]]>
鍘熷洜鍏抽敭灝卞湪浜庢晥鐜囥係trousstrup璇磋繃錛堝緢緇忓吀錛屽懙鍛碉級(jí)錛欳++鐨勬寚瀵煎師鍒欎箣涓鏄紝涓嶈涓轟笉浣跨敤鐨勭壒鎬т粯鍑轟唬浠鳳紙鍐呭瓨鎴栧鐞嗘椂闂達(dá)級(jí)銆?br />
鍥犱負(fù)閫氬父鎯呭喌涓嬶紝緙栬瘧鍣ㄥ鐞嗚櫄鍑芥暟鐨勬柟娉曚負(fù)錛氱粰姣忎釜瀵硅薄娣誨姞涓涓殣钘忔垚鍛橈紝璇ユ垚鍛樹腑淇濆瓨浜?jiǎn)涓涓寚鍚戝嚱鏁板湴鍧鏁扮粍鐨勬寚閽堬紙縐頒負(fù)铏氬嚱鏁拌〃 virtual function table,vtbl錛夈傝櫄鍑芥暟琛ㄤ腑瀛樺偍浜?jiǎn)湄?fù)綾誨璞¤繘琛屽０鏄庣殑铏氬嚱鏁扮殑鍦板潃銆備緥濡傦紝鍩虹被鍖呭惈涓涓寚閽堬紝鎸囧悜浜?jiǎn)鍩壕c諱腑鎵鏈夎櫄鍑芥暟鐨勫湴鍧琛紝媧劇敓綾誨璞″皢鍖呭惈涓涓寚鍚戠嫭绔嬪湴鍧琛ㄧ殑鎸囬拡錛屽鏋滄淳鐢熺被鎻愪緵浜?jiǎn)铏氬嚱鏁扮殑鏂板畾涔夊Q岃铏氬嚱鏁拌〃灝嗕繚瀛樻柊鍑芥暟鐨勫湴鍧錛屽鏋滄病鏈夐噸鏂板畾涔夛紝鍒欎繚鐣欏師濮嬬増鏈殑鍦板潃銆傝皟鐢ㄨ櫄鍑芥暟鏃訛紝紼嬪簭灝嗘煡鐪嬪瓨鍌ㄥ湪瀵硅薄涓殑vtbl鍦板潃錛岀劧鍚庤漿鍚戠浉搴旂殑鍑芥暟鍦板潃琛ㄣ?br />
鎵浠ユ樉鑰屾槗瑙佺殑鏄紝浣跨敤铏氬嚱鏁版椂錛屽湪鍐呭瓨鍜屾墽琛岄熷害鏂歸潰鏈変竴瀹氱殑棰濆鎴愭湰錛屽寘鎷細(xì)
姣忎釜瀵硅薄閮藉皢澧炲ぇ錛屽澶ч噺涓哄瓨鍌ㄥ湴鍧鐨勭┖闂達(dá)紱瀵規(guī)瘡涓被錛岀紪璇戝櫒閮藉垱寤轟竴涓櫄鍑芥暟鍦板潃琛紙鏁扮粍錛夛紱姣忎釜鍑芥暟璋冪敤閮介渶瑕佹墽琛屼竴姝ラ澶栫殑鎿嶄綔錛屽嵆鍒拌〃涓煡鎵懼湴鍧銆?br />
鎵浠ュ挶浠鍏繪垚鐨勪範(fàn)鎯槸錛屽湪璁捐綾繪椂錛屽彲鑳藉寘鍚竴浜涗笉鍦ㄦ淳鐢熺被閲嶆柊瀹氫箟鐨勬垚鍛樺嚱鏁幫紝閭ｄ箞榪欎簺鍑芥暟灝變笉瑕佽緗負(fù)铏氬嚱鏁般傝繖鏍烽鍏堜細(xì)鏈夋洿濂界殑鏁堢巼錛屽叾嬈¤澹版槑涓鴻櫄鍑芥暟鐨勬垚鍛樺嚱鏁板氨琛ㄦ槑鏄鏈熷湪媧劇敓綾諱腑浼?xì)琚噸鏂板畾涔夌殑锛屽湪闃呰M唬鐮佹椂涔熷皢姣旇緝鏂逛究銆?img src ="http://m.shnenglu.com/firehutter/aggbug/15785.html" width = "1" height = "1" />
