Undefined reference to function

[Blacktides1337]

Hey all,

I'm sure this is a super simple question but I just can't seem to find the right answer for me. The situation is this, I have a function call, that is supposed to call a function from a declared header file. That header file, looks to a .cpp file for the function. Now, every time I try to run I get "undefined reference to 'histogram(*various arguments*). The code follows, if someone can point out where I've gone wrong it would be a great help. Also, I've tinkered around and I want to say that it doesn't even recognize the header file, I've commented it out and still get the same errors when trying to run.

main.cpp
------------------------------------------------------------------------------

#include <cstdlib>
#include <iostream>
#include <string>
#include <fstream>
#include "histogram.h"

using namespace std;

void histogram(const int MaxPages, istream& input, ostream& output);

int main (int argc, char** argv)
{
...

histogram (MaxPages, in, out);
...
}


histogram.h
--------------------------------------------------------------------------
#ifndef HISTOGRAM_H
#define HISTOGRAM_H

#include <iostream>

void histogram(const int MaxPages, std::istream& input, std::ostream& output);

#endif


histogram.cpp
---------------------------------------------------------------------------
#include "histogram.h"
#include "arrayUtils.h"
#include <string>

using namespace std;

void histogram(const int MaxPages, istream& input, ostream& output)
{
...various code blurds
}


END

[shredded]

hi,

I might be wrong but the undefined reference could mean that your histogram.cpp file
is either not been compiled and/or linked into your program.

Not knowing how you compile its hard to say.

Hope this was helpful
Shredded

[firix]

Could you share with us the entire code?

[Return 0]

I'm confused... why do you have your function prototype in both main.cpp and histogram.h?
void histogram(const int MaxPages, istream& input, ostream& output);