欐佺被鍨?B* 鍔ㄦ佺被鍨?D*</p> <p style="FONT-SIZE: 12pt; FONT-FAMILY: courier new">   闈欐佺粦瀹氱殑鍚箟涓哄嚱鏁扮殑琛屼負(fù)鍙栧喅浜庡璞$殑闈欐佺被鍨嬶紝鑰屽姩鎬佺粦瀹氱殑鍚箟涓哄嚱鏁扮殑琛屼負(fù)鍙栧喅浜庡璞$殑鍔ㄦ佺被鍨嬶紝鏈変互涓嬪師鍒欙細(xì)<br>   1. 闈炶櫄鍑芥暟闈欐佺粦瀹氥?br>   2. 铏氬嚱鏁板姩鎬佺粦瀹氥?br>   3. 鍑芥暟鐨勭己鐪佸弬鏁伴潤鎬佺粦瀹氥?br>   4. 瀛愮被涓粎闇鍑芥暟鍚嶅嵆鍙鐩栫埗綾葷殑澶氫釜閲嶈澆鍑芥暟銆?/p> <p style="FONT-SIZE: 12pt; FONT-FAMILY: courier new">   Scott Meyers鍦ㄣ奅ffctive C++銆?nd Edition涓璉tem 37~38鍗蟲槸闃愯堪榪欎釜闂鐨勶紝澶у鍙互鍙傝冧竴涓嬶紝涓嬮潰閫氳繃涓孌靛皬紼嬪簭鍋氫釜璇存槑銆?br><br></p> <div style="FONT-SIZE: 12pt; FONT-FAMILY: courier new">#include <iostream><br><br>using namespace std;<br><br>class B<br>{<br>public:<br>    virtual void func()<br>    {<br>        cout << "B::func()\n";<br>    }<br><br>    void func(double d)<br>    {<br>        cout << "B::func(" << d << ")\n";<br>    }<br>};<br><br>class D : public B<br>{<br>public:<br>    void func()<br>    {<br>        cout << "D::func()\n";<br>    }<br><br>};<br><br>int main()<br>{<br>    B b;<br>    D d;<br>    B& rb = d;<br><br>    d.func();<br>    //d.func(2.3);<br><br>    rb.func();<br>    rb.func(2.3);<br><br>    return 0;<br>}<br></div> <p style="FONT-SIZE: 12pt; FONT-FAMILY: courier new"><br>   鍦╒C9涓嬬殑榪愯緇撴灉涓?br>   D::func()<br>   D::func()<br>   B::func(2.3)<br>   濡傛灉鍘繪帀d.func(2.3);鐨勬敞閲婏紝鍒欑紪璇戝嵆鍑洪敊銆?/p> <p style="FONT-SIZE: 12pt; FONT-FAMILY: courier new">   涓轟粈涔堜細(xì)鏈夎繖鏍風(fēng)殑緇撴灉鍛紵緇撳悎涓婇潰鐨?鏉″師鍒欐潵鐪嬶紝B涓湁涓や釜鐗堟湰鐨勯噸杞絝unc鍑芥暟錛屼竴涓負(fù)铏氬嚱鏁幫紝涓涓負(fù)闈炶櫄鍑芥暟錛孌涓噸瀹氫箟浜嗙戶鎵胯屾潵鐨刦unc()錛屼絾鏄牴鎹師鍒?錛屽師鏈篃鍙互緇ф壙鑰屾潵鐨刦unc(double)涔熻D鑷繁瀹氫箟鐨刦unc()緇欒鐩栦簡錛屾崲璦涔嬶紝鐜板湪D涓彧鏈変竴涓猣unc()鍑芥暟銆傜敱浜巇鐨勯潤鎬佸拰鍔ㄦ佺被鍨嬪潎涓篋錛岃繍琛宒.func(2.3)鐨勬椂鍊欏彂鐜版牴鏈壘涓嶅埌瀹氫箟錛屽彧鑳界紪璇戞姤閿欍傜幇鍦ㄦ潵鐪媟b錛岀敱鍓嶆墍榪幫紝rb鐨勯潤鎬佺被鍨嬩負(fù)B錛屽姩鎬佺被鍨嬩負(fù)D錛屼簬鏄痳b.func()鏍規(guī)嵁鍔ㄦ佺粦瀹氳〃鐜頒負(fù)D::func()鐨勮涓猴紝rb.func(2.3)鏍規(guī)嵁闈欐佺粦瀹氳〃鐜頒負(fù)B::func(double)鐨勮涓恒?/p> <p style="FONT-SIZE: 12pt; FONT-FAMILY: courier new">   鎴戜滑鍙互鏉ョ寽鎯充互涓嬩負(fù)浠涔堜細(xì)鏈夎繖鏍風(fēng)殑浠g爜錛岃璁¤呭師鎰忓彲鑳芥槸鎯充粎閲嶅畾涔塮unc()鑰岀戶鎵縡unc(double)鐨勯粯璁よ涓猴紝鍙儨鐢變簬C++涓鐩栬鍒欙紝浜嬩笌鎰胯繚銆傛墍浠ュ綋娣風(fēng)敤铏氬嚱鏁頒笌閲嶈澆榪欎袱縐嶄笉鍚屾椂鏈熷喅瀹氱殑澶氭佹椂錛屼竴瀹氳灝忓績銆備粠OO璁捐鐨勮搴︽潵璇達(dá)紝铏氬嚱鏁板嚑涔庤偗瀹氭槸瑕佽緇ф壙綾婚噸鍐欑殑錛岃岄潪铏氬嚱鏁版槸緇濅笉搴旇琚噸瀹氫箟鐨勶紝鎵浠ュ綋浣犵殑璁捐涓嚭鐜伴噸杞藉嚱鏁頒笉鏄悓涓鴻櫄鍑芥暟鎴栬呴潪铏氬嚱鏁版椂錛屽氨瑕佸皬蹇冭鐩栭棶棰樹簡銆?/p> <p style="FONT-SIZE: 12pt; FONT-FAMILY: courier new">   鍏充簬鍑芥暟緙虹渷鍙傛暟闂錛屻奅ffective C++銆?nd Editon Item 38璁插緱寰堟竻妤氾紝榪欓噷灝變笉璧樿堪浜嗐?img src="http://m.shnenglu.com/CuteSoft_Client/CuteEditor/images/emsmile.gif" align=absMiddle border=0><br></p> <p style="FONT-SIZE: 12pt; FONT-FAMILY: courier new"> </p> <img src ="http://m.shnenglu.com/theanswerzju/aggbug/41009.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://m.shnenglu.com/theanswerzju/" target="_blank">TheAnswer</a> 2008-01-12 06:53 <a href="http://m.shnenglu.com/theanswerzju/archive/2008/01/12/41009.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>C++ in Details -- Item 3 : 寮曠敤涓庡嚱鏁?/title><link>http://m.shnenglu.com/theanswerzju/archive/2007/12/24/39509.html</link><dc:creator>TheAnswer</dc:creator><author>TheAnswer</author><pubDate>Mon, 24 Dec 2007 07:34:00 GMT</pubDate><guid>http://m.shnenglu.com/theanswerzju/archive/2007/12/24/39509.html</guid><wfw:comment>http://m.shnenglu.com/theanswerzju/comments/39509.html</wfw:comment><comments>http://m.shnenglu.com/theanswerzju/archive/2007/12/24/39509.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://m.shnenglu.com/theanswerzju/comments/commentRss/39509.html</wfw:commentRss><trackback:ping>http://m.shnenglu.com/theanswerzju/services/trackbacks/39509.html</trackback:ping><description><![CDATA[<p style="FONT-SIZE: 12pt; FONT-FAMILY: courier new">    鍗充嬌浠呬粎鎶奀++鐪嬩綔"A Better C"錛屽紩鐢ㄤ篃鏄竴涓瀬鍏舵湁浠峰肩殑鐗規(guī)э紝鍦ㄥ嚱鏁扮殑鍙傛暟琛ㄥ拰榪斿洖鍊艱繖涓や釜棰嗗煙錛屽紩鐢ㄧ粰浜嗘垜浠竴涓瘮浼犲兼洿楂樻晥錛屾瘮浼犳寚閽堟洿鐩磋鐨勬柊鐨勯夋嫨銆?/p> <p style="FONT-SIZE: 12pt; FONT-FAMILY: courier new">    寮曠敤鏄粈涔堬紵榪欎釜闂鍏跺疄騫朵笉瀹規(guī)槗鍥炵瓟錛屽緢澶氫漢浼?xì)璇村紩鐢ㄦ槸涓涓埆鍚嶏紝榪欎釜鐞嗚В浼間箮澶繃妯$硦銆傜敤Eckel鐨勮娉曪紝寮曠敤灝卞儚鏄兘鑷姩琚紪璇戝櫒闂存帴寮曠敤鐨勫父閲忓瀷鐨勬寚閽堛備綘鏃犻渶鑰冭檻瀹冩槸鍚﹁鍒濆鍖栵紝涔熶笉鐢ㄨ冭檻鎬庢牱瀵瑰叾瑙e紩鐢紝鍥犱負(fù)緙栬瘧鍣ㄤ細(xì)鐩戠潱浣犲仛濂藉墠鑰咃紝鍙堜細(xì)鑷姩鐨勫府浣犲畬鎴愬悗鑰呫備竴涓紩鐢ㄦ繪槸鍜屼竴鍧楀悎娉曠殑瀛樺偍鍗曞厓鐩歌仈緋伙紝榪欏氨鏄綘鍞竴闇瑕佹椂鍒葷墷璁扮殑銆?/p> <p style="FONT-SIZE: 12pt; FONT-FAMILY: courier new">    鍏堣鍑芥暟鍙傛暟鍚с傚綋浣犱粎浠呴渶瑕佸弬鏁扮殑鍊兼潵鍋氬嚱鏁頒腑鐨勮繍綆楁椂錛屼紶閫掍竴涓父閲忓紩鐢ㄤ竴鑸潵璇翠細(xì)濂戒簬鍊間紶閫掋傞鍏堟槸鏁堢巼錛屽間紶閫掑氨鎰忓懗鐫鎷瘋礉鏋勯犲嚱鏁扮殑璋冪敤錛岃嚜鐒朵篃鏈夋瀽鏋勫嚱鏁扮殑寮閿錛岃岃繖浜涢兘鍙互鍦ㄤ紶閫掑紩鐢ㄧ殑鏃跺欏緱浠ラ伩鍏嶇殑錛涗粠鍑芥暟璋冪敤鑰呮潵鐪嬶紝浣跨敤浼犻掑紩鐢ㄧ殑鍑芥暟鍜屼紶鍊間紶閫掔殑鍑芥暟鐨勮皟鐢ㄥ艦寮忓茍娌℃湁鍖哄埆錛涘浜庣戶鎵夸綋緋昏岃█錛屼嬌鐢ㄥ紩鐢ㄤ紶閫掕繕鍙互閬垮厤鍒囧壊鎴栬呭垎鐗囬棶棰橈紝鍥犱負(fù)寮曠敤鍙互寰堝ソ鐨勫疄鐜板悜涓婄被鍨嬭漿鎹€傚綋鐒訛紝濡傛灉鍙槸闇瑕佷嬌鐢ㄥ鹼紝浣犲簲璇ュ皢寮曠敤澹版槑涓篶onst銆傚綋闇瑕佹敼鍙樺閮ㄥ璞$殑鏃跺欙紝寮曠敤鐨勫鎵嬪氨鍙樻垚浜嗘寚閽堬紝涓よ呭湪鏁堢巼涓婂彲浠ヨ涓哄悓絳夛紝寮曠敤鍦ㄥ嚱鏁扮殑緙栧啓鑰呯殑瑙掑害鏉ョ湅鏇磋嚜鐒訛紝鍗村鏄撹鍑芥暟鐨勮皟鐢ㄨ呬駭鐢熸販娣嗭紝鍥犱負(fù)榪欑鍙樻崲鎬ц闅愯棌浜嗐傚緢闅捐璋佸ソ璋佸潖錛屽氨鐪嬪叿浣撴儏鍐電殑鏉冭 鍚с?/p> <p style="FONT-SIZE: 12pt; FONT-FAMILY: courier new">    浠庢晥鐜囩殑瑙掑害鏉ヨ錛岃繑鍥炲煎綋鐒朵篃搴旇閫夋嫨寮曠敤錛屼笉榪囧綋浣犺繑鍥炲眬閮ㄥ璞$殑寮曠敤錛屾垨鑰呭嚱鏁板唴閮ㄧ敤new鍒濆鍖栫殑鎸囬拡鐨勫紩鐢ㄦ椂錛屾儏鍐靛氨鍙樺緱寰堢碂緋曚簡銆傚墠鑰呭湪鍑芥暟璋冪敤鑰呬嬌鐢ㄥ畠鐨勬椂鍊欏凡緇忚閿姣佷簡錛屼篃灝辨槸浣犺繚鑳屼簡寮曠敤鎬繪槸鍜屼竴鍧楀悎娉曠殑瀛樺偍鍗曞厓鐩歌仈緋葷殑鍑嗗垯錛屽悗鑰呬技涔庤В鍐充簡榪欎釜寮曠敤鏈夋晥鎬х殑闂錛屼笉榪囧緢閬楁喚錛屽紩鍙戜簡涓涓洿澶х殑闂錛氬唴瀛樻硠闇詫紝鍥犱負(fù)娌℃湁涓涓悎閫傜殑鏈哄埗鍘諱繚璇佸湪姝g‘鐨勬椂闂磀elete榪欎釜鎸囬拡錛屾瘡涓嬈$殑鍑芥暟璋冪敤閮藉鑷翠竴鐐瑰唴瀛樻硠闇詫紝榪欐槸闈炲父鍙曠殑銆傚叾瀹炲師鍒欎篃寰堢畝鍗曪紝褰撲綘紜疄闇瑕佷竴涓柊鐨勫璞$殑鏃跺欙紝浣犲氨搴旇涓哄叾浠樺嚭鏋勯犲拰鏋愭瀯鐨勫紑閿錛屾渶鍏稿瀷灝辨槸operator +, -, *, /鍑芥暟銆傚綋鐒跺ソ蹇冪殑緙栬瘧鍣ㄨ繕鏄湁鍙兘甯綘鍋氳繑鍥炲間紭鍖栫殑錛屾妸鍑芥暟榪斿洖鐨勫璞$洿鎺ユ瀯閫犲湪浣犺祴鍊肩殑瀵硅薄鐨勫唴瀛樹笂錛屼竴鍒囧張鍙樺緱緹庡ソ浜嗐?img src="http://m.shnenglu.com/CuteSoft_Client/CuteEditor/images/emsmile.gif" align=absMiddle border=0></p> <br> <img src ="http://m.shnenglu.com/theanswerzju/aggbug/39509.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://m.shnenglu.com/theanswerzju/" target="_blank">TheAnswer</a> 2007-12-24 15:34 <a href="http://m.shnenglu.com/theanswerzju/archive/2007/12/24/39509.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>C++ in Details -- Item 6 : 綾昏璁¤呯殑鏍告煡琛?