问题
Just moved my program over from windows to linux and the same code that worked now gives me a segmentation fault when calling the operator<< function from main.
(overview) My programs is a Vector class that takes input and returns what the input is, but when reach << endl it crashes, if I remove endl from main() it does not crash?
..///main
VecXd<int> x;
cout << "Input vector a\n";
cin >> a;
cout << "Test A: "<< a << endl; //seg fault, ->
cout << "Test A: " << a; //works
//----- class VecXd\\ opertor<< def + operator>>
/******************************************************/
friend istream &operator>>(istream &input, VecXd& vec)
{
for(int i = -1; i <= vec.dimension - 1; i++)
{
if(i == -1)
{
input >> vec.dimension;//>> (V vecArr = new V[vec.dimension]);
cout << vec.dimension << " dimension check" << endl;
vec.vecArr = new V[vec.dimension];
//vec.dimension = vecArr[0];
//cout << vec.dimension << " dimension check" << endl;
}
else
{
input >> vec.vecArr[i];//>> (V vecArr = new V[vec.dimension]);
cout << vec.vecArr[i] << " value check" << endl;
}
}
}
friend ostream& operator<<(ostream& output, const VecXd& vec)
{
for(int i = 0; i < vec.dimension; i++)
{
output << vec.vecArr[i] << " ";
}
output << endl;
// output << endl;
}
/****************************************************/
why does endl lead to crash? doesn't end of array outputing endl solve this issue?
回答1:
You forget to return ostream& (and istream&).
Add -Wall flag to your compile command if you are using gcc/clang/icc
来源：https://stackoverflow.com/questions/18896294/operator-overloading-endl-leads-to-segmentation-fault