I could have sworn I saw an example using boost to do simple numeric bounds checking. For example (silly): enum number_range {A=0,B=1,C=2,D=3,E=4,F=5,G=6,H=7}; class check_number_range { public: check_number_range(number_range a_number) { // Can this check be boostified? <--- Question located here. if ((a_number) > -1) && (a_number) < 8)) { // do something } else { throw out_of_range; } } }; thanks much, graham