对构造函数和析构函数的未定义引用

undefined reference to constructors and destructors

本文关键字:未定义 引用 析构函数 构造函数      更新时间:2023-10-16

我只看到过这是由于人们在构建时没有将他们的类对象链接在一起造成的,但我看到过,我不确定是怎么回事。

来源:

//test.cpp
#include "Point.h"
#include "Sphere.h"
#include "Scene.h"

int main(){
    Sphere s;
    Scene sc;
    sc.img_plane.upper_left = Point(-1, 1, -3);
    sc.img_plane.upper_right = Point(1, 1, -3);
    sc.img_plane.lower_left = Point(-1, -1, -3);
    sc.img_plane.lower_right = Point(1, -1, -3);
    sc.width = 100;
    sc.height = 100;
    return 0;
}

错误:

test.cpp:(.text+0x17): undefined reference to `Sphere::Sphere()'
test.cpp:(.text+0x26): undefined reference to `Scene::Scene()'
test.cpp:(.text+0x192): undefined reference to `Scene::~Scene()'
test.cpp:(.text+0x1a1): undefined reference to `Sphere::~Sphere()'
test.cpp:(.text+0x1bf): undefined reference to `Scene::~Scene()'
test.cpp:(.text+0x1d3): undefined reference to `Sphere::~Sphere()'

Makefile:

CC = g++
SRC = ./src
BUILD = ./build
main : main.o Point.o colort.o Sphere.o Scene.o Ray.o HitRecord.o
    $(CC) $(BUILD)/main.o $(BUILD)/Point.o -o $(BUILD)/main
main.o : $(SRC)/test.cpp
    $(CC) -c $< -o $(BUILD)/main.o
Point.o : $(SRC)/Point.cpp $(SRC)/Point.h
    $(CC) -c $< -o $(BUILD)/Point.o
colort.o : $(SRC)/colort.cpp $(SRC)/colort.h
    $(CC) -c $< -o $(BUILD)/colort.o
Sphere.o : $(SRC)/Sphere.cpp $(SRC)/Sphere.h $(SRC)/colort.cpp $(SRC)/Point.cpp
    $(CC) -c $< -o $(BUILD)/Sphere.o
ImagePlane.o : $(SRC)/ImagePlane.cpp $(SRC)/ImagePlane.h
    $(CC) -c $< -o $(BUILD)/ImagePlane.o
Scene.o : $(SRC)/Scene.cpp $(SRC)/Scene.h
    $(CC) -c $< -o $(BUILD)/Scene.o 
Ray.o : $(SRC)/Ray.cpp $(SRC)/Ray.h
    $(CC) -c $< -o $(BUILD)/Ray.o
HitRecord.o : $(SRC)/HitRecord.cpp $(SRC)/HitRecord.h
    $(CC) -c $< -o $(BUILD)/HitRecord.o     
clean :
    rm $(BUILD)/*
test : main 
    $(BUILD)/main

场景构造函数与Sphere:相同

Sphere.h:

#ifndef SPHERE_H_
#define SPHERE_H_
#include "colort.h"
#include "Point.h"
#include "Ray.h"
class Sphere {
public:
    Sphere();
    virtual ~Sphere();
    Point center;
    double radius;
    color_t diffuse, specular;
    double intersection(Ray r);
};
#endif /* SPHERE_H_ */

Sphere.cpp:

#include "Sphere.h"
#include <math.h>
Sphere::Sphere() {
}
Sphere::~Sphere() {
}
...other class functions

在您的main规则中:

main : main.o Point.o colort.o Sphere.o Scene.o Ray.o HitRecord.o
    $(CC) $(BUILD)/main.o $(BUILD)/Point.o -o $(BUILD)/main

注意,尽管您提到Sphere.o是一个依赖项,但您并没有链接。您还需要将其包含在构建行中:

main : main.o Point.o colort.o Sphere.o Scene.o Ray.o HitRecord.o
    $(CC) $(BUILD)/main.o $(BUILD)/Point.o $(BUILD)/Sphere.o -o $(BUILD)/main

您可能还想添加其他的,因为您将它们列为依赖项。