You might find the BrowseTracker plugin helpful. Search for "Browse Tracker" in the wiki.codeblocks.org index.

I'd like to add my vote to this one. The BrowseTracker is not good enough. Being able to go to a function declaration/implementation and going back is a very important feature for efficient code browsing. A keyboard shortcut would be nice as well (go forward/go back in browsing history)

Please read the comment on the forum: http://forums.codeblocks.org/index.php/topic,3297.0.html

another one asking for the feature: http://forums.codeblocks.org/index.php/topic,6176.0.html

I backup that one. It lacks the eclipse "back" and "forth" buttons. Much better than a plugin (sorry about comparing to Eclipse. I choosed code::blocks because the Eclipse projecs are opaque: I hate them and also because it's not that well adapted to C++)

Open declaration/implementation of an API/middleware method to check its params (because intellisense cannot be perfect with C++ & templates :)), and then go back to the current code.