Parsing Data in C++

**ss3x** · 03-28-2002

hola amigos. this is my goal, i'm reading a file into my program, each line resembles this (its for a graph project)

SOUCE : VertexA 1 VertexB 13 VertexC 8

where souce is the source vertex and the vertecies after the colon are adjacent vertecies. i am using getline to pull in each line of my input file. then i redirect each 'thing' into a string and the costs into an integer.. fine so long as i don't have more than one vertex after the source, how do i loop to run through til the end of the getline and then pull another line up after that?

code reads as this so far

Code:

while( getline(in, oneLine) )
{

string source, colon, dest;
int cost;

in >> source;
in >> colon;//colon fall through
//HERE I Want to run my loop til oneLine is gone, but how??
while(oneLine){//THIS CAUSES ERRORS in G++
in>>dest;
in>>cost;
}//closes while one line

}//closes getline while loop

this is obviously only to parse the input file and nothign more.. so any/all advice is appreciated.

**Sorensen** · 03-29-2002

You could do something like -

Code:

#include <iostream>
#include <sstream>
#include <string>
using namespace std;

class vertices
{
private:
	class vertex
	{
	private:
		string name;
		int val;
		
		friend istream& operator >>(istream& is, vertex& ve)
		{
			return is >> ve.name >> ve.val;
		}

		friend ostream& operator <<(ostream& os, const vertex& ve)
		{
			return os << ve.name << ' ' << ve.val;
		}
		

	};

	vertex source;
	vertex adj[2];

	friend istream& operator >>(istream& is,vertices& ve)
	{
		string line;
		getline(is,line);
		stringstream ss;
		ss << line;
		string discard;
		ss >> discard >> discard >> ve.source >> ve.adj[0] >> ve.adj[1];
		return is;
	}

	friend ostream& operator <<(ostream& os, const vertices& ve)
	{
		return os << ve.source << ' ' << ve.adj[0] << ' ' << ve.adj[1];
	}

};


int main()
{

	vertices v;
	cin >> v;
	cout << v << '\n';	

	return 0;
}

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