Question

所以我正在使用LPC824，这是一个皮质-m0 +。我试图保持代码与arduino的相似性，我目前卡在串行类。现在我有一个扩展打印类的序列类，如下所示。

Printer.h中

class Printer
{
public:
    Printer();
    unsigned int print(char c);
    virtual unsigned int write(char c) = 0;
}

Printer.cpp

#include "Printer.h"
Printer::Printer()
{
    //Nothing to do yet
}

unsigned int Printer::print(char c)
{
    return write(c);
}

Serial.h

#include "Printer.h"
class Serial : public Printer
{
public:
    Serial();
    static Serial& Serial0();
    unsigned int begin(/*eventually options*/);
    unsigned int write(char c);
}

Serial.cpp

#include "Serial.h"
#include "uart.h"
Serial::Serial()
{
    //Nothing to do yet
}

Serial& Serial::Serial0()
{
    static Serial inst;
    return inst;
}

unsigned int Serial::begin(/*eventually options*/)
{
    uart0init(115200, 0x04, 0x00);
}

unsigned int Serial::write(char c)
{
    uart0send(c);
}

的main.cpp

#include "Serial.h"
void main()
{
    Serial::Serial0().begin();
    while(1)
    {
        Serial::Serial0().write('a');
        Serial::Serial0().print('b');
    }
}

调用write函数将打印出'a'。当我打电话给打印功能时，我的程序挂起。为什么我不能在我的单例上调用print函数，但我可以调用write函数？

单例的派生类调用基类函数失败的原因何在？

0 个答案: