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聽(tīng)1聽(tīng)//聽(tīng)C2782b.cpp
聽(tīng)2聽(tīng)//聽(tīng)compile聽(tīng)with:聽(tīng)/clr
聽(tīng)3聽(tīng)generic<typename聽(tīng)T>聽(tīng)void聽(tīng)gf(T,聽(tīng)T)聽(tīng){聽(tīng)}
聽(tīng)4聽(tīng)
聽(tīng)5聽(tīng)int聽(tīng)main()聽(tīng){
聽(tīng)6聽(tīng)聽(tīng)聽(tīng)聽(tīng)gf(1,聽(tīng)'c');聽(tīng)//聽(tīng)C2782
聽(tīng)7聽(tīng)聽(tīng)聽(tīng)聽(tīng)//聽(tīng)try聽(tīng)the聽(tīng)following聽(tīng)line聽(tīng)instead
聽(tīng)8聽(tīng)聽(tīng)聽(tīng)聽(tīng)//聽(tīng)gf<int>(1,聽(tīng)'c');
聽(tīng)9聽(tīng)}
10聽(tīng)

妯℃澘涓疄鍙傜殑婕旂粠


鍙互鍏堢湅鐪嬩笅闈竴孌典嬌鐢ㄦā鏉跨殑浠ｇ爜:

聽(tīng)1 template聽(tīng) < typename聽(tīng)T >
聽(tīng)2 聽(tīng)inline聽(tīng)T聽(tīng) const & 聽(tīng)max(T聽(tīng) const & 聽(tīng)a,T聽(tīng) const & 聽(tīng)b) {
 聽(tīng)3 聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) return 聽(tīng)a < b ? b:a;
 聽(tīng)4 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)5
聽(tīng)6 #include聽(tīng) < iostream >
聽(tīng)7 #include聽(tīng) < string >
聽(tīng)8 using 聽(tīng) namespace 聽(tīng)std;
 聽(tīng)9 int 聽(tīng)main() {
 10 聽(tīng)聽(tīng)聽(tīng)聽(tīng) // -------------------姝ｇ‘---------
11 聽(tīng)聽(tīng)聽(tīng)聽(tīng) int 聽(tīng)i = 42 ;
 12 聽(tīng)聽(tīng)聽(tīng)聽(tīng)cout << " Max(7,i) " << ::max( 7 ,i) << endl;
 13
14 聽(tīng)聽(tīng)聽(tīng)聽(tīng) double 聽(tīng)f1 = 3.4 ;
 15 聽(tīng)聽(tīng)聽(tīng)聽(tīng) double 聽(tīng)f2 =- 6.7 ;
 16 聽(tīng)聽(tīng)聽(tīng)聽(tīng)cout << " Max(f1,f2): " << ::max(f1,f2) << endl;
 17
18 聽(tīng)聽(tīng)聽(tīng)聽(tīng) string 聽(tīng)s1 = " abcd " ;
 19 聽(tīng)聽(tīng)聽(tīng)聽(tīng) string 聽(tīng)s2 = " bacd " ;
 20 聽(tīng)聽(tīng)聽(tīng)聽(tīng)cout << " max(s1,s2): " << ::max(s1,s2) << endl;
 21
22 聽(tīng)聽(tīng)聽(tīng)聽(tīng) // -------------------鏈夐棶棰?-------
23 聽(tīng)聽(tīng)聽(tīng)聽(tīng)cout << ::max( 1 , 1.2 ) << endl;聽(tīng) // 榪欏彞浼?xì)鍑洪?/span>
24 聽(tīng)聽(tīng)聽(tīng)聽(tīng)}
25

鍦?span lang="EN-US">VC2005 EE緙栬瘧鐨勬椂鍊欙紝鍑虹幇閿欒錛岄敊璇爜鏄疌2782,鍙互鍦ㄩ檮甯︾殑甯姪涓?o:p>

鏌ョ湅榪欎釜閿欒鐮併?span lang="EN-US">

聽(tīng) 鍙互鐪嬪埌閿欒淇℃伅鏄細(xì)

聽(tīng) 聽(tīng) Error Message

'declaration' : template parameter 'identifier' is ambiguous

The compiler cannot determine the type of a template argument.

聽(tīng)

聽(tīng)聽(tīng)聽(tīng)榪欐剰鎬濇槸璇寸敵鏄庣殑妯℃澘鍙傛暟鏍囪瘑絎︽槸鏈変簩涔夋х殑錛岀紪璇戝櫒鏃犳硶鍐沖畾妯℃澘鍙傛暟鐨勭被鍨嬨?/span>

聽(tīng)聽(tīng)聽(tīng)欏轟究闄勫甫涓婂府鍔╀腑緇欑殑渚嬪瓙濡備笅:

聽(tīng)1聽(tīng)//聽(tīng)C2782.cpp
聽(tīng)2聽(tīng)template<typename聽(tīng)T>
聽(tīng)3聽(tīng)void聽(tīng)f(T,聽(tīng)T)聽(tīng){}
聽(tīng)4聽(tīng)
聽(tīng)5聽(tīng)int聽(tīng)main()聽(tīng){
聽(tīng)6聽(tīng)f(1,聽(tīng)'c');聽(tīng)聽(tīng)聽(tīng)//聽(tīng)C2782
聽(tīng)7聽(tīng)//聽(tīng)try聽(tīng)the聽(tīng)following聽(tīng)line聽(tīng)instead
聽(tīng)8聽(tīng)//聽(tīng)f<int>(1,聽(tīng)'c');
聽(tīng)9聽(tīng)}
10聽(tīng)


瑙ｅ喅鏂規(guī)硶錛?br />聽(tīng)

鍑虹幇2782閿欒鐨勶紝閭ｄ箞鎴戜滑鎬庝箞瑙ｅ喅鍛紵

鍙互鐢ㄤ笅闈笁縐嶆柟娉曪紝

鏂規(guī)硶涓錛氬瀹炲弬榪涜寮哄埗綾誨瀷杞崲錛岃浠栦滑鍙互浜掔浉鍖歸厤

1max(static_cast<double>(1),1.2)

鏂規(guī)硶浜岋細(xì)鏄劇ず鐨勬寚鍑?span lang="EN-US">T鐨勭被鍨?o:p>

max<double>(1,1.2)

鏂規(guī)硶涓夛細(xì)鍙互鎸囧畾涓や釜鍙傛暟鍙互鍏鋒湁涓嶅悓鐨勭被鍨?span lang="EN-US">

閭ｄ箞涓婇潰鐨勬ā鏉夸緥瀛愬彲浠ユ敼鍐欐垚涓嬮潰榪欐牱鐨?/span>

1template聽(tīng)<typename聽(tīng)T1錛宼ypename聽(tīng)T2錛?/span>>
2聽(tīng)inline聽(tīng)T1聽(tīng)max(T1聽(tīng)const&聽(tīng)a,T2聽(tīng)const&聽(tīng)b){
3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)return聽(tīng)a<b?b:a;
4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)}
5

涓婇潰榪欐牱瀹氫箟妯℃澘錛屽氨鍙互浼犻掍笉鍚岀殑鍙傛暟錛屼絾鏄繖鏍峰仛灝卞繀欏昏瀹氫箟濂借繑鍥炵被鍨嬶紝灝辨槸涓婇潰鐨?/span>T1錛岃繖鏄鏂規(guī)硶鐨勭己鐐廣傞櫎姝や箣澶栵紝鍥犱負(fù)涓や釜鍙傛暟綾誨瀷涓嶄竴鏍鳳紝鍦ㄨ繘琛岃繑鍥炵殑鏃跺欙紝浼?xì)鍦ㄦ妸鍙傛?/span>b杞寲鎴?/span>T1綾誨瀷鐨勬椂鍊欒嚜鍔ㄥ垱寤轟竴涓柊鐨勫眬閮ㄥ彉閲忥紝榪欐牱灝變笉鍙互鐢ㄥ紩鐢ㄤ簡(jiǎn)錛屽彧鑳借繑鍥?/span>T1錛岃屼笉鏄?/span>T1 const&銆?/span>

聽(tīng)

涓轟簡(jiǎn)瑙ｅ喅鍙兘榪斿洖T1鍜?/span>T2涓ょ綾誨瀷涔嬩竴鐨勯棶棰橈紝鎴戜滑鍙互鍙﹀鍐嶅姞涓婁竴涓澶栫殑綾誨瀷錛屾殏涓旀垜浠粰浠栧懡鍚嶄負(fù)returnType錛岄偅涔堟柊鐨勬ā鏉垮涓嬶細(xì)
1template聽(tīng)<聽(tīng)typename聽(tīng)returnType錛宼ypename聽(tīng)T1錛宼ypename聽(tīng)T2錛?/span>>
2聽(tīng)inline聽(tīng)returnType聽(tīng)max(T1聽(tīng)const&聽(tīng)a,T2聽(tīng)const&聽(tīng)b){
3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)return聽(tīng)a<b?b:a;
4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)}
5

榪欑鏂瑰紡鐨勬椂鍊欙紝瑕佷嬌鐢?span lang="EN-US">max鏂規(guī)硶灝遍渶瑕佹寚瀹歳eturnType鐨勭被鍨嬶紝

max<int,int,double>(1,1.2),鍥犱負(fù)鍦ㄦ垜浠繖涓緥瀛愰噷闈紝returnType鏄湪絎竴浣嶇疆錛屽悗闈袱涓被鍨嬫槸鍙互鏍規(guī)嵁杈撳叆鍙傛暟綾誨瀷鑷姩婕旂粠錛堝氨鐢ㄨ繖涓瘝鎶婏紝涔︿笂鏄繖涔堝彨鐨勶級(jí)鐨勶紝鎵浠ユ垜浠彲浠ュ彧鎸囧畾涓涓紝灝辨槸榪斿洖鐨勭被鍨嬶紝閭ｄ箞鎴戜滑灝卞彲浠ヨ繖鏍峰啓浜?jiǎn)max<int>(1,1.2).


浠ヤ笂灝辨槸妯℃澘涓弬鏁扮殑婕旂粠浠ュ強(qiáng)鍑虹幇闂鐨勫熀鏈殑瑙ｅ喅鏂規(guī)硶.

聽(tīng) 浠ヤ笂閮ㄥ垎鏉ユ簮浜庨槄璇匯奀錛嬶紜Templates聽(tīng)涓枃鐗堛?/span>




JetSun 2006-04-16 21:20 鍙戣〃璇勮
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