CODEWITHSUNDEEP
c++functionheader-files
Nicklandreth
Nicklandreth

Reputation: 45

Can't reference functions in .cpp, and .h file from main. C++

I am trying to seperate references, functions, and a main function into a .h and 2 .cpp files for the first time and cannot get the functions referenced in my object.h file and defined in my object.cpp file to work in my main.cpp.

I am using codeblocks to create a project, Creating a console application, creating a class within that project including .h and .cpp files made within the same folder. I then copy #include and namespace into my cpp file below #include "object.h". I then define a simple function to cout a string in .cpp copy paste the reference into .h . Then I go back to main and create an object for the function. then I call the function with the newly created object. It is at this point that my code will no longer compile.

// This is main.cpp

#include "object.h"
#include <iostream>

using namespace std;

int main()
{
  object thing;

  thing.printObject();
  return 0;
}

// This is object.cpp

#include "object.h"
#include <iostream>

using namespace std;

  void printObject(){

  cout << "You rock!" << endl;

}

// This is object.h

#ifndef OBJECT_H
#define OBJECT_H

class object
{
public:
  void printObject();
};

#endif

And this is the output I get during build:

obj\Debug\main.o||In function `main':|
D:\c ++\Object test\main.cpp|11|undefined reference to 
`object::printObject()'|
||error: ld returned 1 exit status|
||=== Build failed: 2 error(s), 0 warning(s) (0 minute(s), 0 second(s)) 
===|

I expected my console would print "You rock!".

Upvotes: 1

Views: 2583

Answers (1)

Gerriet
Gerriet

Reputation: 1350

In the cpp-file you should have

void object::printObject() {

otherwise you define a global function, not a method of object.

Upvotes: 2

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