Main 中 return 语句的堆损坏
Heap corruption on return statement in Main
我正在创建一个包含多项式的动态数组 class。我现在遇到的问题是,当我 运行 我的代码时,一旦它遇到 main 中的 return 语句,它就会开始调用析构函数并开始从以 C 开头的每个实例中释放内存。它删除 C 很好,但是当它到达 B 时,我得到一个堆损坏错误。我试过遍历代码,但看不到损坏发生的位置。谁能帮我?它给我的确切错误是 "CRT detected that the application wrote to memory after end of heap buffer."
*编辑:我很高兴得到人们的建议以帮助改进我的代码,但请记住这是针对 class 并且有特定规则的。我不能使用 STL 中的任何东西。我喜欢你能给我的任何批评。
//////////////////////////Header////////////////// ///////////
class Poly
{
friend std::ostream& operator<<(std::ostream& output, const Poly& pNomial);
public:
Poly();
Poly(const int& coeff, const int& degree = 0);
Poly(const Poly& copy);
~Poly();
void setCoeff(const int& coeff, const int& degree);
bool isEmpty()const;
Poly& operator=(const Poly& pNomial);
private:
int* coeffs;
int highestDegree;
};
/////////////////////////CPP///////////////// ///////
#include "poly.h"
Poly::Poly()
{
highestDegree = 0;
coeffs = new int[highestDegree+1]();
}
Poly::Poly(const int & coeff, const int & degree)
{
if (degree >= 0)
{
highestDegree = degree;
coeffs = new int[highestDegree + 1]();
coeffs[degree] = coeff;
}
else
{
highestDegree = 0;
coeffs = new int[highestDegree + 1]();
}
}
Poly::Poly(const Poly& copy)
{
highestDegree = copy.highestDegree;
coeffs = new int[highestDegree + 1]();
for (int i = 0; i < copy.highestDegree + 1; i++)
{
coeffs[i] = copy.coeffs[i];
}
}
Poly::~Poly()
{
delete[] coeffs;
}
void Poly::setCoeff(const int& coeff, const int& degree)
{
if (degree > this->highestDegree)
{
Poly temp = *this;
delete[] this->coeffs;
this->highestDegree = degree;
this->coeffs = new int[highestDegree]();
for (int i = 0; i < temp.highestDegree + 1; i++)
{
this->coeffs[i] = temp.coeffs[i];
}
}
if (degree >= 0)
{
this->coeffs[degree] = coeff;
}
}
bool Poly::isEmpty()const
{
bool check = true;
for (int i = 0; i < highestDegree + 1 && check; i++)
{
if (coeffs[i] != 0)
{
check = false;
}
}
return check;
}
Poly & Poly::operator=(const Poly& pNomial)
{
if (this != &pNomial)
{
delete[] this->coeffs;
this->highestDegree = pNomial.highestDegree;
this->coeffs = new int[this->highestDegree + 1]();
for (int i = 0; i < pNomial.highestDegree + 1; i++)
{
this->coeffs[i] = pNomial.coeffs[i];
}
}
return *this;
}
std::ostream& operator<<(std::ostream& output, const Poly& poly)
{
if (!poly.isEmpty())
{
for (int i = poly.highestDegree; i >= 0; i--)
{
if (i == 1 && poly.coeffs[i] != 0)
{
if (poly.coeffs[i] >= 1)
{
output << " +" << poly.coeffs[i] << "x";
}
else
{
output << " " << poly.coeffs[i] << "x";
}
}
else if (i == 0 && poly.coeffs[i] != 0)
{
if (poly.coeffs[i] >= 1)
{
output << " +" << poly.coeffs[i];
}
else
{
output << " " << poly.coeffs[i];
}
}
else if (poly.coeffs[i] != 0)
{
if (poly.coeffs[i] >= 1)
{
output << " +" << poly.coeffs[i] << "x^" << i;
}
else
{
output << " " << poly.coeffs[i] << "x^" << i;
}
}
}
}
else
{
output << " 0";
}
return output;
}``
//////////////////////////////主要/////////// //////////////
#include "poly.h"
#include <iostream>
int main()
{
Poly A, B(5, 7), C(2);
B.setCoeff(2, 10);
B.setCoeff(1, 3);
B.setCoeff(5, 4);
std::cout << A << std::endl;
std::cout << B << std::endl;
std::cout << C << std::endl;
return 0;
}
我必须说,我同意评论,您应该认真研究您在 Poly
class 中使用的资源的适当生命周期管理。
要回答您现在面临的问题,请查看 setCoeff()
函数。
this->coeffs = new int[highestDegree]();
应该改为,
this->coeffs = new int[highestDegree + 1]();
对于当前的实现,您使用 highestDegree
分配数组,并在 for
循环中访问 temp.coeffs[highestDegree]
,这是越界访问,即循环直到 i < temp.highestDegree + 1
.
