how to pass a string as an argument?

for some reason c++ has a problem when i try to pass a string in as an argument to my method parseLine...

did i do it correctly ...thanks for any help.

parser.cpp---

Code:

#include <iostream>
#include <fstream>
#include <string.h>
#include "parser.h"

using namespace std;

/* constructor */
parser::parser(void){
}

/* reads in the specified file, line by line */
int parser::readFile(void) {

	string filename="data.txt";
	string line;
   
	ifstream file(filename.c_str());
   
	if(!file.is_open()) {

		cout << "Error...file is not opened" << endl;
        return 1;
	}	

	while (!file.eof()) {
		
		/* get line by line */
		getline(file, line);

		/* now parse the line */
		parseLine(line);		
	}

	file.close();

	return 0;
}

void parser::parseLine(string line) {
	
	cout << "Parsing line: << line << endl;
}

parser.h---

Code:

#include <iostream>
#include <string>

class parser {
	
public:
	parser(void);
	int readFile(void);
	void parseLine(string line);
};

>for some reason c++ has a problem when i try to pass a string in as an argument to my method
I gave away my crystal ball a long time ago. You'll need to be more specific about what "problem" C++ has.

Originally Posted by waxydock

for some reason c++ has a problem when i try to pass a string in as an argument to my method parseLine...

did i do it correctly ...thanks for any help.

Put this in your parser.h:

Code:

using std::string;

(You also missed a quote mark in the cpp file, but you probably already knew that.)

Code:

	cout << "Parsing line: "<< line << endl;

Regards,

Dave

Code:

void parser::parseLine(string line) {
	
	cout << "Parsing line:" << line << endl;
}

You should pass a pointer rather then the class instance itself.

Code:

void parser::parseLine(string *line) {
cout << "Parsing line:" << *line << endl;

And to call the function

Code:

parseLine(&line);