/title><link>http://m.shnenglu.com/theanswerzju/archive/2007/12/24/39462.html</link><dc:creator>TheAnswer</dc:creator><author>TheAnswer</author><pubDate>Sun, 23 Dec 2007 18:54:00 GMT</pubDate><guid>http://m.shnenglu.com/theanswerzju/archive/2007/12/24/39462.html</guid><wfw:comment>http://m.shnenglu.com/theanswerzju/comments/39462.html</wfw:comment><comments>http://m.shnenglu.com/theanswerzju/archive/2007/12/24/39462.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://m.shnenglu.com/theanswerzju/comments/commentRss/39462.html</wfw:commentRss><trackback:ping>http://m.shnenglu.com/theanswerzju/services/trackbacks/39462.html</trackback:ping><description><![CDATA[<span style="FONT-SIZE: 12pt; FONT-FAMILY: courier new">    ym涓鎶夾drew Koenig錛屻奀++娌夋濆綍銆嬬粷瀵瑰彲浠ョ畻C++棰嗗煙緇忓吀钁椾綔銆備互涓嬫潯嬈炬憳鑷叾涓4绔狅紝涓嬮潰瀵筂eyers鐨勫紩鐢ㄦ槸鎴戣嚜宸卞姞涓婄殑錛岄偅杈硅寰楁洿涓鴻緇嗭紝Meyers鎬繪槸浼?xì)涓嶅帉鍏剁儲鐨勮В閲婁粬鐨勬瘡涓涓潯嬈俱?br> <br>    浠ヤ笅闂閮芥病鏈夌‘鍒囩殑絳旀錛屽叧閿槸瑕佹彁閱掍綘鎬濊冪墵浠紝騫剁‘璁ゆ墍鍋氱殑浜嬫儏鏄嚭浜庢湁鎰忚瘑鐨勫喅瀹氾紝鑰屼笉鏄伓鐒朵簨浠躲?br> <br>    1.浣犵殑綾婚渶瑕佷竴涓瀯閫犲嚱鏁板悧錛?br>        澶嶆潅鐨勭被闇瑕佹瀯閫犲嚱鏁版潵闅愯棌鐗犱滑鍐呴儴鐨勫伐浣滄柟寮忋?br> <br>    2.浣犵殑鏁版嵁鎴愬憳鏄鏈夌殑鍚楋紵<br>        Meyers98 Item20<br> <br>    3.浣犵殑綾婚渶瑕佷竴涓棤鍙傜殑鏋勯犲嚱鏁板悧錛?br>        Meyers96 Item4<br> <br>    4.鏄笉鏄瘡涓瀯閫犲嚱鏁板垵濮嬪寲鎵鏈夌殑鏁版嵁鎴愬憳銆?br>        Meyers98 Item12<br> <br>    5.綾婚渶瑕佹瀽鏋勫嚱鏁板悧錛?br>        璇ョ被鏄惁鍒嗛厤浜嗚祫婧愶紝鑰岃繖浜涜祫婧愬張涓嶄細(xì)鐢辨垚鍛樺嚱鏁拌嚜鍔ㄩ噴鏀俱?br> <br>    6.綾婚渶瑕佷竴涓櫄鏋愭瀯鍑芥暟鍚楋紵<br>        鏄惁浼?xì)閫氳繃鍩虹被鎸囬拡鍘誨垹闄ゆ淳鐢熺被瀵硅薄銆?br>        Meyers98 Item14<br> <br>    7.浣犵殑綾婚渶瑕佸鍒舵瀯閫犲嚱鏁板悧錛?br>        澶嶅埗璇ョ被鐨勫璞℃槸鍚﹀氨鐩稿綋浜庡鍒跺叾鏁版嵁鎴愬憳鍜屽熀綾誨璞°?br>        Meyers98 Item11<br> <br>    8.浣犵殑綾婚渶瑕佷竴涓祴鍊兼搷浣滅鍚楋紵<br>        濡傛灉闇瑕佸鍒舵瀯閫犲嚱鏁幫紝澶氬崐涔熶細(xì)闇瑕佷竴涓祴鍊兼搷浣滅銆?br> <br>    9.浣犵殑璧嬪兼搷浣滅鑳芥紜殑灝嗗璞¤祴緇欏璞℃湰韜悧錛?br>        Meyers98 Item17<br> <br>    10.浣犵殑綾婚渶瑕佸畾涔夊叧緋繪搷浣滅鍚楋紵<br>        閫昏緫涓婃槸鍚︽敮鎸佺浉絳夋搷浣滐紝綾葷殑鍊兼槸鍚﹀瓨鍦ㄦ煇縐嶆帓搴忓叧緋匯?br> <br>    11.鍒犻櫎鏁扮粍鏃朵綘璁頒綇浜嗙敤delete[]浜嗗悧錛?br> <br>    12.璁板緱鍦ㄥ鍒舵瀯閫犲嚱鏁板拰璧嬪兼搷浣滅鐨勫弬鏁扮被鍨嬩腑鍔犱笂const浜嗗悧錛?br>        澶嶅埗瀵硅薄涓嶄細(xì)鏀瑰彉鍘熷璞°?br> <br>    13.濡傛灉鍑芥暟鏈夊紩鐢ㄥ弬鏁幫紝鐗犱滑搴旇鏄痗onst寮曠敤鍚楋紵<br>        鍙湁褰撳嚱鏁版兂鏀瑰彉鍙傛暟鏃訛紝鎵嶅簲璇ユ湁涓嶇敤const澹版槑鐨勫紩鐢ㄥ弬鏁般?br> <br>    14.璁板緱閫傚綋鍦板0鏄庢垚鍛樺嚱鏁頒負(fù)const鐨勪簡鍚楋紵<br>        濡傛灉紜俊涓涓垚鍛樺嚱鏁頒笉鐢ㄤ慨鏀圭墵鐨勫璞★紝灝卞彲浠ュ0鏄庣墵涓篶onst錛岃繖鏍峰氨鍙互鎶婄墵鐢ㄤ簬const瀵硅薄浜嗐?br> <br>    娉? Meyers96: Scott Meyers More Effective C++.               <br>    娉? Meyers98: Scott Meyers Effective C++ 2nd edition.<img src="http://m.shnenglu.com/CuteSoft_Client/CuteEditor/images/emsmile.gif" align=absMiddle border=0><br><br></span> <img src ="http://m.shnenglu.com/theanswerzju/aggbug/39462.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://m.shnenglu.com/theanswerzju/" target="_blank">TheAnswer</a> 2007-12-24 02:54 <a href="http://m.shnenglu.com/theanswerzju/archive/2007/12/24/39462.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>C++ in Details -- Item 5 : 鍐呰仈鐪熺殑閭d箞緹庡ソ鍚?