In my language-ext library it's pretty trivial: class Hours : NewType<Hours, double> { public Hours(double x) : base(x) {} } It gives you:

In my language-ext library it's pretty trivial: class Hours : NewType<Hours, double> { public Hours(double x) : base(x) {} } It gives you: * Equality operators, Equals, and IEquatable * Ordering operators, CompareTo, and IComparable * GetHashCode, ToString * Map, Select, Bind, SelectMany, Fold, ForAll, Exists, Iter * Explict conversion operator to convert from the NewType to the internal wrapped type * Serialisation * Hours.New(x) constructor function (often useful when used with other methods that take first-class functions). It's even possible with the more complex variants to provide predicates that will run on construction to constrain the values going in. There's also NumType for integer numeric types like int, long, etc. and FloatType for floating-point numeric types like float, double, etc. They give additional functionality by default. Also, units of measure [4]: Length x = 10*inches; Area y = x * x; Time t = 10*sec; [1] NewType - https://github.com/louthy/language-ext/tree/master/LanguageExt.Core/DataTypes/NewType https://github.com/louthy/language-ext/tree/master/LanguageE... [2] NumType - https://github.com/louthy/language-ext/tree/master/LanguageExt.Core/DataTypes/NumType https://github.com/louthy/language-ext/tree/master/LanguageE... [3] FloatType - https://github.com/louthy/language-ext/tree/master/LanguageExt.Core/DataTypes/FloatType https://github.com/louthy/language-ext/tree/master/LanguageE... [4] Units of Measure - https://github.com/louthy/language-ext/tree/master/LanguageExt.Core/DataTypes/UnitsOfMeasure https://github.com/louthy/language-ext/tree/master/LanguageE...