错误:没有匹配的函数可以调用sth [英] error: no matching function for call to sth

问题描述

我想在另一个类中使用一个类的方法，但是在下面出现错误，这是什么问题?

TIA

错误:没有匹配的函数可以调用"PositionInfo :: PositionInfo()"

这是我的代码:

 PositionInfo Pos;
 double  metr = Pos.GetBallDistToTeammate( 5 );///我在这里遇到了错误

和PositionInfo.h类为:

 PositionInfo(WorldState * pWorldState，InfoState * pInfoState); 

和PositionInfo.cpp类为:

  const   double & GetBallDistToTeammate(Unum unum)常量 {Assert(unum >   0 )； 返回 GetBallDistToPlayer(unum); } 

解决方案

您必须执行以下任一操作:

• 定义不带PositionInfo类参数的构造函数(即PositionInfo::PositionInfo()).

或

• 在Pos变量定义(例如PositionInfo Pos(NULL, NULL);)中使用您已经定义的构造函数.

PositionInfo类应类似于这个:

class PositionInfo
{
public:
    PositionInfo() {};   // replace with your constructor

    double GetBallDistToPlayer(Unum unum) const 
    { 
        return X;  // return your value here
    }

    double GetBallDistToTeammate(Unum unum) const
    {
        return GetBallDistToPlayer(unum);
    }
};

我认为您可能需要定义一个采用int的GetBallDistToTeammate函数，或将参数转换为Unum ...

hi,
i want to use a method of a class in another class,but i get error below,whats the problem?

TIA

error: no matching function for call to ‘PositionInfo::PositionInfo()’

here is my code:

PositionInfo Pos;
double metr=Pos.GetBallDistToTeammate(5);///i got the error here

and PositionInfo.h class is:

PositionInfo(WorldState *pWorldState, InfoState *pInfoState);

and PositionInfo.cpp class is:

const double & GetBallDistToTeammate(Unum unum) const { Assert(unum > 0); return GetBallDistToPlayer(unum); }

解决方案

You must either:

• define the contructor without arguments for the PositionInfo class (i.e. PositionInfo::PositionInfo()).

or

• Use your already defined contructor in the Pos variable definition (e.g. PositionInfo Pos(NULL, NULL);).

The class PositionInfo should be like this:

class PositionInfo
{
public:
    PositionInfo() {};   // replace with your constructor

    double GetBallDistToPlayer(Unum unum) const 
    { 
        return X;  // return your value here
    }

    double GetBallDistToTeammate(Unum unum) const
    {
        return GetBallDistToPlayer(unum);
    }
};

I think that perhaps you need to define a GetBallDistToTeammate function that takes an int, or cast the parameter to a Unum...

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