/title><link>http://m.shnenglu.com/theanswerzju/archive/2007/12/24/39461.html</link><dc:creator>TheAnswer</dc:creator><author>TheAnswer</author><pubDate>Sun, 23 Dec 2007 18:52:00 GMT</pubDate><guid>http://m.shnenglu.com/theanswerzju/archive/2007/12/24/39461.html</guid><wfw:comment>http://m.shnenglu.com/theanswerzju/comments/39461.html</wfw:comment><comments>http://m.shnenglu.com/theanswerzju/archive/2007/12/24/39461.html#Feedback</comments><slash:comments>1</slash:comments><wfw:commentRss>http://m.shnenglu.com/theanswerzju/comments/commentRss/39461.html</wfw:commentRss><trackback:ping>http://m.shnenglu.com/theanswerzju/services/trackbacks/39461.html</trackback:ping><description><![CDATA[<span style="FONT-SIZE: 12pt; FONT-FAMILY: courier new">    鍑犱箮姣忎釜C/C++紼嬪簭鍛橈紝閮戒細(xì)鎶婃晥鐜囪涓虹▼搴忕殑鐢熷懡綰匡紝浠ヨ嚦浜庢湁鏃剁敋鑷充笉鎰挎剰鎵挎媴鍑芥暟璋冪敤鐨勫紑閿銆傛槸鐨勶紝綆鍗曠殑涓鍙ュ嚱鏁拌皟鐢紝鍗存剰鍛崇潃鍙傛暟鍘嬫爤錛岀敓鎴愭眹緙栬璦鐨凜ALL錛岃繑鍥炲弬鏁幫紝鎵ц姹囩紪璇█鐨凴ETURN榪欎箞澶氱殑棰濆寮閿錛岃繖涓鍒囧彲鑳芥槸浠呬粎涓轟簡浣跨敤鏌愪釜鍙湁涓琛屼唬鐮佺殑鍑芥暟浣擄紝鏇翠綍鍐礳all鎸囦護(hù)甯稿父浼?xì)瀵艰嚧鎸囦护缂撳啿鍖鸿娓吔I猴紝寮曡搗灞閮ㄦх殑涓уけ銆傝繖瀵硅鏁堢巼涓虹敓鍛界殑紼嬪簭鍛樻潵璇達(dá)紝璇ユ槸澶氫箞鍙曠殑浜嬫儏鍟娿?br> <br>    浜庢槸涓浜汣/C++紼嬪簭鍛樺彂鐜頒簡棰勫鐞嗗櫒榪欎釜濂戒笢瑗匡紝鐢ㄥ畯鏉ユā鎷熶竴涓嚱鏁拌皟鐢紝娑堥櫎浜嗘墍鏈夊紑閿錛屽張浼間箮寰楀埌浜嗗拰鍑芥暟璋冪敤鍚屾牱鐨勬晥鏋溿傚彲鎯滃ソ鏅笉闀匡紝鐢變簬浠呬粎鏄畝鍗曠殑鏂囨湰鏇挎崲錛屼細(xì)鍑虹幇琛ㄨ揪寮忓湪瀹忓唴灞曞紑鏃朵紭鍏堢駭鑳岀鏈熸湜錛屼簬鏄皚鎱庣殑紼嬪簭鍛樹滑鍙兘鎶婂弬鏁伴兘鐢ㄦ嫭鍙鋒嫭璧鋒潵錛屽彲鏄嵆浣挎槸榪欐牱錛屽綋闈㈠鍙傛暟姹傚肩殑鍓綔鐢ㄦ椂錛岃繕鏄樉鐨勬棤鑳戒負(fù)鍔涖傚浜庨挓鎯呬簬OO鐨凜++紼嬪簭鍛橈紝浠栦滑鍙戠幇浜嗕竴涓洿緋熺硶鐨勯棶棰橈細(xì)鐢ㄥ畯妯℃嫙鐨勫嚱鏁版棤娉曡闂被鐨勭鏈夋垚鍛橈紝浠ヨ嚧浜庢棤娉曚嬌鍏舵垚涓烘垚鍛樺嚱鏁般?br> <br>    榪樺ソC++榪樻彁渚涗簡鍙︿竴涓埄鍣細(xì)鍐呰仈銆傚彧瑕佸湪鍑芥暟瀹氫箟鍓嶇畝鍗曠殑鍔犱笂inline鍏抽敭瀛楋紝灝卞彲浠ョ敤鏅氬嚱鏁板疄鐜板畯鐨勬晥鐜囷紝澶栧姞鍙璁$殑琛屼負(fù)鍜岀被鍨嬪畨鍏紝鑰屼笖緙栬瘧鍣ㄨ繕鍙互瀵瑰嚱鏁頒綋鎵ц鐗瑰畾鐜涓嬬殑浼樺寲銆備綘鍙互鎶婂畾涔夋斁鍦ㄥご鏂囦歡涓紝鐢ㄤ簬姣忎釜浣跨敤榪欎釜鍑芥暟鐨勬枃浠惰屼笉浼?xì)漶旂敓澶氫釜瀹氫箟鐨勯敊璇傝嚦浜庢垚鍛樺嚱鏁幫紝灝辨洿緹庡浜嗭紝鍙浣犲湪綾葷殑鍐呴儴瀹氫箟錛屽氨鑷姩鎴愪負(fù)鍐呰仈鍑芥暟錛岀敋鑷充笉闇瑕侀澶栧0鏄庯紝榪欑鐢ㄦ硶琚ぇ閲忕殑鐢ㄤ負(fù)綾繪垚鍛樼殑璁塊棶鍑芥暟銆?br> <br>    鍙槸銆傘傘備綘涔熻浼?xì)闂Q屽唴鑱旂湡鐨勯偅涔堢編濂藉悧錛熼偅涓轟粈涔圕++涓嶉粯璁ゆ墍鏈夊嚱鏁伴兘鏄唴鑱斿嚱鏁幫紝榪欐牱涓嶆槸鏇寸渷浜嬪悧錛?br> <br>    榪樻槸閭e彞鑰佽瘽錛屽ぉ涓嬫病鏈夊厤璐圭殑鍗堥錛屽湪浣犱韓鍙楀唴鑱旂粰浣犲甫鏉ョ殑濂藉鐨勫悓鏃訛紝浣犱篃鍦ㄤ負(fù)姝や粯鍑轟唬浠鳳紝鏈変簺寰堟槑鏄撅紝鏈変簺浣犲嵈鏈繀鎰忚瘑鍒般?br> <br>    鏈鏄捐屾槗瑙佺殑錛岀敱浜庣敤鍑芥暟浣撲唬鏇垮嚱鏁拌皟鐢紝鐩爣浠g爜鐨勪綋縐嚑涔庝笉鍙伩鍏嶇殑澧炲ぇ浜嗭紝榪欐剰鍛崇潃鏇村鐨勫唴瀛樺崰鐢ㄣ傝櫄鎷熷唴瀛橈紵鏄殑錛岃櫄鎷熷唴瀛樺彲浠ュ綰蟲洿澶х殑紼嬪簭錛屼絾鏄繃浜庡簽澶х殑浠g爜浣撶Н寰堟湁鍙兘瀵艱嚧棰戠箒鐨勯〉闈㈣皟搴︾敋鑷崇郴緇熼綈革紝涓涓湪I/O涓婇綣佹搷浣滅殑紼嬪簭錛屼綘鑳芥寚鏈涚墵蹇埌鍝噷鍘誨憿錛?br> <br>    鍜宻tatic鎴栬卌onst涓嶄竴鏍鳳紝inline浠呬粎鎰忓懗瀵圭紪璇戝櫒涓涓緩璁垨鑰呴個(gè)璇鳳紝渚嬪闈㈠閫掑綊鍑芥暟鐨勬椂鍊欙紝緇濆ぇ澶氭暟緙栬瘧鍣ㄤ細(xì)鏃犺浣犳剼锠㈢殑寤鴻銆傝緙栬瘧鍣ㄦ嫆緇濈殑鏃跺欙紝浼?xì)鍙戠敓浠涔堝憿錛熺幇琛孋++鏍囧噯瑙勫畾榪欎釜鎯呭喌涓嬬紪璇戝櫒灝辮鍍忓寰呴潪鍐呰仈鍑芥暟涓鏍鳳紝褰撲綘鎶婂畾涔夋斁鍦ㄥご鏂囦歡鑰岀敤浜庡閲嶇紪璇戝崟鍏冪殑鏃跺欙紝澶氬畾涔夐敊璇究鏄笉鍙伩鍏嶇殑銆傛墍浠ワ紝璇蜂笉瑕佷綆浼扮紪璇戝櫒鐨勬櫤鎱э紝鎰氳牏鐨勫唴鑱斿緩璁渶鍚庝拱鍗曠殑榪樻槸浣犺嚜宸便?br> <br>    閭g紪璇戝櫒鍒板簳鐢ㄤ粈涔堝噯鍒欐潵鍐沖畾鏄惁鎼悊浣犵殑inline寤鴻鍛紵鏍囧噯鐨勭瓟妗堟槸娌℃湁絳旀錛屼絾鏄湁涓浜涘熀鏈殑鍘熷垯鍙互浣滀負(fù)鍙傝冦傞鍏堬紝鍑芥暟澶鏉傜殑鏃跺欙紝緙栬瘧鍣ㄤ竴鑸細(xì)鏀懼純鍐呰仈錛屼緥濡備笂闈㈡彁鍒扮殑閫掑綊璋冪敤錛屽嚱鏁板唴鏈夊驚鐜紝鍐嶆垨鑰呭嚱鏁頒綋鐢辮澶氳鍙ョ粍鎴愶紝鎬諱箣涓鏃︾紪璇戝櫒瑙夊緱涓嶅垝綆楃殑鏃跺欑墵灝卞緢鐞嗘櫤鐨勯夋嫨鏀懼純錛涘綋鏄懼紡鎴栬呴殣寮忓湴鍙栧嚱鏁板湴鍧騫朵笖浣跨敤鍦板潃鐨勶紝蹇呯劧涓嶄細(xì)鍙戠敓鍐呰仈錛屼綘鎬諱笉鑳芥寚鏈涚紪璇戝櫒涓轟綘鐢熸垚涓涓茍涓嶅瓨鍦ㄧ殑鍑芥暟鐨勫湴鍧鍚э紱鏋勯犲嚱鏁板拰鏋愭瀯鍑芥暟涓鑸篃涓嶉傚悎鍐呰仈錛屽洜涓鴻繖涓や釜瀹朵紮緇忓父浼?xì)姣斾綘鐪嬪埌鐨勫嚱鏁颁綋鏇翠负澶嶆潅锛尀鍏舵槸娑夊強(qiáng)鐟翩壙鏃剁殑灞倠啤寰忕珛涓庨攢姣佺殑鏃跺欍傝繕鏈変竴鐐逛篃璁稿嚭涔庝綘鐨勬剰鏂欙紝鍐呰仈鏄拰鍑芥暟璋冪敤鑰岄潪鍑芥暟鏈韓鑱旂郴鍦ㄤ竴璧風(fēng)殑錛屼篃灝辨槸璇寸紪璇戝櫒瀹屽叏鍙兘鍦ㄦ煇浜涜皟鐢ㄧ偣浣跨敤鍐呰仈鑰屽湪鍏朵粬璋冪敤鐐逛笉浜堝唴鑱旓紝榪欏畬鍏ㄦ牴鎹紪璇戝櫒瀵逛笂涓嬫枃鐨勫垽鏂屽畾銆?br> <br>    娌℃湁浜鴻兘淇濊瘉紼嬪簭娌℃湁bug錛屾墍浠ユ墠闇瑕佽皟璇曘傚彲鏄紝褰撹皟璇曞櫒閬囧埌鍐呰仈鍑芥暟鐨勬椂鍊欙紝浣犺兘鎯沖埌涓涓ソ鍔炴硶璁╁叾涓嶆檿鑿滃悧錛熸庝箞鍦ㄤ竴涓笉瀛樺湪鐨勫嚱鏁伴噷璁劇疆鏂偣鍛紵鎬庝箞鍗曟鎵ц鍒拌繖鏍蜂竴涓嚱鏁板憿錛熸庝箞淇樿幏瀵瑰畠鐨勮皟鐢ㄥ憿錛熸眰姹備綘浜嗭紝鍚屾儏涓涓嬪彲鎬滅殑璋冭瘯鍣ㄥ惂銆?br> <br>    鍏跺疄鍙璁よ瘑鍒頒竴鐐癸紝鍐呰仈鐨勬湰璐ㄦ槸涓縐嶄紭鍖栵紝浜嬫儏灝卞彉寰楃畝鍗曚簡銆備紭鍖栨槸寤虹珛鍦ㄧ▼搴忔湰韜殑姝g‘鎬х殑鍩虹涓婄殑錛岃屼笖涓鑸岃█錛屾湁閭d簺閫氭檽鐢熸垚浠g爜鍜屾墽琛岀幆澧冪殑宸ュ叿鏉ユ墽琛屽線寰姣旂▼搴忓憳鏁堟灉鏇村ソ銆?img src="http://m.shnenglu.com/CuteSoft_Client/CuteEditor/images/emsmile.gif" align=absMiddle border=0><br><br></span> <img src ="http://m.shnenglu.com/theanswerzju/aggbug/39461.