请问有人能帮我解决在使用gnuWin32时代码中运行时出现的错误吗?当注释掉GaussSeidel函数时,该错误消失了。我尝试过在线GNU GCC v4.8.3编译器,它似乎能正常运行。但在ideone.com上使用C++14则出现了double free or corruption的运行时错误。我附上了一个简化版本的代码,其中包含该错误。谢谢。
#include <iostream>
#include <cmath>
void GaussSeidel(double** const aa, double* const bb, double* xvec, const int nn, int mm)
{
int i = 0, j = 0;
double *ynew=NULL, *yold=NULL, EE=20.0;
ynew=new double[nn];
yold=new double[nn];
while (mm > 0 && EE>0.00001) {
EE=0.0;
for (i = 0; i < nn; i++) {
yold[i]=ynew[i];
ynew[i] = bb[i] / aa[i][i];
for (j = 0; j < nn; j++) {
if (j == i) continue;
ynew[i] = ynew[i] - (aa[i][j] * xvec[j]/ aa[i][i]);
xvec[i] = ynew[i];
}
if (std::abs(ynew[i]-yold[i])>EE) EE=std::abs(ynew[i]-yold[i]);
}
mm--;
}
std::cout << mm << " " << EE << std::endl;
for (j = 0; j < nn; j++)
xvec[i] = ynew[i];
delete [] ynew;
delete [] yold;
}
int main (void)
{
int i, j;
const int Np=100;
double **Infl=NULL, *Source=NULL, *FpdPhi0=NULL;
Source=new double[Np];
FpdPhi0=new double[Np];
Infl = new double *[Np]; for(i = 0; i < Np; i++) Infl[i] = new double[Np];
for (j=0; j<Np; j++){
for (i=0; i<Np; i++){
if (i==j){
Infl[j][i]=1.0;
}
else {
Infl[j][i]=0.0;
}
}
Source[j]=4.0;
FpdPhi0[j]=0.1;
}
GaussSeidel(Infl, Source, FpdPhi0, Np, 300);
for(i = 0; i < Np; i++) delete [] Infl[i];
delete [] Infl;
delete [] Source;
delete [] FpdPhi0;
return 0;
}
std::vector
并消除所有无意义的手动内存管理。 - Chadnew[]
调用抛出异常,则存在内存泄漏问题。通过使用std::vector
来避免所有这些问题。 - PaulMcKenziesizeof(std::vector<double>) - sizeof(double*)
。 - molbdnilo