if (_loc_update.GetLocaleT()->locinfo->lc_handle[LC_CTYPE] == _CLOCALEHANDLE)
{
/* C locale: easy and fast */
while (count < n)
{
*pwcs = (wchar_t) ((unsigned char)s[count]);
if (!s[count])
return count;
count++;
pwcs++;
}
return count;
}
鑰寁c鐨勯粯璁ocal淇℃伅灝辨槸_CLOCALEHANDLE,浜庢槸涓枃瀛楃寰堟?zhèn)插墽鐨勮铦{鎹㈡垚浜?/span>鑾悕鍏跺鐨勪竴涓蹭笢瑗褲俫oogle浜?jiǎn)涓嬪Q屼技涔庡緢澶氫漢紕板埌浜?jiǎn)杩欎釜闂锛屼篃娌℃湁鐗瑰埆濂界殑瑙ｅ喯x柟妗堬紝瑕佷笉鐩存帴unicode,瑕佷笉姣忔璋冪敤fstream鍓嶅悗閮借皟鐢ㄤ竴閬峴etlocal錛屽浠ｇ爜鐨勪鏡鍏ユч兘寰堝己銆?br> 鎴戝仛浜?jiǎn)涓獮畞瑁呯殑瑙ｅ喯x柟妗堬紝浣跨敤涓ā鏉跨被瀵筬stream鍋氫竴涓獁rapper錛屼唬鐮佸涓?{
/* C locale: easy and fast */
while (count < n)
{
*pwcs = (wchar_t) ((unsigned char)s[count]);
if (!s[count])
return count;
count++;
pwcs++;
}
return count;
}
template<class T>
struct fstream_fix
:public T
{
fstream_fix(){};
template<class T1>
fstream_fix(T1 v1){
setlocale(LC_CTYPE, ".936");
T::open(v1);
setlocale(LC_CTYPE, 0);
}
template<class T1,class T2>
fstream_fix(T1 v1,T2 v2){
setlocale(LC_CTYPE, ".936");
T::open(v1,v2);
setlocale(LC_CTYPE, 0);
}
template<class T1>
void open(T1 v1){
setlocale(LC_CTYPE, ".936");
T::open(v1);
setlocale(LC_CTYPE, 0);
}
template<class T1,class T2>
void open(T1 v1,T2 v2){
setlocale(LC_CTYPE, ".936");
T::open(v1,v2);
setlocale(LC_CTYPE, 0);
}
};
#define ifstream fstream_fix<ifstream>
#define ofstream fstream_fix<ofstream>
OK.瀹岀編錛屽鍘熼」鐩病鏈変換浣曞獎(jiǎng)鍝嶏紝ifstream fi(filepath);filepath涓惈鏈変腑鏂囦篃鑳芥甯稿伐浣滀簡(jiǎn)銆?) 褰撶劧瑕佹敞鎰忕殑鏄紝鍦ㄥ畯瀹氫箟涔嬪悗錛屽氨涓嶈兘鍐峣nclude <fstream>錛屼笉鐒跺彲鑳戒細(xì)鏈夌紪璇戦敊璇?br>struct fstream_fix
:public T
{
fstream_fix(){};
template<class T1>
fstream_fix(T1 v1){
setlocale(LC_CTYPE, ".936");
T::open(v1);
setlocale(LC_CTYPE, 0);
}
template<class T1,class T2>
fstream_fix(T1 v1,T2 v2){
setlocale(LC_CTYPE, ".936");
T::open(v1,v2);
setlocale(LC_CTYPE, 0);
}
template<class T1>
void open(T1 v1){
setlocale(LC_CTYPE, ".936");
T::open(v1);
setlocale(LC_CTYPE, 0);
}
template<class T1,class T2>
void open(T1 v1,T2 v2){
setlocale(LC_CTYPE, ".936");
T::open(v1,v2);
setlocale(LC_CTYPE, 0);
}
};
#define ifstream fstream_fix<ifstream>
#define ofstream fstream_fix<ofstream>
]]>
00FB1202 mov ecx,dword ptr ds:[00FB543Ch]
00FB1208 sub ecx,dword ptr ds:[00FB5438h]
00FB120E mov eax,66666667h
00FB1213 imul ecx
00FB1215 sar edx,5
00FB1218 mov ecx,edx
00FB121A shr ecx,1Fh
00FB121D add ecx,edx
鍏跺疄榪欐槸褰撹闄ゆ暟鏄父閲忔椂闄ゆ硶鐨勭紪璇戝櫒浼樺寲銆倄/50h00FB1208 sub ecx,dword ptr ds:[00FB5438h]
00FB120E mov eax,66666667h
00FB1213 imul ecx
00FB1215 sar edx,5
00FB1218 mov ecx,edx
00FB121A shr ecx,1Fh
00FB121D add ecx,edx
浼樺寲鏂規(guī)硶鏄妸闄ゆ硶杞崲鎴愪箻浠ヨ闄ゆ暟鐒跺悗鍙崇Щ.
x/y => x*(1 /y) => x* ((1<<37) /((1<<37)* y) ) =>x * ((1<<37)/ y)>>37
涓轟簡(jiǎn)鍙栨暣鏁堟灉錛屾渶緇堢粨鏋滃皢浼?xì)鏄?/span>x/y = x * ((1<<37 +y-1 )/ y)>>37
鐢變簬y 鏄父閲忥紝鍦ㄧ紪璇戞湡錛岀紪璇戝櫒灝卞彲浠ヨ綆楀嚭((1<<37 +y-1 )/ y)鐨勫箋?br>閭ｄ箞瀹為檯璁＄畻鏃訛紝緙栬瘧鏈熷氨鍙互鎶?x/y 杞崲鎴?x *M >> 37, M = ((1<<37 +y-1 )/ y)
闄や互0x50 M = (1<<37 + 0x4F)/0x50 = 0x66666667
閭ｄ箞x / 0x50鐩稿綋浜?(x* 0x66666667)>>37
]]>
]]>