无法找到默认构造函数在cpp中初始化成员 [英] cannot find default constructor to initialize member in cpp

问题描述

请帮我这个。我试图解决这个两个小时。
这是我的代码。

  class deviceC {
 
 private：
 deviceA devA; 
 deviceB devB; 
 wayPoint destination，current; 
 
 public：
 deviceC（wayPoint destination1）{
 destination = destination1; 
 devA = deviceA（）; 
 devB = deviceB（）; 
} 
}; 
  

这是错误：

无法找到默认构造函数来初始化成员
'deviceC :: destination'in function deviseC :: destination（wayPoint）

目标和当前

code>类型 wayPoint 没有默认构造函数。

  class deviceC {
 public：
 deviceC（wayPoint destination1）：destination（destination1）{
 devA = deviceA（）; 
 devB = deviceB（）; 
} 
}; 
  

并且IMO，你不需要init devA 和 devB 在构造函数中使用默认构造函数，他们只是调用 operator = 称为。这是我的建议：

  class deviceC {
 private：
 deviceA devA; 
 deviceB devB; 
 wayPoint destination，current; 
 public：
 deviceC（const wayPoint& destination1，const wayPoint& current1）：destination（destination1），current（current1）{} 
}; 
  

Please help me with this. I was trying to fix this for two hours. This is my code.

class deviceC {

private:
    deviceA devA;
    deviceB devB;
    wayPoint destination,current;

public: 
    deviceC(wayPoint destination1){
        destination=destination1;
        devA=deviceA();
        devB=deviceB();
    }
};

This is the error:

cannot find default constructor to initialize member 'deviceC::destination' in function deviseC::destination(wayPoint)

解决方案

You need an initializer list in your constructor, because member destination and current with type wayPoint does not has a default constructor.

class deviceC {
public: 
    deviceC(wayPoint destination1) : destination(destination1) {
        devA=deviceA();
        devB=deviceB();
    }
};

And IMO, you don't need init the devA and devB inside the constructor just with the default constructor, they just call the operator= after their default constructor called. Here's my suggestion:

class deviceC {
private:
    deviceA devA;
    deviceB devB;
    wayPoint destination, current;
public: 
    deviceC(const wayPoint& destination1, const wayPoint& current1) : destination(destination1), current(current1) {}
};

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