#include <string>
using namespace std;
void alert( string msg )
{
cout << msg << endl;
}
void (*GetFunction())(string)
{
return alert;
}
int main()
{
// 鍒氱湅瀹孋++ Primer絎竷绔狅紝鍚堜笂涔︼紝鍐欎釜澶嶆潅鐐圭殑鍑芥暟璇曚竴涓嬶紝鍒氬紑濮嬪嚱鏁板０鏄庝笉鏄繖鏍風(fēng)殑錛屼竴鐐圭偣寰涓婂姞鍚庢潵鎵嶅彉鎴愪簡void (*((*ptr)()))(string)銆?br> //鍐欏畬鍚庡氨鏈夌棰勬劅鈥斺旀槑澶╃湅浜嗕及璁″氨鐪嬩笉鎳備簡錛岃刀绱ц涓嬫潵錛屽懙鍛點?br> // 姝ｅ湪浠嶤#杞珻++錛岃繖鏄湪鍥瓙C++鐗堥噷鐨勭涓綃囨枃绔狅紝鏈夐敊鐨勫湴鏂硅澶у涓嶈緇欓潰瀛愶紝璇ユ媿鐮栨媿鐮栵紱-錛?br>
//ptr鏄竴涓寚閽堬紝浠栨寚鍚戜竴涓嚱鏁幫紝榪欎釜鍑芥暟榪斿洖涓涓寚閽堬紝璇ユ寚閽堟寚鍚戜竴涓嚱鏁幫紝榪欎釜鍑芥暟甯︽湁涓涓猻tring鍙傛暟錛屼絾鏄病鏈夎繑鍥炲?/span>
void (*((*ptr)()))(string) = GetFunction;
//鍐欏畬浜嗗０鏄庣劧鍚庤皟鐢紝鍒氬紑濮嬫垜鍐欑殑鏄?*ptr)()("Hello C++")錛屼竴榪愯緇撴灉鍑烘潵浜嗭紝鎸哄紑蹇冿紝鍙槸鍦ㄩ噸璇諱竴閬嶇殑鏃跺欏彂鐜拌嚜宸卞啓“閿?#8221;浜嗭紝蹇樹簡瑙ｅ紩鐢?img src="http://www.shnenglu.com/Images/dot.gif">鍙槸緇撴灉鎬庝箞鏄鐨勶紵
//鎺ョ潃鍙堝啓浜?*((*ptr)()))("Hi C++")錛孎5錛岀粨鏋滀篃鍑烘潵浜?img src="http://www.shnenglu.com/Images/dot.gif">浜庢槸鍒氫粠鍑芥暟澹版槑涓В鑴卞嚭鏉ョ殑澶ц剳鍙堟檿浜?img src="http://www.shnenglu.com/Images/dot.gif">
(*ptr)()("Hello C++");
(*((*ptr)()))("Hi C++");
//涓轟粈涔堝憿錛岄毦閬撳嚱鏁版寚閽堝湪璋冪敤鏃惰В涓嶈В寮曠敤閮藉彲浠ュ悧錛熶負(fù)浜嗚瘉鏄庤繖涓粨璁猴紝鍐嶅０鏄庝竴涓殑鍑芥暟鎸囬拡璇曚竴涓?/span>
void (*ptrAlert)(string);
ptrAlert = alert;
//涓嶈В寮曠敤
ptrAlert("Hello Alert");
//瑙ｅ紩鐢?/span>
(*ptrAlert)("Hi Alert");
/*
緇撹錛氬嚱鏁版寚閽堝湪璋冪敤鏃惰В涓嶈В寮曠敤閮藉彲浠?br>
鍦ㄧ綉涓婃悳鍒扮殑鐩稿叧璧勬枡錛?br>
鍥寸粫榪欎袱縐嶅啓娉曪紝褰撳垵C89鍒跺畾鐨勬椂鍊欐浘緇忔湁榪囦簤璁恒?*p)();鏄竴縐嶆棫寮忕殑瑙勫畾錛屾棫寮忚瀹氬渾鎷彿宸﹁竟蹇呴』鍏鋒湁“鍑芥暟”綾誨瀷錛屽鏋滄槸鎸囧悜鍑芥暟鐨勬寚閽堬紝
閭ｄ箞蹇呴』鍔犱笂*澹版槑絎︺備絾C89涓嶅啀鎶婂渾鎷彿鐨勫乏杈歸檺瀹氫負(fù)“鍑芥暟”綾誨瀷錛岃屾槸涓涓悗緙琛ㄨ揪寮忋傞偅涔堥棶棰樺氨鏉ヤ簡錛屽鏋減鐨勫兼槸鍑芥暟鍦板潃錛岄偅涔?鍙峰氨鏄０鏄庣錛?br> 浣嗗鏋減鎸囧悜鐨勫唴瀹規(guī)槸鍑芥暟鍦板潃錛?鍙峰氨寰楄鐪嬩綔榪愮畻絎︿簡銆傚悓涓縐嶅艦寮忎細(xì)鏈変袱縐嶈В閲婏紝榪欐槸涓涓煕鐩俱備笉浠呭嚱鏁拌皟鐢ㄥ姝わ紝鎸囧悜鏁扮粍鐨勬寚閽堜篃瀛樺湪榪欑鐭涚浘銆?br> 緙栬瘧鍣ㄤ負(fù)浜嗗鐞嗚繖縐嶆儏鍐靛緱澧炲姞浠ｇ爜錛屾晥鐜囪嚜鐒跺氨闄嶄綆浜嗐備簤璁虹殑鏈鍚庣粨鏋滄槸璋佷篃涓嶈兘鎶婂鏂瑰畬鍏ㄨ鏈嶏紝浜庢槸灝卞共鑴嗕袱縐嶉兘鏀寔浜嗐?br>
璇村疄璇濓紝鎴戞病鎬庝箞鐪嬫噦涓婇潰鐨勮瘽錛屽洜涓轟笉浜嗚ВC89榪欎簺鏍囧噯錛屽彧鏄寰?*p)()瀹規(guī)槗鐞嗚В浜涳紝铏界劧鍐欑潃楹葷儲鐐癸紝浠ュ悗c++紼嬪簭鍐欏浜嗗簲璇ヤ細(xì)鏈夋洿娣辯殑璁よ瘑鍚с?br> */
}
]]>