摘要：
//13.4 抽像类做界面(Abstract Class As Interface)//13.4.1 抽像基类方案(The Abstract Base-Class Scheme)//13.4.2 抽像基类IDate(Abstract Base-Class IDate)//我们针Date类的公有成员函数提取出来做成纯虚函数，构成一个抽像类IDate,而Date类则继承之//13.4.3 创建Date对像(Creating Date Objects)//13.4.4 子类Date(Subclass Date)//为了适应抽像类作为界面的形式，Date类应包含idate.h文件，直接继承IDate类 阅读全文
摘要：
$MapString="116.310634759589,39.990045537862,46#116.310371735567,39.989799696735005,44#116.310489333624,39.989904135209,43#116.31047961062,39.989998263946,42.5#116.310506600338,39.990206973256,52.5#116.310506600338,39.990206973256,52.5#116.311968822793,39.99050754819,43#116.312106621229,39.9904 阅读全文