C++：运算符重载，运算符+

#include<iostream> 
#include"polynom.h" 
using namespace std; 

// operator= works !!! 

int main() 
{ 
    Polynomial p(5), q(5), r(5); 
    cout<<"1"<<endl; 
    cin>>x; 

    p[0] = 1; 
    p[1] = 2; 
    p[2] = 3; 

    q[0] = 4; 
    q[1] = 5; 
    q[2] = 6; 

    cout<<p+q; 
    return 0; 
} 


Polynomial::Polynomial(const Polynomial &copyConstructor) : size(copyConstructor.size) 
{ 
    coeffs = new double(size); 

    int i=0; 
    while(i<size) 
    { 
     coeffs[i] = copyConstructor.coeffs[i]; 
     i++; 
    } 
} 


Polynomial::Polynomial(int s) 
{ 
    size = s; 
    coeffs = new double [s]; 

    // Setting all coefficients in the polynomial equal to 0 
    for(int i=0; i<size; i++) 
     coeffs[i]=0; 
} 



Polynomial Polynomial::operator+ (const Polynomial &rightPoly) const 
{ 

    int BigSize, SmallSize; 
    Polynomial *newPoly = NULL; 

    cout<<"in the operator\n"; 

    if(size == rightPoly.size) 
    { 
     cout<<"first if\n"; 
     newPoly = new Polynomial(size); 

     cout<<"first if resize\n"; 
     for(int i=0; i<newPoly->size; i++) 
      cout<<newPoly->coeffs[i]<<endl; 
     cout<<"size = "<<size<<endl; 
     cout<<"rightPoly.size = "<<rightPoly.size<<endl; 
     cout<<"newPoly->size = "<<newPoly->size<<endl; 

     cout<<"first if loop\n"; 
     for(int i=0; i<size; i++) 
     { 
      cout<<"i= "<<i; 
      newPoly->coeffs[i] = rightPoly.coeffs[i]+coeffs[i]; 
      cout<<" newPoly[]"<<newPoly->coeffs[i]<<endl; 
     } 
     cout<<"out of loop\n"<<endl; 
    } 


    else if(size > rightPoly.size) 
    { 
     cout<<"second if\n"; 
     BigSize = size; 
     SmallSize = rightPoly.size; 

     newPoly = new Polynomial(BigSize); 

     cout<<"second if loop\n"; 
     for(int i=0; i<SmallSize; i++) 
      newPoly->coeffs[i] = rightPoly.coeffs[i] + coeffs[i]; 
     for(int i=SmallSize; i<BigSize; i++) 
      newPoly->coeffs[i] = coeffs[i]; 
     cout<<"second if loop end\n"; 
    } 

    else 
    { 
     cout<<"third if\n"; 
     BigSize = rightPoly.size; 
     SmallSize = size; 

     newPoly = new Polynomial(BigSize); 

     for(int i=0; i<SmallSize; i++) 
      newPoly->coeffs[i] = coeffs[i] + rightPoly.coeffs[i]; 
     for(int i=SmallSize; i<BigSize; i++) 
      newPoly->coeffs[i] = rightPoly.coeffs[i]; 
    } 

    cout<<"before return\n"; 
    return *newPoly;  
}

问题：当Visual Studio 2010执行p + q行时，会出现以下错误。 p和q具有相同的大小，并且它们被正确初始化（我检查了它们）。C++：运算符重载，运算符+

Windows has triggered a breakpoint in CNG242.exe. 
This may be due to a corruption of the heap, which indicates a bug in CNG242.exe or any of the DLLs it has loaded. 
This may also be due to the user pressing F12 while CNG242.exe has focus. 
The output window may have more diagnostic information.

我添加了评论为了跟随线条并找出问题所在。我没有得到导致错误的原因？

来源

2012-05-11 Encinaar

我没有看到'p + q'行。 –

你的类是否有适当的拷贝构造函数？ –

确保您遵循三项规则。 –

您溢出堆块

coeffs = new double(size); // You allocated memory for only one double variable

这种方式。

来源

2012-05-11 09:09:38 BlueWanderer

表达

coeffs = new double(size);

为一个double变量分配空间，初始化其值size，并返回指针coeffs。你可能想要的是：

coeffs = new double[size];

注意方括号。这将为size双精度初始化空间，并不会将它们初始化为任何特定值，并将指向第一个的指针返回至coeffs。

来源

2012-05-11 09:11:42

C++：运算符重载，运算符+

回答

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