Cxx中括號操作符的重載舉例及解析
C++項目中，經常會遇到使用重載()操作符的地方，請看下面一個例子：
?
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#include?<iostream>??
using?namespace?std;??
class?Clastype??
{??
????public:??
????????Clastype(int?a)??
????????{??
????????????cout?<<?"Hello?Clastype!"?<<?a?<<?endl;??
????????}??
????????bool?operator?()(int?b)??
????????{??
????????????cout?<<?"Hello?Clastype()!"?<<?b?<<?endl;??
????????????return?true;??
????????}??
};??
int?main()??
{??
????Clastype?a(1);??
????Clastype(2);??
????Clastype?t?=?Clastype(3);??
????t(4);??
????Clastype?*b?=?new?Clastype(5);??
????(*b)(6);??
}??
?
運行結果如下：
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@-desktop:~/test$?g++?-o?o?6.cpp??
@-desktop:~/test$?./o??
Hello?Clastype!1??
Hello?Clastype!2??
Hello?Clastype!3??
Hello?Clastype()!4??
Hello?Clastype!5??
Hello?Clastype()!6 ?
可見，括號操作符的使用為對象加上()操作符。類名直接加()操作符為對象的創建。
Cxx中括號操作符的重載舉例及解析