我正在创建一个包含多项式的动态数组 class。我现在遇到的问题是,当我 运行 我的代码时,一旦它遇到 main 中的 return 语句,它就会开始调用析构函数并开始从以 C 开头的每个实例中释放内存。它删除 C 很好,但是当它到达 B 时,我得到一个堆损坏错误。我试过遍历代码,但看不到损坏发生的位置。谁能帮我?它给我的确切错误是 "CRT detected that the application wrote to memory after end of heap buffer."
*编辑:我很高兴得到人们的建议以帮助改进我的代码,但请记住这是针对 class 并且有特定规则的。我不能使用 STL 中的任何东西。我喜欢你能给我的任何批评。
//////////////////////////Header////////////////// ///////////
class Poly
{
friend std::ostream& operator<<(std::ostream& output, const Poly& pNomial);
public:
Poly();
Poly(const int& coeff, const int& degree = 0);
Poly(const Poly& copy);
~Poly();
void setCoeff(const int& coeff, const int& degree);
bool isEmpty()const;
Poly& operator=(const Poly& pNomial);
private:
int* coeffs;
int highestDegree;
};
/////////////////////////CPP///////////////// ///////
#include "poly.h"
Poly::Poly()
{
highestDegree = 0;
coeffs = new int[highestDegree+1]();
}
Poly::Poly(const int & coeff, const int & degree)
{
if (degree >= 0)
{
highestDegree = degree;
coeffs = new int[highestDegree + 1]();
coeffs[degree] = coeff;
}
else
{
highestDegree = 0;
coeffs = new int[highestDegree + 1]();
}
}
Poly::Poly(const Poly& copy)
{
highestDegree = copy.highestDegree;
coeffs = new int[highestDegree + 1]();
for (int i = 0; i < copy.highestDegree + 1; i++)
{
coeffs[i] = copy.coeffs[i];
}
}
Poly::~Poly()
{
delete[] coeffs;
}
void Poly::setCoeff(const int& coeff, const int& degree)
{
if (degree > this->highestDegree)
{
Poly temp = *this;
delete[] this->coeffs;
this->highestDegree = degree;
this->coeffs = new int[highestDegree]();
for (int i = 0; i < temp.highestDegree + 1; i++)
{
this->coeffs[i] = temp.coeffs[i];
}
}
if (degree >= 0)
{
this->coeffs[degree] = coeff;
}
}
bool Poly::isEmpty()const
{
bool check = true;
for (int i = 0; i < highestDegree + 1 && check; i++)
{
if (coeffs[i] != 0)
{
check = false;
}
}
return check;
}
Poly & Poly::operator=(const Poly& pNomial)
{
if (this != &pNomial)
{
delete[] this->coeffs;
this->highestDegree = pNomial.highestDegree;
this->coeffs = new int[this->highestDegree + 1]();
for (int i = 0; i < pNomial.highestDegree + 1; i++)
{
this->coeffs[i] = pNomial.coeffs[i];
}
}
return *this;
}
std::ostream& operator<<(std::ostream& output, const Poly& poly)
{
if (!poly.isEmpty())
{
for (int i = poly.highestDegree; i >= 0; i--)
{
if (i == 1 && poly.coeffs[i] != 0)
{
if (poly.coeffs[i] >= 1)
{
output << " +" << poly.coeffs[i] << "x";
}
else
{
output << " " << poly.coeffs[i] << "x";
}
}
else if (i == 0 && poly.coeffs[i] != 0)
{
if (poly.coeffs[i] >= 1)
{
output << " +" << poly.coeffs[i];
}
else
{
output << " " << poly.coeffs[i];
}
}
else if (poly.coeffs[i] != 0)
{
if (poly.coeffs[i] >= 1)
{
output << " +" << poly.coeffs[i] << "x^" << i;
}
else
{
output << " " << poly.coeffs[i] << "x^" << i;
}
}
}
}
else
{
output << " 0";
}
return output;
}``
//////////////////////////////主要/////////// //////////////
#include "poly.h"
#include <iostream>
int main()
{
Poly A, B(5, 7), C(2);
B.setCoeff(2, 10);
B.setCoeff(1, 3);
B.setCoeff(5, 4);
std::cout << A << std::endl;
std::cout << B << std::endl;
std::cout << C << std::endl;
return 0;
}
我必须说,我同意评论,您应该认真研究您在 Poly
class 中使用的资源的适当生命周期管理。
要回答您现在面临的问题,请查看 setCoeff()
函数。
this->coeffs = new int[highestDegree]();
应该改为,
this->coeffs = new int[highestDegree + 1]();
对于当前的实现,您使用 highestDegree
分配数组,并在 for
循环中访问 temp.coeffs[highestDegree]
,这是越界访问,即循环直到 i < temp.highestDegree + 1
.