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://m.shnenglu.com/theanswerzju/" target="_blank">TheAnswer</a> 2007-12-24 02:52 <a href="http://m.shnenglu.com/theanswerzju/archive/2007/12/24/39461.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>C++ in Details -- Item 4 : 緙栬瘧鍣ㄧ殑騫曞悗琛屼負(fù)http://m.shnenglu.com/theanswerzju/archive/2007/12/24/39460.htmlTheAnswerTheAnswerSun, 23 Dec 2007 18:51:00 GMThttp://m.shnenglu.com/theanswerzju/archive/2007/12/24/39460.htmlhttp://m.shnenglu.com/theanswerzju/comments/39460.htmlhttp://m.shnenglu.com/theanswerzju/archive/2007/12/24/39460.html#Feedback0http://m.shnenglu.com/theanswerzju/comments/commentRss/39460.htmlhttp://m.shnenglu.com/theanswerzju/services/trackbacks/39460.html    鍜孋璇█鐩告瘮錛孋++鐨勭紪璇戝櫒闄や簡鍋氭洿涓ユ牸鐨勭被鍨嬫鏌ョ殑宸ヤ綔澶栵紝浼間箮涔熷彉寰楁洿涓哄嫟蹇簡錛屼細(xì)鍦ㄥ箷鍚庨粯榛樺府浣犺ˉ鍏ㄤ綘鐪嬭搗鏉ユ紡鎺夌殑鍑芥暟銆備竴涓笉浜嗚В緙栬瘧鍣ㄥ箷鍚庤涓虹殑C++紼嬪簭鍛樼畝鐩村拰涓涓笉鐭ラ亾鑷繁姹借濺鐗規(guī)х殑鍙告満涓鏍峰彲鎬曘傛湰鏂囧氨鏄負(fù)浜嗘秷闄よ繖縐嶅彲鎬曡屽啓銆?br> 
    鍋囪浣犲畾涔変簡涓涓┖綾?br>    class A {};
    鍦–++緙栬瘧鍣ㄩ氳繃瀹冪殑鏃跺欙紝榪欎釜綆鍗曠殑絀虹被涔熷彉寰椾赴瀵屽褰╀簡錛屼簨瀹炰笂浣犲浜嗕竴涓己鐪佹瀯閫犲嚱鏁幫紝涓涓嫹璐濇瀯閫犲嚱鏁幫紝涓涓祴鍊艱繍綆楃錛屼竴涓瀽鏋勫嚱鏁頒互鍙?qiáng)涓瀵瑰彇鍦板潃榪愮畻絎︼紝鎬庝箞鏍鳳紝榛橀粯涓轟綘澹版槑浜嗚繖涔堝鍑芥暟錛孋++緙栬瘧鍣ㄥ鍕ゅ揩鐨勪簡鍚с備笉榪囧ぉ涓嬫病鏈夊厤璐圭殑鍗堥錛屼換鍔充換鎬ㄧ殑緙栬瘧鍣ㄥ彲鑳藉湪涓嶇粡鎰忛棿宸茬粡緇欎綘璁句笅浜嗛櫡榪涖?br> 
    1.緙虹渷鏋勯犲嚱鏁般傚疄闄呬笂錛屽畠浠涔堥兘涓嶅仛錛屽緢瀹夊叏錛岃屼笖褰撲綘澹版槑浜嗚嚦灝戜竴涓瀯閫犲嚱鏁扮殑鏃跺欙紝緙栬瘧鍣ㄥ氨涓嶅啀鐢熸垚緙虹渷鏋勯犲嚱鏁般?br> 
    2.鎷瘋礉鏋勯犲嚱鏁幫紙璧嬪艱繍綆楃錛夈傜己鐪佹嫹璐濇瀯閫犲嚱鏁幫紙璧嬪艱繍綆楃錛夊綾葷殑闈為潤鎬佹暟鎹垚鍛樿繘琛?"浠ユ垚鍛樹負(fù)鍗曚綅鐨? 閫愪竴鎷瘋礉鏋勯狅紙璧嬪鹼級銆備篃灝辨槸璇翠細(xì)瀵圭被涓殑闈為潤鎬佹暟鎹垚鍛樿繘琛岄掑綊鐨勬嫹璐濇瀯閫犲嚱鏁幫紙璧嬪艱繍綆楃錛夎皟鐢紝鐩村埌鎵懼埌涓涓嫹璐濇瀯閫犲嚱鏁幫紙璧嬪艱繍綆楃錛夋垨鑰呭唴緗被鍨嬩負(fù)姝€傚浜庡唴緗被鍨嬶紝鍒欎嬌鐢ㄤ粠婧愬璞″埌鐩殑瀵硅薄鐨勯愪綅鎷瘋礉銆傚彲鏄傘傘傚綋浣犵殑鏁版嵁鎴愬憳鏄寚閽堢殑鏃跺欏憿錛熺粨鏋滄槸婧愬璞″拰鐩殑瀵硅薄鐨勬寚閽堟垚鍛橀兘鎸囧悜浜嗗悓涓鐗囧唴瀛樼┖闂達(dá)紝濡傛灉鐩殑瀵硅薄鍘熸潵灝辨湁鎸囧悜鐨勫唴瀹癸紝灝變駭鐢熶簡鍐呭瓨娉勯湶錛屽嵆浣挎病鏈夛紝鍙鏈変竴涓璞″厛娑堜骸錛屽彟涓涓殑鎸囬拡灝辨?zhèn)I轟簡錛屽彧鏄涔堝彲鎬曠殑浜嬫儏鍟娿傛墍浠ワ紝褰撶被涓湁鎸囬拡鎴愬憳鐨勬椂鍊欙紝灝卞簲璇ヨ嚜宸卞畾涔夋嫹璐濇瀯閫犲嚱鏁幫紙璧嬪艱繍綆楃錛夛紝鑷充簬鏄畝鍗曟嫹璐濊繕鏄紩鐢ㄨ鏁幫紝灝卞彲浠ユ牴鎹疄闄呮儏鍐佃屽畾浜嗐?br> 
    3.鏋愭瀯鍑芥暟銆傜己鐪佹瀽鏋勫嚱鏁頒篃涓嶅仛浠涔堢壒鍒殑浜嬫儏錛屼粎浠呮槸閿姣佸璞°備笉榪囨湁鐐歸渶瑕佹敞鎰忥紝鐢熸垚鐨勬瀽鏋勫嚱鏁頒竴鑸槸闈炶櫄鎷熺殑錛岄櫎闈炴槸浠庝竴涓0鏄庝簡铏氭嫙鏋愭瀯鍑芥暟鐨勫熀綾葷戶鎵胯屾潵銆傛瀽鏋勫嚱鏁幫紝铏氭嫙鏋愭瀯鍑芥暟錛岀函铏氭瀽鏋勫嚱鏁幫紝榪欎笁鑰呮湁浠涔堝尯鍒憿錛熼鍏堬紝鏋愭瀯鍑芥暟鍜屾瀯閫犲嚱鏁頒竴鏍鳳紝鏄彲浠ユ部綾誨眰嬈¤繘琛岃皟鐢ㄧ殑錛屼篃灝辨槸璇存瀽鏋勫嚱鏁頒細(xì)浠庝綘瑕佸垹闄ょ殑綾誨紑濮嬶紝涓鐩村悜涓婂埌鍩虹被涓烘錛屼互瀹炵幇綾誨眰嬈$殑鎷嗗嵏錛涗絾鏄綋浣犲笇鏈涢氳繃鍩虹被鐨勬寚閽堝幓鍒犻櫎媧劇敓綾葷殑瀵硅薄鐨勬椂鍊欙紝濡傛灉娌℃湁铏氭嫙鏋愭瀯鍑芥暟錛岄偅涔堣涓哄氨鏄負(fù)瀹氫箟鐨勶紝鎵浠ュ綋浣犵殑綾諱腑鏈夊ぇ浜庣瓑浜庝竴涓櫄鍑芥暟鐨勬椂鍊欙紝浣犲氨搴旇绔嬪埢鎰忚瘑鍒幫紝浣犻渶瑕佷竴涓櫄鎷熸瀽鏋勫嚱鏁幫紝鎴栬呰錛屼綘搴旇淇濊瘉鍩虹被鎷ユ湁涓涓櫄鏋勯犲嚱鏁般傞偅綰櫄鏋愭瀯鍑芥暟鍙堟湁浠涔堢敤鍛紵綰櫄鍑芥暟灝嗕駭鐢熸娊璞$被銆傛湁浜涙椂鍊欙紝浣犳兂浣夸竴涓被鎴愪負(fù)鎶借薄綾伙紝浣嗗垰濂藉張娌℃湁浠諱綍綰櫄鍑芥暟銆傛庝箞鍔烇紵鍥犱負(fù)鎶借薄綾繪槸鍑嗗琚敤鍋氬熀綾葷殑錛屽熀綾誨繀欏昏鏈変竴涓櫄鏋愭瀯鍑芥暟錛岀函铏氬嚱鏁頒細(xì)浜х敓鎶借薄綾伙紝鎵浠ユ柟娉曞緢綆鍗曪細(xì)鍦ㄦ兂瑕佹垚涓烘娊璞$被鐨勭被閲屽0鏄庝竴涓函铏氭瀽鏋勫嚱鏁幫紝鏄殑錛屽氨鏄繖涔堢畝鍗曘傚綋鐒跺暒錛屼綘榪橀渶瑕佷負(fù)榪欎釜綰櫄鏋愭瀯鍑芥暟鎻愪緵涓涓畾涔夛紝鍝曚粎浠呮槸{}錛岃屽湪鍏舵淳鐢熺被涓紝緙栬瘧鍣ㄤ細(xì)鑷姩鐢熸垚涓涓瀽鏋勫嚱鏁扮殑瀹氫箟銆?br> 
