在Cocos2dx上工作时类中的未定义引用

Question

[尝试构建时出错：

../../../../../../ Classes / MainApp.cpp：64：错误：未定义对'Enemies :: getHealth（）'的引用

在MainApp.cpp中，我尝试创建float b，但是由于敌人-> getHealth（）而导致问题。我把健康作为公共变量，然后就可以直接得到它。但是我也需要一个二传手，所以我必须解决这个getter问题。

MainApp.cpp：

enemy = new Enemies(this, 50); //Works

float a = enemy->health; //Works
float b = enemy->getHealth(); //Doesn't work, when I open that gives error.

MainApp.h：

#include "Enemies.h"    
Enemies* enemy;

Enemies.h：

#ifndef __ENEMIES_H__
#define __ENEMIES_H__

#include "cocos2d.h"

class Enemies 
{
private:
public:
    Enemies(cocos2d::Scene *scene, float healthIn) {
    };
    float health;
    int getHealth();
    void setHealth(int healthIn);
    void setPosition(float x, float y);
};

#endif // !__ENEMIES_H__

Enemies.cpp：

#include "Enemies.h"

USING_NS_CC;

Enemies::Enemies(cocos2d::Scene *scene, float healthIn) {
    visibleSize = Director::getInstance()->getVisibleSize();
    origin = Director::getInstance()->getVisibleOrigin();
    enemySprite = Sprite::create("enemy.png");
    enemySprite->setPosition(Point((visibleSize.width / 2) + origin.x, (visibleSize.height/2) + origin.y));
    scene->addChild(enemySprite);
    health = healthIn;
}

int Enemies::getHealth() {
    return 42;
}

void Enemies::setHealth(int healthIn) {
    health -= healthIn;
}

void Enemies::setPosition(float x, float y) {
    enemySprite->setPosition(Point(x, y));
}

Answer 1

不要两次声明构造函数。以下代码输出42。

#include <iostream>
class Enemies 
{
private:
public:
    Enemies(float healthIn);
    float health;
    int getHealth();
    void setHealth(int healthIn);
    void setPosition(float x, float y);
};

Enemies::Enemies(float healthIn) {
    health = healthIn;
}

int Enemies::getHealth() {
    return 42;
}

void Enemies::setHealth(int healthIn) {
    health -= healthIn;
}

void Enemies::setPosition(float x, float y) {
    //enemySprite->setPosition(Point(x, y));
}

int main()
{
    Enemies * enemy = new Enemies(50); //Works

    float a = enemy->health; //Works
    float b = enemy->getHealth(); //Doesn't work, when I open that gives error.

    std::cout << b << std::endl;
}