http://m.shnenglu.com/shenhuafeng/
Modern C++ Design鐨勭涓绔犲氨鏄疨olicy Based Class Design,鍙璇ユ妧鏈槸鏁翠釜Loki搴撶殑璁捐鍩虹.榪欑鏂瑰紡鐨勪紭鐐規(guī)槸鑳藉澧炲姞紼嬪簭搴撶殑寮規(guī)у拰鎻愰珮澶嶇敤鎬?
綆鍗曟潵璇村氨鏄?涓涓狿olicy Based Class鐢卞緢澶氬熀鏈殑Policy鏉ョ粍鎴愮殑,姣忎釜Policy Class浠ｈ〃浜嗚澶嶆潅綾?鐩稿澶嶆潅)綾葷殑鏌愪簺琛屼負鎴栬呯壒鎬?鏈夌偣綾諱技浜庣被鐨勭戶鎵匡紝褰撶劧鍜岀被鐨勭戶鎵挎槸涓嶅悓鐨勩?br />閭ｄ箞Policy Based Class鏈変粈涔堢敤鍛紵鎴戜滑鍏堢湅涓嬮潰榪欎釜闂銆?br />鍋囧闇瑕佽璁′竴涓熀紜搴擄紝鍙兘鏄熀浜庢煇涓壒瀹氶鍩熺殑錛岄偅涔堝簱鐨勮璁¤呭氨闇瑕佽冭檻榪欐牱鐨勯棶棰橈紝浠栭渶瑕佸皢鏈潵鐨勫彲鑳界殑闇姹傚姞浠ュ垎綾伙紝鎶借薄鍑哄眰嬈★紝鐒跺悗榪愮敤OO鎬濇兂錛屽笇鏈涜兘澶熸瀯閫犲嚭涓涓紑鍙戠殑緇撴瀯錛屽綋鐒跺叾涓殑component鐨勮璁″綋鐒舵槸瓚婃槸鐏墊椿瓚婂ソ銆?br />鐢ㄤ紶緇熺殑OO璁捐鎬濇兂錛屽彲鑳藉彲浠ヨ璁″嚭涓濂楅潪甯稿畬鍠勭殑綾誨簱 錛屽彲鑳藉寘緗椾竾璞°傚綋鐒剁殑瀵逛簬搴旂敤寮鍙戜漢鍛橀渶瑕佽姳寰堝鏃墮棿鍘誨涔犺繖涓滃寘緗椾竾璞♀濈殑鍩虹綾誨簱銆傝屼笖寰寰榪欐牱鐨勫熀紜搴撲笉鏄氱敤鎬т笉寮哄氨鏄檺鍒舵潯浠跺お澶氾紙渚嬪MFC錛夊彲浠ヨ灝辨槸榪欐牱涓縐嶇被鍨嬬殑搴撱?/p>
涓嬮潰瑕佸睍紺轟竴涓嬭繍鐢ㄥ閲嶇戶鎵夸互鍙奣empletes鏉ュ疄鐜扮殑policy class,涓句竴涓畝鍗曠殑渚嬪瓙錛?br />鍋囧鎴戜滑闇瑕佸彂鏄庝竴涓伅錛屽畠鏈変笉鍚岀殑縐嶇被錛屾湁浣跨敤涓嶅悓鑳芥簮鐨勫伐浣滄柟寮忎互鍙婃湁涓嶅悓鐨勬搷浣滄柟寮忥紝濡傛灉榪愮敤
policy based class鏉ヨ璁＄殑璇濓紝鍙兘鏄繖鏍風殑緇撴瀯錛?br />
templete
<
聽2
聽聽聽聽
class
聽T,聽3
聽聽聽聽templete聽
<
class
>
聽
class
聽Work,聽4
聽聽聽聽templete聽
<
class
>
聽
class
聽OpMethod聽5
>
聽6
class
聽Light聽7
聽聽聽聽:
public
聽Work
<
T
>
,聽8
聽聽聽聽聽聽聽聽OpMethod
<
Light
>
聽9
10
{11
聽聽聽聽T
*
聽xxOp()12
聽聽聽聽
{13
聽聽聽聽聽聽聽聽
if
(Work(T).Status聽
==
聽ACMODE)14
聽聽聽聽聽聽聽聽聽聽聽聽OpMethod(
*
this
);15
聽聽聽聽}
16
}
褰撲綘瀹炰緥鍖栦竴涓狿olicy Based Class鐨勬椂鍊欙紝浣犺繕鍙互緇欏嚭榛樿鐨勫疄鐜幫紝灝卞儚鎴愬憳鍑芥暟澹版槑鍜屽畾涔夋椂鍊欑粰鍑虹殑榛樿鍙傛暟涓鏍楓?/p>
鍥炲ご鏉ョ湅涓涓嬪閲嶇戶鎵垮拰Templetes鐨勭壒鎬э細
澶氶噸緇ф壙錛氭瑺緙轟竴縐嶄竴鎴愪笉鍙樼殑鍙互濂楃敤鐨勪唬鐮侊紝鍦ㄦ煇縐嶅彈鎺х殑鎯呭喌涓嬪皢緇ф壙鐨凜lass緇勫悎璧鋒潵錛堝閲嶇戶鎵垮彧鏄皢浠栦滑鏀懼湪涓璧鳳紝鐒跺悗鎻愪緵涓縐嶈闂柟寮忥級銆俆empletes錛氭湁榪欐牱鐨勭壒鎬с?br />澶氶噸緇ф壙鐢變簬緇ф壙鑷涓狟ase Class錛屾墍浠ュ瀷鍒俊鎭己涔忥紝鑰孴empletes姝ｅ紡鍩轟簬鍨嬪埆鐨勩?br />澶氶噸緇ф壙瀹規(guī)槗鎵╁紶錛岃孴empletes鐨勭壒鍖栦笉瀹規(guī)槗鎵╁紶銆?/p>
姝ｆ槸涓ら」鎶鏈殑浜掕ˉ錛屾墠浣胯繖鏍風殑鎶鏈疄鐜版垚涓哄彲鑳姐?br />Light瀵硅薄緇ф壙澶氫釜policy class,浣垮緱鐗規(guī)у緱浠ュ湪緙栬瘧鏈熼棿瀹氬鹼紝浠庤屽疄鐜癓ight Class鍔熻兘鐨勬墿寮犮?br />鑰孴empletes鎶鏈嬌寰楀ぇ閮ㄥ垎Work浠ュ強OpMethod鑳藉鍏變韓澶ч儴鍒嗗熀紜浠ｇ爜錛岃屽鐗瑰畾鐨勭増鏈疄鐜板畾鍊箋?/p>
榪欐牱鐨勫ソ澶勫氨鏄紝搴旂敤紼嬪簭寮鍙戜漢鍛樺緱浠ュ湪搴旂敤璁捐鏃舵湡錛屼嬌鐢ㄨ繖浜汣lass錛岄夋嫨閫傚悎鑷繁鐨凱olicy緇勮鑷繁鐨勪唬鐮侊紝浠庤屼嬌寰楃▼搴忓ぇ灝忓緱浠ョ簿鍑忥紝榪愯閫熺巼寰椾互鎻愰珮錛岃屼笉蹇呭幓鍖呭惈鏁翠釜鍙堝ぇ鍙堝叏鐨勫熀紜綾誨簱銆?/p>
浠ヤ笂鍙槸涓浜涘涔犵殑蹇冨緱鍜屼綋浼氾紝濡傛灉鏈変笉瀵圭殑鍦版柟錛屽笇鏈涘ぇ瀹跺澶氭寚鏁欍?/p>