]]>
ostream聽&聽operator聽<<聽(ostream聽&聽os,const聽c_name聽&聽obj)
{
os聽<<聽;//聽display聽object聽contentsreturn聽os;
}鍏朵腑c_name鏄被鍚嶃傚鏋滆綾繪彁渚涗簡(jiǎn)鑳藉榪斿洖鎵闇鍐呭鐨勫叕鏈夋柟娉曪紝鍒欏彲鍦ㄦ搷浣滅鍑芥暟涓嬌鐢ㄨ繖浜涙柟娉曪紝榪欐牱渚夸笉浼?xì)灏嗕粬浠畡〗负鍙嬪厓鍑芥曨C簡(jiǎn)銆?br />
瑕佸皢鍗曚釜鍊艱漿鎹負(fù)綾葷被鍨嬶紝闇瑕佸垱寤哄師鍨嬪涓嬫墍紺虹殑綾繪瀯閫犲嚱鏁幫細(xì)
c_name(type_name聽value);鍏朵腑c_name涓虹被鍚嶏紝type_name鏄杞崲鐨勭被鍨嬬殑鍚嶇О銆?br />瑕佸皢綾昏漿鎹負(fù)鍏朵粬綾誨瀷錛岄渶瑕佸垱寤哄師鍨嬪涓嬫墍紺虹殑綾繪垚鍛樺嚱鏁幫細(xì)
operator聽type_name();铏界劧璇ュ嚱鏁版病鏈夊０鏄庤繑鍥炵被鍨嬶紝浣嗗簲榪斿洖鎵闇綾誨瀷鐨勫箋?br />浣跨敤杞崲鍑芥暟鏃惰灝忓績(jī)銆傚彲浠ュ湪澹版槑鏋勯犲嚱鏁版椂浣跨敤鍏抽敭瀛梕xplicit錛屼互闃叉瀹冭鐢ㄤ簬闅愬紡杞崲銆?br />
濡傛灉綾諱嬌鐢╪ew鎿嶄綔絎︽潵鍒嗛厤綾繪垚鍛樻寚鍚戠殑鍐呭瓨錛屽湪璁捐鏃跺簲閲囧彇涓浜涢闃叉帾鏂姐?
- 瀵逛簬鎸囧悜鐨勫唴瀛樻槸鐢眓ew鍒嗛厤鐨勬墍鏈夌被鎴愬憳錛岄兘搴斿湪綾葷殑鏋愭瀯鍑芥暟涓鍏朵嬌鐢╠elete錛岃鎿嶄綔絎﹀皢閲婃斁鍒嗛厤鐨勫唴瀛樸?
- 濡傛灉鏋愭瀯鍑芥暟閫氳繃瀵規(guī)寚閽堢被鎴愬憳浣跨敤delete鏉ラ噴鏀懼唴瀛橈紝鍒欐瘡涓瀯閫犲嚱鏁伴兘搴斿綋浣跨敤new鏉ュ垵濮嬪寲鎸囬拡錛屾垨灝嗗畠璁劇疆涓虹┖鎸囬拡銆?
- 鏋勯犲嚱鏁頒腑瑕佷箞浣跨敤new[]錛岃涔堜嬌鐢╪ew錛岃屼笉鑳芥販鐢ㄣ傚鏋滄瀯閫犲嚱鏁頒嬌鐢ㄧ殑鏄痭ew[]錛屽垯鏋愭瀯鍑芥暟搴斾嬌鐢╠elete[]錛涘鏋滄瀯閫犲嚱鏁頒嬌鐢ㄧ殑鏄痭ew錛屽垯鏋愭瀯鍑芥暟搴旈傜敤delete銆?
