How to link a common module in more packages?

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Hello,

I have some ROS C++ packages that share many common functions.

They are identical functions so I was thinking to put them all in another file.hpp and include this file in each package is needing them.

I'm using catkin to create my workspace and all the packages I develop. They are all in src directory starting from the main one, as the tutorials said.

But where do I must save this file.hpp in the workspace and which path I have to #include in each file that is using it? Do I have to modify the CMakeLists.txt?

This is a scheme of my workspace:

• build
• devel

• src

  package 1

  CMakeLists.txt

  src (file.cpp are here)

  include

  package1.xml

  package 2

  ...

Thanks in advance.