function declaration usage in multiple files?

[strongdrink]

Hello everyone.

I am having issues with using a function within two c files that is declared in a header file.

Here is basically what I am trying to do.

main.h

#pragma once
void foo();

another.h

#pragma once
void bar();

main.cpp

#include "main.h"
#include "another.h"

int main() {
  bar();
}

another.cpp

#include "main.h"
#include "another.h"

void bar() {
  foo();
}

undefined reference to: bar() in another.h line blah

Would I have to use some form of extern or something?

Thanks for any help

- strongdrink

[AbstractionAnon]

Would I have to use some form of extern or something?

No. What you have is perfectly fine.

[Moschops]

The function bar calls the function foo. The function foo does not exist. The linker cannot find it because it does not exist. Otherwise, this compiles and links fine.

[strongdrink]

Here is my exact error:

/home/elijah/code/chip/src/block/blocks/player.cpp:46:
undefined reference to `void push_back_bytes<unsigned short>(std::deque<unsigned char, std::allocator<unsigned char> >*, unsigned short)'

Player is a class.
push_back_bytes is declared in main.h.
main.h is inluded in the top of player.cpp
push_back_bytes is called by one of the methods of the Player class.

EDIT:

Aha! according to this post http://v2.cplusplus.com/forum/windows/72494/ -- I can't have a template split among several files.