    4.鍙栧湴鍧榪愮畻絎︺傝繖涓瘮杈冪畝鍗曪紝鍙槸鍗曠函鐨勮繑鍥炰簡瀵硅薄鐨勫湴鍧錛屼笉榪囨牴鎹繑鍥炲兼槸鍚︿負(fù)const榪樻槸鍑虹幇浜嗛噸杞姐?br> 
    榪欓噷榪樺簲璇ヨ冭檻涓縐嶆儏鍐碉紝鏈夋椂鍊欎綘鍙互紜畾涓嶉渶瑕佹煇浜涢殣寮忕敓鎴愮殑鍑芥暟銆備緥濡傚湪浣犵殑綾諱腑鎷瘋礉鍜岃祴鍊奸兘鏄笉鍏佽鐨勶紝榪欐椂鍊欎綘灝辮鍧氬喅鐨勭姝㈢紪璇戝櫒鐢熸垚瀹冧滑銆傛柟娉曞叾瀹炲緢綆鍗曪紝鎶婂畠浠0鏄庝負(fù)private錛屽茍涓斾笉瑕佸幓瀹氫箟銆傛槸鐨勶紝灝辮繖涔堢畝鍗曪紝浣嗕綘璇曞浘璋冪敤鐨勬椂鍊欙紝緙栬瘧鍣ㄤ細(xì)鍝囧搰澶у彨錛屼綘鍙堥伩鍏嶄簡涓嬈¢敊璇?img src="http://m.shnenglu.com/CuteSoft_Client/CuteEditor/images/emsmile.gif" align=absMiddle border=0>



TheAnswer 2007-12-24 02:51 鍙戣〃璇勮
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C++ in Details -- Item 2 : 綾誨瀷杞崲http://m.shnenglu.com/theanswerzju/archive/2007/12/24/39459.htmlTheAnswerTheAnswerSun, 23 Dec 2007 18:46:00 GMThttp://m.shnenglu.com/theanswerzju/archive/2007/12/24/39459.htmlhttp://m.shnenglu.com/theanswerzju/comments/39459.htmlhttp://m.shnenglu.com/theanswerzju/archive/2007/12/24/39459.html#Feedback0http://m.shnenglu.com/theanswerzju/comments/commentRss/39459.htmlhttp://m.shnenglu.com/theanswerzju/services/trackbacks/39459.html    鎬繪槸浼?xì)鏈変竴浜涗笢瑗匡紝鎴戜滑涓嶅枩嬈㈠嵈韜蹭笉寮錛屾瘮濡傝鑰冭瘯錛屽張姣斿璇碈++涓殑綾誨瀷杞崲銆備綔涓轟竴縐嶅己綾誨瀷鐨勭紪紼嬭璦錛岀被鍨嬭漿鎹㈠氨鍍忕幇瀹炵敓媧諱腑鍙樻崲鍥界睄涓鏍鋒亹鎬栵紝涓嶈繃涔熸病鍔炴硶錛岀▼搴忓憳瑕佹敼鍙樺彉閲忕殑灞炴э紝涓嶆槸緙栬瘧鍣ㄨ兘闃繪鐨勶紝灝卞儚寮犻搧鏋楀緪甯嗕箣嫻佹寕鐫澶栧浗綾嶇殑鍗庝漢婕斿憳錛屾垜浠櫎浜嗗湪蹇冮噷姝ц鍑犳涔嬪涔熸病鍟ュ疄璐ㄦх殑鐞嗙敱鍘昏按璐c侰++涓栫晫鍜岀幇瀹炰竴鏍鳳紝鎬繪槸鏈夊緢澶氳鎴戜滑鎰熷埌鏃犲鐨勫湴鏂廣?br> 
    綾誨瀷杞崲涓嶅涔庝袱縐嶏細(xì)鏄懼紡綾誨瀷杞崲鍜岄殣寮忕被鍨嬭漿鎹紝涓嬮潰鍒嗗埆璇存槑銆?br> 
    1.鏄懼紡綾誨瀷杞崲銆侰++寮曞叆浜嗗洓涓柊鐨勭被鍨嬭漿鎹㈢錛屽彲浠ユ浛浠椋庢牸綾誨瀷杞崲鐨勫叏閮ㄥ姛鑳斤紝騫舵彁渚涗簡鏇村己澶х殑鍔熻兘鍜屾洿濂界殑瀹夊叏鎬э紝鍏嬫湇浜咰椋庢牸鐨勭被鍨嬭漿鎹㈢洰鐨勬т笉鏄庣‘鍜岄毦浠ユ煡鎵劇殑緙洪櫡銆?br> 
    (1).static_cast錛氱敤浜庢槑紜畾涔夌殑鍙樻崲錛屽熀鏈笂鍜岄氱敤鐨凜椋庢牸綾誨瀷杞崲鏈夌潃鍚屾牱鐨勮兘鍔涳紝鍚箟浠ュ強(qiáng)鍔熻兘闄愬埗銆傚寘鎷紪璇戝櫒鍏佽鎴戜滑鎵鍋氱殑涓嶇敤寮哄埗杞崲鐨?#8220;瀹夊叏”鍙樻崲鍜屼笉澶畨鍏ㄤ絾娓呮瀹氫箟鐨勫彉鎹€?br> 
    (2).const_cast錛氱敤鏉ユ敼鍙樺璞$殑const鎴栬卾olatile灞炴э紝鑰屼笖鐢辯紪璇戝櫒寮哄埗綰︽潫璇剰鍙兘鍋氳繖涓彉鎹€傝繖涓漿鎹㈢鍏跺疄寰堥浮鑲嬶紝鍥犱負(fù)鎶婁竴涓潪甯擱噺鎸囬拡鎴栧紩鐢ㄨ祴緇欎竴涓父閲忔寚閽堟垨寮曠敤鏈韓灝辨槸鍚堟硶鐨勶紱鍙嶈繃鏉ョ殑璇濅竴鑸潵璇寸敤綾誨瀷杞崲鍘繪帀瀵硅薄鐨勫父閲忓睘鎬ч氬父鏄笉濂界殑緙栫▼椋庢牸錛屽洜涓哄畬鍏ㄦ湁鍙兘緙栬瘧鍣ㄥ凡緇忔妸璇ュ璞″瓨鍌ㄥ湪浜嗗彧璇誨唴瀛樹腑錛岃屼笖灝遍昏緫涓婃潵璇村緢闅炬壘鍒板幓闄onst灞炴х殑鍚堢悊瑙i噴錛屽鏋滃彧鏄拰綾繪垚鍛樼浉鍏崇殑錛屽垯搴旇浣跨敤mutable銆?br> 
    (3).dynamic_cast錛氱敤浠ラ拡瀵逛竴涓戶鎵夸綋緋誨仛鍚戜笅鎴栬呮í琛岀殑瀹夊叏杞崲錛屽茍涓斿彲浠ョ煡閬撹漿鎹㈡槸鍚︽垚鍔燂紝澶辮觸浼?xì)閫氳繃絀烘寚閽堟垨鑰呭紓甯革紙鍥犱負(fù)娌℃湁絀哄紩鐢級鏉ユ彁閱掔▼搴忓憳銆傚煎緱娉ㄦ剰鐨勬槸榪欎釜緇ф壙浣撶郴閲屽繀欏昏鏈夎櫄鍑芥暟錛屽洜涓篸ynamic_cast闇瑕佽鍙朧TABLE鍐呯殑淇℃伅鏉ュ仛鍒ゆ柇錛岃繖閲屼篃鍙互寮曞嚭RTTI鐨勯棶棰橈紝浠ュ悗鍐嶅啓鍚с傝繖涓漿鎹㈢鎸哄疄鐢ㄧ殑錛屼篃娌℃湁浠涔堣嚧鍛界己闄鳳紝灝辨槸闇瑕佷竴鐐歸澶栫殑寮閿鍚с?br> 
    (4).reinterpret_cast錛氶噸瑙i噴杞崲錛屾悶涓嶅お娓呮錛屾殏鏃朵篃娌℃湁鍙戠幇璁茬殑姣旇緝閫忓交鐨勮祫鏂欍傚紩鐢‥ckel鐨勮瘽“浣跨敤reinterpret_cast閫氬父鏄竴縐嶄笉鏄庢櫤錛屼笉鏂逛究鐨勭紪紼嬫柟寮?#8221;錛屼笉鐢ㄥ氨涓嶄細(xì)鍑洪敊浜嗐?br> 
    2.闅愬紡綾誨瀷杞崲銆侰++鐨勭紪璇戝櫒鍜孋鐩告瘮錛屽嫟鍔充簡澶澶錛屾繪槸鍠滄榛橀粯涓烘垜浠仛浠涔堜簨鎯咃紝澶鏃跺欒繖緇欐垜浠甫鏉ヤ簡渚垮埄錛屼絾榪囩姽涓嶅強(qiáng)錛屼換鍔充換鎬ㄧ殑緙栬瘧鍣ㄤ篃浼?xì)缁欐垜浠甫鏉ラ櫙偪涘Q屾瘮濡傝闅愬紡綾誨瀷杞崲銆?br> 
    鍦–鍜孋++涓紝濡傛灉緙栬瘧鍣ㄧ湅鍒頒竴涓〃杈懼紡鎴栬呭嚱鏁拌皟鐢ㄤ嬌鐢ㄤ簡涓涓笉鍚堥傜殑綾誨瀷錛屽畠?yōu)兗?xì)灝濊瘯鐫鎵ц涓涓嚜鍔ㄧ被鍨嬭漿鎹紝浠庣幇鍦ㄧ殑綾誨瀷杞崲鍒版墍瑕佹眰鐨勭被鍨嬨傚鏋滃彧鏄浐鏈夌被鍨嬶紝涓鍒囦技涔庡緢瀹岀編錛屽洜涓哄彲浠ユ妸涓涓猧nt鍊間紶閫佺粰瀹氫箟涓篸ouble鍙傛暟鐨勫嚱鏁幫紝涓嶈繃涓鏃︽秹鍙?qiáng)鍒颁簡鑷畾涔壘c誨瀷錛屼簨鎯呭氨鍙樼碂緋曚簡銆?br> 
    鏈変袱縐嶅嚱鏁板彲鑳戒細(xì)瀵艱嚧闅愬紡綾誨瀷杞崲錛氬崟鍙傛暟鏋勯犲嚱鏁幫紙涔熷彲浠ユ槸闄や簡絎竴涓弬鏁板叾浠栭兘鏈夐粯璁ゅ肩殑澶氬弬鏁版瀯閫犲嚱鏁幫級浠ュ強(qiáng)綾誨瀷杞崲榪愮畻絎﹂噸杞藉嚱鏁般傚墠鑰呯敱鐩殑綾繪墽琛岃漿鎹紝涔熷氨鏄鍔犱竴涓柊綾葷殑鏃跺欎負(fù)鐜版湁緋葷粺澧炲姞浜嗘柊鐨勮漿鎹㈤斿緞錛屽悗鑰呯敱婧愮被鎵ц杞崲錛屾墍浠ュ彧鏈夊悗鑰呮墠鑳藉疄鐜頒粠鑷畾涔夌被鍨嬪埌鍐呯疆綾誨瀷鐨勮漿鎹€?br> 
