[CMake] How to iterator over a set of directories containing projects?

[Peter]

I have a bunch (50+) of sample programs deep in the hierarchy of my 
library project. Each of these samples has a similar CMakeLists.txt 
file, like

     add_executable( binning binning.cpp )
     target_link_libraries( binning ${Boost_LIBRARIES} )

where binning would be the name of the sample as well as the name of the 
directory. I'm wondering if there would be a way to avoid authoring 
these similar CMakeLists.txt files and instead somehow iterate over all 
the projects in the CMakeLists.txt file which is one level higher in the 
hierarchy?

Peter