（對象）在這個範圍內沒有聲明m_cPoint

Question

我做了一個類的點和一個類的字符。然後我在角色類中使用了點作爲對象。在我的性格類我想設置的功能 「moveCharacter」 點對象，但編譯器給我的錯誤：

character.cpp: In function 'void moveCharacter(double, double, double)': 
character.cpp:17:2: error: 'm_cPoint' was not declared in this scope 
    m_cPoint.setPoint(dX, dY, dZ); 
^

point.h：

#ifndef POINT_H 
#define POINT_H 

#include <iostream> 

class Point 
{ 
    public: 

     Point(const double dX, const double dY, const double dZ); 

     double getX() const { return this->m_dX; } 
     double getY() const { return this->m_dY; } 
     double getZ() const { return this->m_dZ; } 

     void setPoint(const double dX, const double dY, const double dZ); 

     friend std::ostream& operator<<(std::ostream &out, const Point &cPoint); 

    private: 

     double m_dX, m_dY, m_dZ; 

}; 

#endif 

point.cpp：

#include "point.h" 

Point::Point(const double dX, const double dY, const double dZ) 
    : m_dX{dX}, m_dY{dY}, m_dZ{dZ} 
{ 

} 

std::ostream& operator<<(std::ostream &out, const Point &cPoint) 
{ 
    out << "(" << cPoint.getX() << ", " << cPoint.getY() << ", " << cPoint.getZ() << ")"; 
    return out; 
} 

void Point::setPoint(const double dX, const double dY, const double dZ) 
{ 
    this->m_dX = dX; 
    this->m_dY = dY; 
    this->m_dZ = dZ; 

} 

character.h：

#ifndef CHARACTER_H 

#define CHARACTER_H 

#include <iostream> 
#include <string> 

#include "point.h" 

class Character 
{ 
    public: 

     Character(const std::string strName, const Point &cPoint); 

     friend std::ostream& operator<<(std::ostream &out, const Character &cCharacter); 

     std::string getName() const { return this->m_strName; } 
     Point getLocation() const { return this->m_cPoint; } 

     void moveCharacter(const double dX, const double dY, const double dZ); 

    private: 

     std::string m_strName; 
     Point m_cPoint; 

}; 

#endif 

character.cpp：

#include "character.h" 

Character::Character(const std::string strName, const Point &cPoint) 
    : m_strName{strName}, m_cPoint{cPoint} 
{ 

} 

std::ostream& operator<<(std::ostream &out, const Character &cCharacter) 
{ 
    out << cCharacter.getName() << " is at location: " << cCharacter.getLocation(); 
    return out; 
} 

void moveCharacter(const double dX, const double dY, const double dZ) 
{ 
    m_cPoint.setPoint(dX, dY, dZ); 
} 

Answer 1

變化

void moveCharacter(const double dX, const double dY, const double dZ) 

到

void Character::moveCharacter(const double dX, const double dY, const double dZ) 

所以這是有類成員變量的範圍，而不是一個獨立的功能