1銆佸ご鏂囦歡鏄?span lang="EN-US">C鏍煎紡錛屼絾鏄嚱鏁板疄鐜版槸C++鐨勩?span lang="EN-US">
瑙ｅ喅鍔炴硶錛氬湪.h鏂囦歡涓坊鍔?/span>
#if __cplusplus extern "C" { #endif /* 浠ｇ爜琛?span lang="EN-US"> */
#if __cplusplus
}
#endif
2銆佸ご鏂囦歡鐨勫嚱鏁板０鏄庡弬鏁扮被鍨嬩笌cpp鏂囦歡涓殑鍑芥暟瀹氫箟涓嶄竴鑷?span lang="EN-US">
璋冩暣涓轟竴鑷村嵆鍙?span lang="EN-US">
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鍦ㄥ凡緇忓垎閰嶇殑鍔ㄦ佸唴瀛樼┖闂翠笂浣跨敤
new
鍒涘緩鏂扮殑瀵硅薄銆傝繖縐嶅艦寮忕殑
new
琛ㄨ揪寮忓氨鏄?/span>
placement new expression
銆?/span>
2.聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)
浣跨敤鏍煎紡
new(place_address) type_specifier
鈶?span style="FONT: 7pt 'Times New Roman'">聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)
place_address
錛屽凡緇忓紑杈熺┖闂寸殑鎸囬拡
鈶?span style="FONT: 7pt 'Times New Roman'">聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)
type_specifier
錛屾柊鍒嗛厤瀵硅薄鐨勭被鍨?/span>
3.聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)
瀹炰緥
int *pBuff聽(tīng) = new int[1000];
long *pb聽(tīng)聽(tīng) = new(pBuff) long;聽(tīng)聽(tīng)聽(tīng)聽(tīng) //
鍗沖皢
pBuff
鍐呯殑涓鍧楀ぇ灝忎負(fù)
sizeof(long)
鐨勫唴瀛樺尯鍩熺殑
聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) //
浣跨敤鏉冪粰
pb
鎸囧悜鐨勫璞°?/span>
4.聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)
浣跨敤娉ㄦ剰
鈶?span style="FONT: 7pt 'Times New Roman'">聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)
闇瑕?/span>
#include<new>
鈶?span style="FONT: 7pt 'Times New Roman'">聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)
涓嶉渶瑕?/span>
delete pb
錛?/span>
聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) //
鍥犱負(fù)騫舵病鏈変負(fù)
pb
寮杈熶竴鍧楀唴瀛樸?/span>
pb
鎸囧悜鐨勫璞″彧鏈変嬌鐢ㄦ潈
濡傛灉浣跨敤
delete []pBuff;聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) //
鎰忓懗鐫鍏跺唴瀛樼┖闂翠笂鐨勬墍鏈夊璞￠兘琚?/span>
kill
銆?/span>
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1 銆佷笌鏁版嵁瀵硅薄鐩稿叧鐨勫兼湁涓ょ錛?/span>
n聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) 鏁版嵁鍊?/span>
鍗沖瓨鍌ㄥ湪鏌愪釜鍐呭瓨鍦板潃涓殑鏁版嵁鏈韓銆?/span>
n聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) 鍦板潃鍊?/span>
鍗寵鏁版嵁瀵硅薄鐨勫瓨鍌ㄤ綅緗?/span>
2 銆?/span> lvalue 涓?/span> rvalue
n聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) lvalue 閫氬父鎸囩殑鏄彲浠ュ鍧騫朵笖鍙互瀵硅鍦板潃鍐呭瀛樺偍鐨勫璞¤繘琛屽啓鎿嶄綔 (writeable) 銆傚彲浠ョ湅浣?/span> location value 銆?/span>
n聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) rvalue 閫氬父鎸囩殑鏄偅浜涜兘澶熸彁渚涙暟鎹肩殑鏁版嵁錛屽嵆浠庢煇涓?/span> mem 涓鍑虹殑 value 銆傚彲浠ヨ涓烘槸 read value 銆?/span>
3 銆佹枃瀛楀父閲忥紙 literate const 錛変笌鍙橀噺錛?/span> variable 錛?/span>
n聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) 鏂囧瓧甯擱噺
鍗抽氬父鎸囩殑鏁板瓧錛?/span> 1 錛?/span> 200 錛屻傘傘傦級(jí)銆傝鏁版嵁瀵硅薄鍒嗛厤鍦ㄥ父閲忓唴瀛樺尯鍩燂紝涓嶅彲浠ュ鍧錛屼篃灝辨槸涓嶅彲浠ラ氳繃鎿嶄綔瀹冪殑鍦板潃鍊兼潵鍙樻洿鐨勬暟鎹璞°傚洜姝や笉鑳戒綔涓?/span> lvalue 鍑虹幇錛屽彧鑳芥槸 rvalue
n聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) 鍙橀噺
鍙互瀵誨潃銆傞氳繃鍙橀噺鍚嶅氨鍙互鏀瑰彉璇ユ暟鎹湴鍧鐨勫唴瀹廣傛墍浠ュ彲浠ユ垚涓?/span> lvalue 銆?/span> rvalue
鎬葷粨錛?/span>
u聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) lvalue 錛氬彲浠ラ氳繃鏁版嵁瀵硅薄鑷韓鍦板潃鏉ユ敼鍙樻暟鎹璞″肩殑鏁版嵁瀵硅薄錛岃姹傝瀵硅薄鍙互瀵誨潃銆?/span>
u聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) rvalue 錛氳兘澶熸彁渚涙暟鎹璞℃湰韜暟鍊肩殑鏁版嵁瀵硅薄錛岃瀵硅薄涓嶄竴瀹氬彲浠ュ鍧
u聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) 鐢辨搷浣滅鍐沖畾闇瑕佷粈涔堢被鍨嬬殑鏁版嵁鍊肩被鍨?/span>
娉ㄦ剰錛?/span>
lvalue 涓殑 鈥檒鈥?/span> 涓嶆槸 left 鐨勬剰鎬濓紝鏃笉鏄寚鍦ㄦ搷浣滅宸﹁竟銆傚悓鏍?/span> 鈥檙鈥?/span> 涓嶆槸 right
聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) 渚嬪錛?/span>
x++;
聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) ++x;
聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) 涓や釜琛ㄨ揪寮忓潎瑕佹眰 x 鏄?/span> lvalue 銆?/span>
浣跨敤涓句緥錛?/span>
鈶?聽(tīng)聽(tīng)聽(tīng)聽(tīng) 0=1 錛?/span> 聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) //error, 0 涓嶆槸 lvalue
鈶?聽(tīng)聽(tīng)聽(tīng)聽(tīng) x+0.1*y=z;聽(tīng)聽(tīng)聽(tīng)聽(tīng) //error, 鍦ㄨ祴鍊艱繍綆楃宸﹁竟鐨勫簲璇ヤ負(fù) lvalue
鈶?聽(tīng)聽(tīng)聽(tīng)聽(tīng) const int size=4;
size=10;聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) //error, 鏁版嵁瀵硅薄鍦板潃鍐呭涓嶅彲浠ユ敼鍙橈紝鍗充笉鏄?/span> writeable
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