- 搴斿畾涔変竴涓垎閰嶅唴瀛橈紙鑰屼笉鏄皢鎸囬拡鎸囧悜宸叉湁鍐呭瓨錛夌殑澶嶅埗鏋勯犲嚱鏁般傝繖鏍風(fēng)▼搴忚兘澶熷皢綾誨璞″垵濮嬪寲涓哄彟涓涓璞°傝繖縐嶆瀯閫犲嚱鏁板師鍨嬪涓嬶細(xì)
className(const聽className聽&)
- 搴斿畾涔変竴涓噸杞借祴鍊兼搷浣滅鐨勭被鎴愬憳鍑芥暟錛屽叾鍑芥暟瀹氫箟濡備笅錛堝叾涓璫_pointer鏄痗_name鐨勭被鎴愬憳錛岀被鍨嬩負(fù)鎸囧悜type_name鐨勬寚閽堬級(jí)銆備笅闈㈢殑鑼冧緥鍋囪浣跨敤new[]鏉ュ垵濮嬪寲鍙橀噺c_pointer錛夛細(xì)
c_name聽&聽c_name::operator聽=聽(const聽c_name聽&聽cn){if聽(this聽==聽&聽cn)return聽*this;delete聽[]聽c_pointer;//聽set聽size聽number聽of聽type_name聽units聽to聽be聽copyiedc_pointer聽=聽new聽type_name[size];//聽then聽copy聽data聽pointed聽to聽by聽cn.c_pointer聽to//聽location聽pointed聽to聽by聽c_pointerreturn聽*this;}
鏈枃瀵規(guī)垜鍓嶉潰鍑犵瘒闅忕瑪涓彁鍒扮殑闂涔熶綔鍑轟簡(jiǎn)涓涓葷粨錛屾劅瑙夊緢鏈夊繀瑕佽涓嬫潵銆?br />浠ヤ笂鍐呭鍘熸枃寮曠敤鑷弬鑰冧功綾嶄腑鍐呭銆?br />
鍙傝冧功綾嶏細(xì)C++PrimerPlus author:Stephen Prata
]]>
class
聽StringBad
{聽聽聽聽
private
:聽聽聽聽聽聽聽聽
char
聽
*
聽str;聽聽聽聽聽聽聽聽
int
聽len;聽聽聽聽聽聽聽聽聽聽聽聽聽
public
:聽聽聽聽聽聽聽聽StringBad(
const
聽
char
聽
*
聽s);聽聽聽聽聽聽聽聽StringBad();聽聽聽聽聽聽聽聽
~
StringBad();聽聽聽聽聽聽聽聽}
;
鍦ㄦ瀯閫犲嚱鏁板拰鏋愭瀯鍑芥暟瀹氫箟褰撲腑鏈夊涓嬪畾涔夛細(xì)
StringBad::StringBad(
const
聽
char
聽
*
聽s)
{聽聽聽聽len聽
=
聽std::strlen(s);聽聽聽聽str聽
=
聽
new
聽
char
聽[len聽
+
聽
1
];聽聽聽聽}
