It would appear there is interest in this library. Therefore, I am making the full source available on GitHub here: https://github.com/cppmaven/VerifiedInt The library consists of three header files: verified_int.hpp (the integer class) verified_int_policies.hpp (the overflow handling policies) detail/verified_int_overflow_detection.hpp (the TMP overflow detection routines) In addition, you will notice that some of the hundreds of unit tests make use of the metaassert.hpp capability. The VerifiedInt library contains a number of static assertions. MetaAssert allows me to write unit tests, which will pass only if the static assertion fails instead of passing. The trick is to convert what would be a compiler error into a runtime exception, and then detect the exception in the unit test. Enjoy! Ben Robinson