    浣嗘槸闅愬紡杞崲閫氬父閮芥槸涓嶅畨鍏ㄧ殑銆傜粡甯鎬細(xì)鍦ㄤ綘鏍規(guī)湰涓嶅笇鏈涜繘琛岀被鍨嬭漿鎹㈢殑鏃跺欒璋冪敤錛屼粠鑰屽彲鑳藉鑷撮敊璇殑浠g爜欏哄埄閫氳繃緙栬瘧鎴栬呯▼搴忕殑榪愯涓嶇鍚堥鏈燂紝鍙︿竴鏂歸潰錛屽彲鑳戒細(xì)鍜岄噸杞借В鏋愪駭鐢熷啿紿侊紝榪欏湪鎻愪緵浜嗕笉姝竴縐嶇被鍨嬬殑鑷姩杞崲鑰屼笖鎭板ソ鍑芥暟鍙堣閲嶈澆鐨勬椂鍊欏氨鍙戠敓浜嗭紝涓嶈繃榪欑鎯呭喌緙栬瘧鍣ㄤ細(xì)鎶楄錛屽叾瀹炲ソ浜庡墠涓縐嶆儏鍐點(diǎn)?br> 
    瑙e喅鏂規(guī)硶鍏跺疄騫朵笉澶嶆潅錛屾兂鍔炴硶鑷繁鎺у埗綾誨瀷杞崲灝辨槸浜嗭紝灝卞儚銆奀涓撳緙栫▼銆嬮噷鎻愬埌鐨勪竴涓噸瑕佸師鍒欙細(xì)“鐭ラ亾鑷繁鍦ㄥ仛浠涔堬紒”鎵浠ュ氨鍙互浣跨敤鍚嶅瓧涓嶅悓浜庤娉曞叧閿瓧浣嗗姛鑳界浉鍚岀殑鍑芥暟鏉ユ浛浠h漿鎹㈣繍綆楃銆傛湁涓粡鍏哥殑渚嬪瓙灝辨槸string綾諱腑鏈夌殑鏄繀欏昏鏄懼紡璋冪敤鐨刢_str()鎴愬憳鍑芥暟鑰岄潪闅愬紡綾誨瀷杞崲銆傚浜庡崟鍙傛暟鏋勯犲嚱鏁幫紝鍙鍦ㄥ嚱鏁板0鏄庡墠鍔犱笂explicit鍏抽敭瀛楋紝灝辮交鏉鵑伩鍏嶄簡闅愬紡綾誨瀷杞崲錛岃屼繚鎸佷簡鏄懼紡綾誨瀷杞崲鐨勫悎娉曟с?img src="http://m.shnenglu.com/CuteSoft_Client/CuteEditor/images/emsmile.gif" align=absMiddle border=0>



TheAnswer 2007-12-24 02:46 鍙戣〃璇勮
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C++ in Details -- Item 1 : const鐨勬紜敤娉?/title><link>http://m.shnenglu.com/theanswerzju/archive/2007/12/24/39458.html</link><dc:creator>TheAnswer</dc:creator><author>TheAnswer</author><pubDate>Sun, 23 Dec 2007 18:42:00 GMT</pubDate><guid>http://m.shnenglu.com/theanswerzju/archive/2007/12/24/39458.html</guid><wfw:comment>http://m.shnenglu.com/theanswerzju/comments/39458.html</wfw:comment><comments>http://m.shnenglu.com/theanswerzju/archive/2007/12/24/39458.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://m.shnenglu.com/theanswerzju/comments/commentRss/39458.html</wfw:commentRss><trackback:ping>http://m.shnenglu.com/theanswerzju/services/trackbacks/39458.html</trackback:ping><description><![CDATA[<p style="FONT-SIZE: 12pt; FONT-FAMILY: courier new">    綆楁槸鍓嶈█錛氬洖澶寸湅鐪嬶紝榪欎竴騫村鏉ヨ鐨凜++涔︿篃涓嶇畻灝戜簡錛屼絾鏄槰澶╄繕鏄Herb Sutter鐨勩奅xceptional C++銆嬬粰鐙犵嫚鎵撳嚮浜嗭紝鍑犱箮姣忔閮借俯榪涜繖浣嶆爣鍑嗗鍛樹細(xì)涓誨腑鐨勯櫡榪涗箣涓紝鏃㈡湁鎯劎錛屽張鏈夊譏琛ヤ笉瓚崇殑嬈e枩鍜屾亶鐒跺ぇ鎮(zhèn)熺殑蹇箰銆傚弽鎬濅竴涓嬶紝鍏跺疄涓嶅皯涓滆タ鑷繁浠ュ墠涔熷湪鍚勭璧勬枡涓湅鍒拌繃錛屼絾娌℃湁鎬葷粨錛屾暣涓狢++鐭ヨ瘑浣撶郴鏉炬暎鑰屽竷婊℃紡媧烇紝鎵浠ュ氨鏈変簡鎶婃妧鏈笂鐨勬葷粨璁板綍涓嬫潵鐨勫康澶達(dá)紝涓鏂歸潰甯嚜宸辯悊娓呮濊礬錛屽彟涓鏂歸潰涔熷彲浠ヤ嬌鎴戠殑space鐪嬭搗鏉ユ枃鍖栧眰嬈¢珮涓浜涳紝鏃犵梾鍛誨悷灝戜竴浜涖備技涔庢湁涓娉曞彨“緇嗚妭鍐沖畾鎴愬氨”錛屼簬鏄垜灝卞彇浜嗕釜“C++ in Details”鐨勫悕瀛楋紝鍐欑殑閮芥槸C++涓殑鎶鏈粏鑺傦紝铏界劧緇嗗井浣嗚偗瀹氱爺絀墮珮闃舵妧鏈殑鍩虹煶銆傚唴瀹瑰拰瑙傜偣閮芥槸鎻村紩鑷榪囩殑Bruce Eckel, Scott Meyers, Herb Sutter絳夊ぇ甯堢殑钁椾綔錛屽彧鏄仛涓暣鐞嗭紝澶у笀浠簲璇ヤ笉浼?xì)鍜屾垜杩欎釜灏忚彍楦熻杈冪増鏉冨惂銆?br> <br>    璦褰掓浼狅紝灝變粠const鐨勬紜敤娉曞紑濮嬪惂銆?)</p> <p style="FONT-SIZE: 12pt; FONT-FAMILY: courier new"> <br>    鎬葷殑鏉ヨ錛宑onst鏈変互涓嬪嚑縐嶄嬌鐢ㄥ満鍚堬紝鍊兼浛浠o紝鎸囬拡錛屽嚱鏁板弬鏁板拰榪斿洖鍊鹼紝綾諱腑鐨刢onst錛岃繖鍑犺呮蹇典笂鏄竴鑷寸殑錛屼絾鏄敤娉曞嵈瀛樺湪鐫緇嗗井鐨勫樊鍒紝涔熸槸鏈枃闇瑕佽鏄庣殑闂銆?br> <br>    1.鍊兼浛浠c傜敤浠ュ彇浠?define瀹炵幇鍊兼浛浠g殑鍏ㄩ儴鍔熻兘錛屼綔涓轟竴縐嶆洿浼樼殑鐢ㄦ硶錛宑onst榪樺彲浠ユ彁渚涚被鍨嬪畨鍏ㄤ互鍙?qiáng)璋冭瘯鏃剁殑渚垮埄锛尵~栬瘧鍣ㄤ篃鍙互榪涜甯擱噺鎶樺彔浼樺寲銆傜紪璇戝櫒閫氬父騫朵笉涓篶onst鍒嗛厤瀛樺偍絀洪棿錛屼絾鍑虹幇鍙朿onst鐨勫湴鍧絳夋搷浣滄椂蹇呴渶榪涜瀛樺偍絀洪棿鍒嗛厤錛岃繖縐嶄笉鑳藉畬鍏ㄩ伩鍏嶅鑷翠簡const鐨勫畾涔夐粯璁や負(fù)鍐呴儴榪炴帴銆傚煎緱娉ㄦ剰鐨勬槸褰揷onst鐢ㄤ簬鏁扮粍鍜岀粨鏋勪綋絳夐泦鍚堟椂鍙剰鍛崇潃涓鍧椾笉鑳芥敼鍙樼殑瀛樺偍鍖哄煙錛屽茍涓嶈兘鍦ㄧ紪璇戞湡闂翠嬌鐢ㄥ畠鐨勫箋?br> <br>    2.鎸囬拡銆傚彲浠ヤ互“*”涓哄垎鐣岀嚎錛宑onst鍑虹幇鍦ㄥ乏渚ф椂淇グ鎸囬拡鎸囧悜鐨勫璞★紝鍙充晶鏃朵慨楗版寚閽堟湰韜殑鍊鹼紝涔熷氨鏄寚閽堥噷瀛樺偍鐨勫湴鍧銆傚彲浠ユ妸涓涓潪const瀵硅薄鐨勫湴鍧璧嬬粰涓涓猚onst鎸囬拡錛屼絾鏄笉鑳芥妸涓涓猚onst瀵硅薄鐨勫湴鍧璧嬬粰涓涓潪const鎸囬拡錛屼笉榪囧瓨鍦ㄤ竴鐐瑰皬灝忕殑渚嬪錛屽氨鏄緥濡俢har *str = "TheAnswer"鍗存槸鍚堟硶鐨勶紝涓嶈繃榪樻槸搴旇閬垮厤榪欑鐢ㄦ硶錛岀敤const char *str = "TheAnswer"鎴栬卌har str[] = "TheAnswer"鍏朵腑涓涓浛浠f洿濂戒竴浜涖?br> <br>    3.