How to iterate over a vector containing many stucts (C++) - c++

Question

// In my Class A, I have many nodes and every node data is stored in a struct like this:
Class A
{
private:
struct BriteNodeInfo
{
int nodeId;
double xCoordinate;
double yCoordinate;
int inDegree;
int outDegree;
int asId;
std::string type;
};
};
// Each node instance is stored in a vector like this:
typedef std::vector<BriteNodeInfo> BriteNodeInfoList;
BriteNodeInfoList m_briteNodeInfoList;
//And then, here is the function that I want to implent down below
void SaveNodeData (std::string fname);
};
Problem: How do I implent that SaveNodeData() function to save my nodes data in .txt file like this?:
nodeId0 yCoordinate0 xCoordinate0
nodeId1 yCoordinate1 xCoordinate1
nodeId2 yCoordinate2 xCoordinate2
nodeId3 yCoordinate3 xCoordinate3
etc...
I have tried but my iteration syntax is not good enough. Here is my function, please help:
Here is my failed function:
void SaveNodeData (std::string fname)
{
ofstream os(fname.c_str(), ios::trunc);
vector<BriteNodeInfo> BriteNodeInfoList;
BriteNodeInfoList m_briteNodeInfoList;
for (BriteNodeInfoList::Iterator i = m_briteNodeInfoList.Begin(); i != m_briteNodeInfoList.End(); ++i)
{
os << BriteNodeInfo[i].nodeId "\t" << "\t" << BriteNodeInfo[i].yCoordinate; << "\t"BriteNodeInfo[i].xCoordinate<< "\n";
}
os << "\n";
}

Answer 1

Before starting, this code as written will clearly have some compile errors. But assuming you can manage to fix those issues, there's one huge flaw.
Your function SaveNodeData creates an empty BriteNodeInfoList, and then tries to read from it. The for loop you have written will always simply exit.
What you need to do is create and populate a BriteNodeInfoList somewhere that this function reads. You could pass it in as an argument to the function, have it as a private variable for class A (assuming SaveNodeData is made into a member of class A). Or you could make it a static member variable of class A (not really recommended: static member variables of objects have some serious problems).

Answer 2

void SaveNodeData (std::string fname) // file path
{
ofstream os(fname.c_str(), ios::trunc);
vector<BriteNodeInfo> BriteNodeInfoList = m_briteNodeInfoList;
for (std::vector<BriteNodeInfoList>::Iterator it = BriteNodeInfoList.Begin(); it != BriteNodeInfoList.End(); ++it)
{
os << (*it).nodeId << "\t" << (*it).yCoordinate << "\t" << (*it).xCoordinate << "\n";
}
}