1. 鐢?c/c++ 鎻忚堪 strstr 鍑芥暟鐨勫嚱鏁頒綋
2. 灝嗕竴涓?1M -10M 鐨勬枃浠訛紝鍊掕繃鏉ュ瓨鍌ㄥ埌鍙︿竴涓枃浠訛紝灝辨槸鍓嶄竴涓枃浠剁殑鏈鍚庝竴涓?
瀛楃瀛樺埌鏂版枃浠剁殑絎竴涓瓧絎︼紝浠ユ綾繪帹銆?
3. 灝嗕竴涓枃浠舵寜琛屾帓搴忥紝姣旇緝姣忎竴琛岀殑絎竴涓瓧絎︼紝瀛楃灝忕殑闈犲墠錛岀浉鍚屽啀姣旇緝涓嬩竴涓?
緇撴灉涔熷瓨鍒頒竴涓柊鏂囦歡閲?
鏁版嵁搴撻儴鍒嗭細(xì)
3寮犺〃錛屼竴涓敤鎴瘋〃錛岀敤鎴風(fēng)粍琛紝榪樻湁涓涓紝鐢ㄦ埛鍜岀粍鐨勫叧緋昏〃
棰樼洰
娣誨姞錛屽垹闄わ紝淇敼銆?
涓涓鏉傛煡璇紝瑕佹眰鍐?sql 璇彞銆?br />
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#include <memory.h>
class Blanks
{
public:
聽(tīng)聽(tīng)聽(tīng) Blanks(){}
聽(tīng)聽(tīng)聽(tīng) void *operator new( size_t stAllocateBlock, char chInit );
};
void *Blanks::operator new( size_t stAllocateBlock, char chInit )
{
聽(tīng)聽(tīng)聽(tīng) void *pvTemp = malloc( stAllocateBlock );
聽(tīng)聽(tīng)聽(tīng) if( pvTemp != 0 )
聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) memset( pvTemp, chInit, stAllocateBlock );
聽(tīng)聽(tīng)聽(tīng) return pvTemp;
}
int main()
{
聽(tīng)聽(tīng)聽(tīng) Blanks *a5 = new( 0xa5 ) Blanks;
聽(tīng)聽(tīng)聽(tīng) return a5 != 0;
}
涓誨嚱鏁扮殑new鏄被涓璶ew鎿嶄綔絎﹂噸杞姐?br />浣嗘槸new鍚庨潰鍙湁涓涓弬鏁?xa5,
鑰岀被涓嚱鏁扮殑澹版槑鏄痸oid *operator new( size_t stAllocateBlock, char chInit );涓や釜鍙傛暟銆?br />鎬庝箞浼?xì)璋冪敤杩欎釜绫诲唴鐨勫憿锛?br />
榪欐槸涓涓吀鍨嬬殑瀹氫綅new錛?br />涓婇潰鍚勪釜鐤戠偣錛岃В閲婂涓?
1. 閲嶈澆new鎿嶄綔絎︾涓涓弬鏁板繀欏繪槸size_t綾誨瀷鐨勩?br />銆void operator new(size_t)
聽(tīng)聽(tīng)聽(tīng) void operator new(size_t , Blanks*)
2.聽(tīng)聽(tīng)聽(tīng)聽(tīng) Blanks *a5 = new( 0xa5 ) Blanks;鍒嗗埆琛ㄧず
銆銆0xa5灝辨槸鍙傛暟char chInit 銆?br />銆銆size_t stAllocateBlock灝辨槸綾葷殑澶у皬銆?br />3.聽(tīng)聽(tīng)聽(tīng) 鐒跺悗錛岀敤0xa5鍒濆鍖栧垎閰嶇殑閭ｅ潡鍐呭瓨銆?br />
聽(tīng)聽(tīng)聽(tīng) Blanks *a5 = new( 0xa5 ) Blanks;
榪欎釜琛ㄨ揪寮忓姩浣滃涓嬶細(xì)
A.璋冪敤Blanks鐨勬搷浣滅銆new(size_t, Blanks*)
B.璋冪敤榛樿鐨勬瀯閫犲嚱鏁板垵濮嬪寲瀵硅薄
C.鐢˙lanks瀵硅薄鍦板潃鍒濆鍖朼5.
銆銆
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char *GetString2(void)
{
char *p = "hello world";
return p;
}
void Test5(void)
{
char *str = NULL;
str = GetString2();
cout<< str << endl;
}
鍐欏嚭杈撳嚭緇撴灉錛屽茍鍒嗘瀽鍘熷洜銆?br>褰撴妸char *p 錛?“hello world ”鏀規(guī)垚 char p[] = "hello world"
杈撳嚭緇撴瀯鍜屽師鍥犮?br>
榪欎釜棰樼洰闈炲父綆鍗曘?br>浣嗘槸錛岃寰堟竻妤氱殑絳旀槑鐧界‘涓嶆槸寰堝鏄撱?br>1.紼嬪簭鎵ц緇撴瀯鏄痟ello world.
鐢╟har *p = "hello world"榪欑褰㈠紡鍘誨垵濮嬪寲鍙橀噺銆俻 鎸囧悜闈?rùn)鎬佸瓨鍌ㄥ尯銆傛墍浠ュ彲浠ユ墽琛屻?br>
2.鏄湪鏍堝唴鍙橀噺銆傛墍浠ワ紝鏃犳硶姝ｅ父鏄劇ず銆?br>
鎬庝箞璇誨彇瀹夊叏鏁扮粍閫熷害鏈蹇紵
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