聽StringBad::StringBad()
{聽聽聽聽len聽
=
聽
4
聽;聽聽聽聽str聽
=
聽
new
聽
char
[
4
];聽聽聽聽}
聽StringBad::
~
StringBad()
{聽聽聽聽聽聽聽聽delete聽[]聽str;}
閭ｄ箞鍦ㄧ▼搴忓綋涓鏋滄湁浠ヤ笅浠ｇ爜錛?/p>
StringBad聽sports(
"
Spinach聽Leaves聽Bow1聽for聽bollars
"
);StringBad聽sailor聽
=
聽sports;
浠ヤ笂鐨勭浜屾潯鍒濆鍖栬鍙ュ皢浼?xì)璋冪敤浠涔堟瀯閫犲嚱鏁幫紵璁頒綇錛岃繖縐嶅艦寮忕殑鍒濆鍖栫瓑鏁堜簬涓嬮潰鐨勮鍙ワ細(xì)
StringBad聽sailor聽
=
聽StringBad(sports);
鍥犱負(fù)sports鐨勭被鍨嬩負(fù)StringBad錛屽洜姝ょ浉搴旂殑鏋勯犲嚱鏁板師鍨嬪簲璇ュ涓嬶細(xì)
StringBad(
const
聽StringBad聽
&
);
褰撴垜浠嬌鐢ㄤ竴涓璞℃潵鍒濆鍖栧彟涓涓璞℃椂錛岀紪璇戝櫒灝嗚嚜鍔ㄧ敓鎴愪笂榪版瀯閫犲嚱鏁幫紙縐頒負(fù)澶嶅埗鏋勯犲嚱鏁幫紝鍥犱負(fù)瀹冨垱寤哄璞＄殑涓涓壇鏈級(jí)銆?br />鐜板湪鎴戜滑涓嶅Θ鎬葷粨涓涓嬫墍璋撶殑闅愬紡鎴愬憳鍑芥暟錛屽嵆C++鑷姩鎻愪緵浜?jiǎn)浠ヤ笅杩欎簺鎴愬憳鍑芥晭图?xì)
- 榛樿鏋勯犲嚱鏁幫紝濡傛灉娌℃湁瀹氫箟鏋勯犲嚱鏁般?
- 澶嶅埗鏋勯犲嚱鏁幫紝濡傛灉娌℃湁瀹氫箟銆?
- 璧嬪兼搷浣滅錛屽鏋滄病鏈夊畾涔夈?
- 榛樿鏋愭瀯鍑芥暟錛屽鏋滄病鏈夊畾涔夈?
- 鍦板潃鎿嶄綔絎︼紝濡傛灉娌℃湁瀹氫箟銆?
鐜板湪鎴戜滑鏉ョ湅鐪嬫垜浠病鏈夊畾涔夊鍒舵瀯閫犲嚱鏁扮殑鎯呭喌涓嬭皟鐢ㄩ殣寮忓鍒舵瀯閫犲嚱鏁板皢浼?xì)鍑虹庮C粈涔堟儏鍐點(diǎn)?br />浠庢瀯閫犲嚱鏁板畾涔夌殑浠ｇ爜鐗囨柇鍙互鐪嬪埌錛屽綋涓嬌鐢╪ew鎿嶄綔絎﹀垵濮嬪寲浜?jiǎn)涓涓寚閽坰tr錛岃岄殣寮忕殑澶嶅埗鏋勯犲嚱鏁版槸鎸夊艱繘琛屽鍒剁殑錛岄偅涔堝浜庢寚閽坰tr錛屽皢浼?xì)杩涜濡備笅澶嶅堄灱?xì)
sailor.str聽
=
聽sports.str;
