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c++ - 这个析构函数发生了什么? (段错误)

转载 作者:行者123 更新时间:2023-11-28 05:17:39 25 4
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<分区>

我正在编写一个旨在模拟珊瑚生长的程序,我希望珊瑚成为某种二叉树。分支相当于节点。当我运行程序时出现“段错误”错误,经过测试和研究后我认为这是因为 Coral 类的析构函数试图删除 NULL 对象。但是我不知道如何解决它,因为我不完全理解析构函数是如何工作的,而且我对类的概念一点也不熟悉。

我给你声明 CoralBranch 和 Coral 类的头文件,实现这些类的 .cpp 和 main.cpp。

提前谢谢大家。

在重现我的问题的最小、完整且可验证的示例中工作,我没有遇到任何问题。我认为我的程序中还有其他错误,这些错误会在不应该有问题的方法中引发段错误。

coral2.h

#ifndef __CORAL2_H_INCLUDED__
#define __CORAL2_H_INCLUDED__

class CoralBranch{

public:

CoralBranch(); // class constructor 1
CoralBranch(double xpos, double zpos, double th); // class constructor 2
~CoralBranch();

CoralBranch *left; // pointer to left child
CoralBranch *right; // pointer to right child
double x; // x-position of the beggining of the branch
double z; // z-position of the beggining of the branch
double theta; // branch's direction: angle between the branch and z-axis
double length; // branch's length
int state; // state==1: branch is able to grow, state==0: branch can't grow

};


class Coral{

public:

Coral(); // class constructor 1
Coral(double bl, double gr, double ir, double dt); // class constructor 2
~Coral(); // class destructor

// adds theta-oriented left son to coral-branch *leaf
void add_left(CoralBranch *leaf, double theta);
// adds theta-oriented right son to coral-branch *leaf
void add_right(CoralBranch *leaf, double theta);
// destroys coral-branch *branch and its decendents
void destroy_coral(CoralBranch *branch);
// tests if the growing branch influence zone penetrates testbranch influence zone
void distance_test(Coral crl, CoralBranch *growingbranch, CoralBranch *testbranch);
// tests if the growing branch is big enough to have children and adds them
void branching_test(Coral crl, CoralBranch *growingbranch, double thetaleft, double thetaright);
// applies grow mechanism to growing branch
void branch_grow(Coral crl, CoralBranch *growingbranch);
// simulates the growing process for the entire colony after one time step by
// applying "branch_grow" to the whole colony
void coral_grow(Coral crl, CoralBranch *growingbranch);

//private:

CoralBranch *trunk;

double branching_length;
double growth_rate;
double influence_radius;
double Deltat;


};

#endif

coral2.cpp(只有构造函数和析构函数)

CoralBranch::CoralBranch():left(NULL),right(NULL),x(0.0),z(0.0),theta(0.0),length(1.0),state(1)
{
// there isn't any methods in this class
}

CoralBranch::CoralBranch(double xpos, double zpos, double th):left(NULL),right(NULL),x(xpos),z(zpos),theta(th),length(1.0),state(1)
{

}

CoralBranch::~CoralBranch(){

delete left;
delete right;

}

Coral::Coral(){

trunk=new CoralBranch();

branching_length=1.0;
growth_rate=1.0;
influence_radius=1.0;
Deltat=1.0;

}

Coral::Coral(double bl, double gr, double ir, double dt){

trunk=new CoralBranch();
//trunk=NULL;

branching_length=bl;
growth_rate=gr;
influence_radius=ir;
Deltat=dt;

}

Coral::~Coral(){ // coral destruction

destroy_coral(trunk);

}

void Coral::destroy_coral(CoralBranch *branch){ // destroys branch *branch and its decendents

if(branch == NULL) return;

destroy_coral(branch->left);
destroy_coral(branch->right);
delete branch;

/*if(branch!=NULL){

destroy_coral(branch->left); // destruction advance
destroy_coral(branch->right);
delete branch; // currently considered branch is deleted if it exists

}*/
}

main.cpp

#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include "coral2.h"
#include <math.h>
using namespace std;

int main(){

/* Variable declaration, these variables need to be initialized in order to
construct the coral with the characteristics we desire */
double branchinglength, growthrate, influenceradius, deltat;
/* Declaration and initialization of the total simulation time */
double TotalTime=2;
/* Declaration and initialization of counters */
int i=0;
int j=0;
printf("%d\n",j);

/* Initialization of Coral class parameters*/
branchinglength=0.2;
growthrate=1.0;
influenceradius=0.1;
deltat=1.0;

/* Creation of the coral object*/
static Coral GrowingCoral(branchinglength, growthrate, influenceradius, deltat);

/* Starting growth process */
for(i=0; i<TotalTime; i=i+deltat){

j++;
printf("%d\n",j);

GrowingCoral.coral_grow(GrowingCoral, GrowingCoral.trunk);

}

printf("%f\n",GrowingCoral.branching_length);

return 0;
}

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