初始化对象时体系结构的未定义符号

Question

我试图在名为“ world”的类中创建对象“ Person”的实例。

但是，每当我尝试构建项目时，都会出现以下错误：

g++ main.cpp world.cpp Colony.cpp Person.cpp -lsfml-graphics -lsfml-window -lsfml-system -o run
Undefined symbols for architecture x86_64:
  "Person::Person(int, int, bool, float, sf::Color)", referenced from:
      world::populate(int, std::__1::uniform_int_distribution<float>&, std::__1::uniform_int_distribution<float>&, std::__1::linear_congruential_engine<unsigned int, 48271u, 0u, 2147483647u>&) in world-6df84d.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [make] Error 1

我创建此实例的部分如下：

Person p(0, 0, false, 5.0f, sf::Color::Green);

我的world.cpp文件的顶部包含以下内容

#include <random>
#include <math.h>
#include "world.h"
#include "Person.h"

world::world(sf::Sprite mapSpr, std::string& mapRef)
{
        worldMap = mapSpr;
        if(!mapImage.loadFromFile(mapRef)){
                std::cout << "Error; could not load map image" << std::endl;
        }
}

我的Person.h文件如下：

#include <SFML/Graphics.hpp>
#include <math.h>
#include <random>

#ifndef __PERSON_H__
#define __PERSON_H__
class Person {

        private:
                int x, y;
                bool hasDisease;
                float strength;
                float reproVal;
                sf::Color color;
                sf::VertexArray points;

                int vectPos; //Keeps track of position of person in colony vector so removal is O(1)
        public:
                Person(int posX, int posY, bool disease, float str, sf::Color col);

                int getX();
                int getY();
                bool getDisease();
                float getStrength();
                float getReproVal();
                int getVectPos();

                //Setters
                void setDisease();
                void setX(int dx);
                void setY(int dy);
                void setColor(sf::Color nColor);
                void setVectPos(int vPos);

                void move(sf::Sprite& map, std::uniform_int_distribution<int>& distrib, std::default_random_engine& generator);
};
#endif

最后，我的Person.cpp构造函数看起来像：

#include <SFML/Graphics.hpp>
#include <math.h>
#include <random>
#include "Person.h"

inline Person::Person(int posX, int posY, bool disease, float str, sf::Color col){
        x = posX;
        y = posY;

        hasDisease = disease;
        strength = str;
        reproVal = 0;
        color = col;
        points = sf::VertexArray(sf::Points, 1);
}

我尝试做 Person::Person p(0, 0, fale, 5.0f, sf::Color::Green);

但这导致了相同的错误。

我对C ++还是很陌生，我想我不太了解使对象以这种语言工作的方式。