I\'m trying to complete the boost::signal tutorial at http://www.boost.org/doc/libs/1_47_0/doc/html/signals/tutorial.html#id2850736
However Eclipse CDT shows parsing
It seems to be a CDT issue. Have you updated your eclipse version lately? There is a discussion on that topic in the eclipse forum going on:
http://www.eclipse.org/forums/index.php/t/216821/
Maybe it gives you some inspiration on how to work around that problem.
EDIT: As a temporary work around, you can disable certain code analysis features and markers. To do so, go to Window->Preferences->"C/C++"->"Code Analysis" and disable some or all problems. I have disabled all, since it will still highlight errors found during the compilation and I will not be confused by falsely declared problems.