榪欓噷澶嶅埗鐨勪笉鏄瓧絎︿覆錛岃屾槸涓涓寚鍚戝瓧絎︿覆鐨勬寚閽堬紒涔熷氨鏄錛屾垜浠皢寰楀埌涓や釜鎸囧悜鍚屼竴涓瓧絎︿覆鐨勬寚閽堬紒鐢辨浼?xì)漶旂敓鐨勯棶棰槥畣涓嵀a鑰屽柣銆傚綋鍏朵腑涓涓璞¤皟鐢ㄤ簡(jiǎn)鏋愭瀯鍑芥暟涔嬪悗錛屽叾str鎸囧悜鐨勫唴瀛樺皢琚噴鏀撅紝榪欎釜鏃跺欐垜浠鏋滆皟鐢ㄥ彟涓涓璞★紝鍏秙tr鎸囧悜鐨勫湴鍧鏁版嵁浼?xì)鏄粈涔堬紵寰堟槑鏄懼皢浼?xì)鍑虹庮C笉鍙鏂欑殑緇撴灉銆?/p>
鎵浠ョ敱姝ゅ彲瑙侊紝濡傛灉綾諱腑鍖呭惈浜?jiǎn)鋴社敤new鍒濆鍖栫殑鎸囬拡鎴愬憳錛屽簲褰撳畾涔変竴涓鍒舵瀯閫犲嚱鏁幫紝浠ュ鍒舵寚鍚戠殑鏁版嵁錛岃屼笉鏄寚閽堬紝榪欒縐頒負(fù)娣卞害澶嶅埗銆傚洜涓洪粯璁ょ殑嫻呭鍒訛紙鎴栨垚涓烘垚鍛樺鍒訛級(jí)浠呮祬嫻呯殑璧嬪兼寚閽堜俊鎭?/strong>
鎴戜滑鍐嶇湅浠ヤ笅浠ｇ爜鐗囨柇錛屾垜浠◢鍋氫慨鏀癸細(xì)
StringBad聽headline1(
"
Celery聽Stalks聽at聽Midnight
"
);StringBad聽knot;knot聽
=
聽headline1;
榪欓噷鐨勬渶鍚庝竴琛屽皢涓庝互涓婁緥瀛愭湁鎵鍖哄埆錛岀幇鍦ㄦ槸灝嗗凡鏈夊璞¤祴緇欏彟涓涓凡鏈夊璞★紝榪欏皢浼?xì)閲囧彇鍏朵粬鎿嶄綔锛屽嵆鋴社敤閲嶈浇鐨勮祴鍊兼搷浣滅銆傦紙鎴戜滑闇瑕佺煡閬撶殑鏄細(xì)鍒濆鍖栨繪槸浼?xì)璋冪敤澶嶅埗鏋勯犲嚱鏁幫紝鑰屼嬌鐢?鎿嶄綔絎︽椂涔熷彲鑳借皟鐢ㄨ祴鍊兼搷浣滅錛夊洜涓篊++鍏佽瀵硅薄璧嬪鹼紝榪欐槸閫氳繃鑷姩涓虹被閲嶈澆璧嬪兼搷浣滅瀹炵幇鐨勩傚叾鍘熷瀷濡備笅錛?/p>
Class_name聽
&
聽Class_name::
operator
聽
=
聽(
const
聽Class_name聽
&
);
瀹冩帴鍙楀茍榪斿洖涓涓寚鍚戠被瀵硅薄鐨勫紩鐢ㄣ?br />涓庨殣寮忕殑澶嶅埗鏋勯犲嚱鏁頒竴鏍鳳紝闅愬紡鐨勫璞¤祴鍊兼搷浣滅涔熶細(xì)浜х敓鍚屾牱鐨勯棶棰橈紝鍗沖寘鍚簡(jiǎn)浣跨敤new鍒濆鍖栫殑鎸囬拡鎴愬憳鏃訛紝鍙細(xì)閲囩敤嫻呭鍒躲傛墍浠ユ垜浠渶瑕佷嬌鐢ㄥ悓鏍風(fēng)殑瑙ｅ喅鍔炴硶錛?strong>鍗沖畾涔変竴涓噸杞界殑璧嬪兼搷浣滅鏉ュ疄鐜版繁搴﹀鍒躲?/strong>
鎵浠ョ患涓婃墍榪幫紝濡傛灉綾諱腑鍖呭惈浜?jiǎn)鋴社敤new鍒濆鍖栫殑鎸囬拡鎴愬憳錛屾垜浠簲璇ユ樉寮忓畾涔変竴涓鍒舵瀯閫犲嚱鏁板拰涓涓噸杞界殑璧嬪兼搷浣滅鏉ュ疄鐜板叾娣卞害澶嶅埗錛岄伩鍏嶇敱姝ゅ甫鏉ョ殑鎴愬憳澶嶅埗闂
鍙傝冧功綾嶏細(xì)C++PrimerPlus author:Stephen Prata
]]>
]]>