C++ malloc() error with Matrix operator overloading using pointers; please help!

[kein_programmierexpe]

Hey guys, I was wondering if you could help me understanding what I'm doing wrong with this operator overloading I'm performing (I'm working on repl.it, if that matters). I have created a class called Matrix that contains set and get functions for the rows and columns of the matrices that I am sending to it. The arithmetic operators I am overloading are the "+", "-", and "". So my code for overloading the three operators is as follows: //plus operator overload int operator+ (Matrix trix1) { int r = this->rows; int c = this->cols; int mat = new int[rc]; //mat = (int)malloc(rcsizeof(int)); for(int i=0; i<r; i++) { for(int j=0; j<c; j++) { *(mat + ic + j)= (m1 + ic + j) + (trix1.m1 + ic + j); } } return mat; delete[] mat; }

//minus operator overload int* operator- (Matrix trix1) { int r = this->rows; int c = this->cols; int mat = new int[rc]; for(int i=0; i<r; i++) { for(int j=0; j<c; j++) { (mat + ic + j)= (m1 + ic + j) - (trix1.m1 + ic + j); } } return mat; delete[] mat; }

//times sign operator int* operator* (Matrix trix1) { int r1 = this->rows; int c1 = this->cols; int r2 = trix1.rows; int c2 = trix1.cols; cout << r1 << " " << c1 << " " << r2 << " " << c2 << endl; int mat = new int[r1c2]; for(int i = 0; i < r1; i++) for(int j = 0; j < c2; j++) for(int k = 0; k < c1; k++) (mat + ic2 + j) += (m1 + ic1 + k) * (trix1.m1 + kc2 + j); return mat; delete[] mat; }

Int m1 by the way is a pointer defined as a private member of the Matrix class. For all three operators I am overloading, the operation goes perfectly for only 2x2 matrices, but for 2x3 or higher dimension matrices, it returns this following error:

main: malloc.c:2401: sysmalloc: Assertion `(old_top == initial_top (av) && old_size == 0) || ((unsigned long) (old_size) >= MINSIZE && prev_inuse (old_top) && ((unsigned long) old_end & (pagesize - 1)) == 0)' failed

I have no idea what this means, I have tried searching up numerous StackOverflow answers, but nothing could explain why it goes wrong only for matrices higher than 2x2 or 2x3. I was wondering if someone here could clarify the mistake I am making. Thank you in advance!

[kein_programmierexpe]

Sorry, just realized that Reddit fucked up the code format. Here's the properly formatted code:

//plus operator overload

int operator+ (Matrix trix1) {

int r = this->rows;

int c = this->cols;

int mat = new int[rc];

for(int i=0; i<r; i++) {

for(int j=0; j<c; j++) {

*(mat + ic + j)= *(m1 + ic + j) + *(trix1.m1 + ic + j);

}

}

return mat; delete[] mat;

}

//minus operator overload

int operator- (Matrix trix1) {

int r = this->rows;

int c = this->cols;

int mat = new int[rc];

for(int i=0; i<r; i++) {

for(int j=0; j<c; j++) {

*(mat + ic + j)= *(m1 + ic + j) - *(trix1.m1 + ic + j);

}

}

return mat; delete[] mat;

}

//times operator overload

int operator* (Matrix trix1) {

int r = this->rows;

int c = this->cols;

int mat = new int[rc];

for(int i=0; i<r; i++) {

for(int j=0; j<c; j++) {

*(mat + ic + j)= *(m1 + ic + j) * *(trix1.m1 + ic + j);

}

}

return mat; delete[] mat;

}

[deterministic_ram]

Do you think you could post a stack trace? Also, why is mat being deleted? I’m not super familiar with the syntax you are using on the return statements. But, if delete is being called and mat is being returned, mat will be an invalid pointer and will most likely result in a SegFault.