Segmentation Fault 11

[ceren]

Hello everyone,

I have a simple c++ code where i define a dynamic array as:

std::vector<double>IPWeights;

and the pass it to a function called reference with a reference (so i changed its content) like:

void reference (std::vector<double> &IPWeights)

and then in my main function, after i changed my arrays content I wanted to print it like:

[code]    [code]    int size_weights=IPWeights.size();
    
    for (int i=0; i<size_weights; i++)
    {
    
        std::cout<<IPWeights[i]<<std::endl;

    }[

/code][/code]

but in the screen i only see "segmentation fault 11".

Anyone knows why that is??

Thanks in advance.

[mutexe]

i dont see anything wrong with something like this:

for (int i=0; i<IPWeights.size(); i++)
    {
    
        std::cout<<IPWeights[i]<<std::endl;

    }

You dont call your reference method between line 1 and 3 do you?

[ceren]

Hi, thanks for your reply. As an answer of you question,no I don't ,the main file looks like:

int main ()
{
  std::vector<double>IPWeights;
  reference(IPWeights);

  int size_weights=IPWeights.size();

    for (int i=0; i<size_weights; i++)
    {
        std::cout<<IPWeights[i]<<std::endl;
    }
}

I am compiling and running this through terminal window with following command:

g++ -Wall main.cpp reference.cpp -o print

do you think is there a problem with this command?

[mutexe]

do you think is there a problem with this command?

Nope :)

stick a breakpoint on line 8 and have a look inside your vector. How many elements has it? and what is the value of size_weights?

also just before your line 10 (i.e inside your for loop) you could print out 'i' too.

[coder777]

I'd think that the function reference(...) is the culprit.

[ceren]

Guys, thanks for all the commands, but I figured out the problem was assigning IPWeights inside the reference function by index.

When I used IPWeights.push_back(...) rather than IPWeights [0]=... it got solved.