鍑芥暟鍙傛暟銆傚嚱鏁板弬鏁頒腑鐨刢onst鎰忓懗鐫鍙橀噺鐨勫垵鍊間笉浼?xì)琚嚱鏁版墍淇敼錛岃繖鏄竴涓嚱鏁頒綔鑰呰岄潪鍑芥暟鐨勮皟鐢ㄨ呯殑宸ュ叿銆傛墍浠ュ綋鍊間紶閫掔殑鏃跺欙紝鍙傛暟鍒楄〃涓殑const瀹屽叏鏄啑浣欑殑錛屽鏋滀竴瀹氶渶瑕侊紝鍒欏彲浠ラ氳繃鍦ㄥ嚱鏁頒綋鍐呭畾涔変竴涓寚鍚戝父閲忓弬鏁扮被鍨嬬殑寮曠敤騫跺垵濮嬪寲涓哄弬鏁版潵綰︽潫鑷繁銆傚綋浼犻掑湴鍧鐨勬椂鍊欙紝棣栧厛閫夋嫨鐨勫簲璇ユ槸浼犻掑紩鐢紝鑰屼笖鏄痗onst寮曠敤銆傛湁浠ヤ笅鍑犱釜濂藉錛屽湪璋冪敤鑰呯湅鏉ワ紝鏁堟灉瀹屽叏絳夊悓浼犲間紶閫掞紝浣嗘槸鍦ㄤ紶閫掑ぇ瀵硅薄鐨勬椂鍊欙紝閬垮厤浜嗘瀯閫犲嚱鏁扮殑寮閿錛屾晥鐜囦笂鏈変紭鍔匡紱鍙﹀const寮曠敤鍙互鎺ュ彈涓涓復(fù)鏃跺璞′綔涓哄弬鏁幫紝榪欎篃鏄寚閽堝拰闈瀋onst寮曠敤鎵鏃犳硶鍋氬埌鐨勶紙鎸囬拡闇瑕佹帴鍙椾竴涓樉寮忕殑鍦板潃錛岃屼復(fù)鏃跺璞℃槸甯擱噺錛屼笉鑳芥妸涓涓父閲忚祴緇欎竴涓潪甯擱噺寮曠敤錛夈?br> <br>    4.鍑芥暟榪斿洖鍊箋傝繖閲岄渶瑕佸尯鍒嗙殑涓滆タ鏇村涓浜涖傚嵆浣挎槸鎸夊艱繑鍥烇紝涔熼渶瑕佸尯鍒嗗唴緗被鍨嬪拰鑷畾涔夌被鍨嬶紝鍓嶈呮槸鍚﹀姞const鏃犳墍璋擄紝鍥犱負(fù)緙栬瘧鍣ㄥ府蹇欐妸榪欎釜榪斿洖鍊間笉璁╁叾鎴愪負(fù)鍙沖鹼紝瀵逛簬鍚庤咃紝const灝遍潪甯擱噸瑕佷簡錛屽洜涓轟竴鑸潵璇達(dá)紝淇敼涓涓氳繃鍊艱繑鍥炵殑鍑芥暟榪斿洖鍊兼繪槸涓浠惰崚璋殑浜嬫儏銆傝繑鍥炲湴鍧鏃朵慨鏀瑰嚱鏁扮殑榪斿洖鍊兼槸鍏鋒湁鍚堢悊鎬х殑錛屾墍浠ラ渶瑕侀氳繃const鏉ュ尯鍒嗭紝濡傛灉榪斿洖鍊煎姞涓婁簡const錛岄偅涔堟妸榪斿洖鍊煎綋宸﹀間嬌鐢ㄦ椂灝辮兘琚紪璇戝櫒鏈夋晥鐨勯樆姝€?br> <br>    5.綾諱腑鐨刢onst銆傝繖閲岃繕闇瑕佷袱灝忕偣鏉ョ湅<br>    (1).綾葷殑const鏁版嵁鎴愬憳銆傞潪static鐨刢onst鏁版嵁鎴愬憳浠呬粎鎰忓懗鐫鍦ㄥ璞$敓鍛芥湡鍐咃紝榪欐槸涓涓父閲忥紝浣嗘槸姣忎釜瀵硅薄鍙互鍖呭惈涓涓笉鍚岀殑鍊鹼紝鎵浠ュ彧鑳藉湪鏋勯犲嚱鏁頒腑瀵瑰叾榪涜鍒濆鍖栵紝涓鑸斁鍦ㄥ垵濮嬪寲鍒楄〃涔嬩腑銆傚綋浣犳兂瑕佷竴涓紪璇戞湡闂寸殑甯擱噺鏃訛紝鍒欓渶瑕佷嬌鐢╯tatic const錛屽茍鍦ㄥ畾涔夌殑鍦版柟渚垮鍏跺垵濮嬪寲錛岃繖鍙互鐢ㄦ潵鍙栦唬浠ュ墠鐨?#8220;enum hack”鐨勫皬鎶婃垙銆?br>    (2).const瀵硅薄鍜屾垚鍛樺嚱鏁般傚鏋滃0鏄庝竴涓垚鍛樺嚱鏁頒負(fù)const錛屽垯璇ュ嚱鏁板彲浠ヤ負(fù)涓涓猚onst瀵硅薄鎵璋冪敤錛屽煎緱娉ㄦ剰鐨勬槸鍦ㄥ畾涔夊嚱鏁扮殑鏃跺欒閲嶇敵const璇存槑銆傜敱浜巆onst鎴愬憳鍑芥暟鍙互鍚屾椂涓篶onst鍜岄潪const瀵硅薄鎵浣跨敤錛屾墍浠ュ簲璇ユ妸涓嶄慨鏀規(guī)暟鎹垚鍛樼殑浠諱綍鍑芥暟閮藉0鏄庝負(fù)const銆?br> <br>    const鍙互鐗墊壇鍑轟笉灝戣繛甯﹂棶棰橈紝榪欐槸涓嬮潰鐨勪富瑕佸唴瀹廣?br> <br>    1.C涓殑const銆傚氨鍍忛┈鍏嬫濊鐨?#8220;鐗╄川鍐沖畾鎰忚瘑錛屾剰璇嗗弽浣滅敤浜庣墿璐?#8221;錛孋++涓殑涓嶅皯姒傚康涔熸笚閫忓洖浜咰璇█錛宑onst灝辨槸鍏朵腑涓涓備絾鏄痗onst鍦–涓殑鍚箟浠呬粎涓轟竴涓笉鑳借鏀瑰彉鐨勬櫘閫氬彉閲忥紝鐢氳嚦涓嶈兘琚湅浣滅紪璇戞湡甯擱噺錛屽茍涓斿湪C涓璫onst琚粯璁や負(fù)鏄閮ㄨ繛鎺ワ紝鎬繪槸浼?xì)鍒嗛厤涓鍧楀瓨鍌ㄥ尯鍩熴傛墍浠涓殑const鐢ㄥ灝辨瘮C++灝忓緱澶氫簡銆?br> <br>    2.涓存椂瀵硅薄銆傚鏋滀竴涓璞¤鍒涘緩錛岃屽張涓嶆槸鍦ㄥ爢涓婅鍒涘緩鐨勶紝鑰屼笖榪樻病鏈夊悕瀛楋紝閭d箞榪欎釜瀵硅薄灝辨槸涓存椂瀵硅薄銆備竴鑸湪涓轟簡鍑芥暟璋冪敤鑳藉鎴愬姛鑰岃繘琛岄殣寮忕被鍨嬭漿鎹㈠拰鍑芥暟榪斿洖瀵硅薄鏃剁殑闅愬紡綾誨瀷杞崲鏃朵駭鐢熶復(fù)鏃跺璞°傚墠鑰呭彧鏈夊湪浼犲間紶閫掓垨鑰呮妸瀵硅薄浼犻掔粰澹版槑涓篶onst寮曠敤鐨勫弬鏁版椂鎵嶄細(xì)鍙戠敓銆?br> <br>    3.mutable鍜寁olatile銆傝繖鏄袱涓拰const鏈夊瘑鍒囧叧緋葷殑鍏抽敭瀛椼傚湪綾葷殑澹版槑閲屼嬌鐢╩utable錛屽彲浠ユ寚瀹氫竴涓壒瀹氱殑鏁版嵁鎴愬憳鍙互鍦ㄤ竴涓猚onst瀵硅薄閲岃鏀瑰彉錛岃屼笖鎶婅繖縐嶅父閲忔х殑緙轟箯鍏紑鍒頒簡綾繪帴鍙d箣涓紝褰撶劧榪欓噷闈㈣繕娑夊強(qiáng)鍒版寜浣峜onst鍜屾寜閫昏緫const鐨勬蹇靛樊鍒倂olatile鍒欏憡璇夌紪璇戝櫒涓嶈鎿呰嚜瀵硅鏁版嵁榪涜浼樺寲錛屽洜涓哄彲鑳藉瓨鍦ㄤ笉鍙煡鐨勭幆澧冩敼鍙樻鍙橀噺鐨勫彲鑳姐?img src="http://m.shnenglu.com/CuteSoft_Client/CuteEditor/images/emsmile.gif" align=absMiddle border=0></p> <br> <img src ="http://m.shnenglu.com/theanswerzju/aggbug/39458.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://m.shnenglu.com/theanswerzju/" target="_blank">TheAnswer</a> 2007-12-24 02:42 <a href="http://m.shnenglu.com/theanswerzju/archive/2007/12/24/39458.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item></channel></rss> <a href="http://m.shnenglu.com/">青青草原综合久久大伊人导航_色综合久久天天综合_日日噜噜夜夜狠狠久久丁香五月_热久久这里只有精品</a> <div style="position:fixed;left:-9000px;top:-9000px;"><font id="pjuwb"></font><button id="pjuwb"><pre 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