c++编译错误汇总

1. 出现 undefined reference to typeinfo for xxxx

在定义抽象函数的时候 virtual函数的定义有问题。

You must either provide a definition for virtual functions in your base class or declare them pure：

class Accel {
public:
    virtual void initialize(void) = 0;        //either pure virtual
    virtual void measure(void) = 0; 
    virtual void calibrate(void) {};          //or implementation 
    virtual const int getFlightData(byte) {};
};