The C++ Clamped Numbers API provides wrappers for numeric types like int and double which constrain their values to within specified bounds. Custom numeric types (such as one representing roman numeral values) can also be used with these wrappers provided they implement the necessary operators.
There are three class templates for wrapping different types of numbers. ClampedNaturalNumber is designed to wrap unsigned integral types like size_t and corresponds with the set of natural numbers (including zero), ℕ. ClampedInteger is designed to wrap signed integral types like int amd corresponds with the set of integers, ℤ. Lastly, ClampedDecimal is designed to wrap floating-point types like double and corresponds with the set of all real numbers, ℝ.