A money data type, for easy and safe handling of currency amounts

Package Information

Version2.0.0 (2016-Jul-01)
CopyrightCopyright © 2016, Andreas Zwinkau
AuthorsAndreas Zwinkau <>
Registered byqznc
Dependencies none


To use this package, put the following dependency into your project's dependencies section:



Build Status Coverage Status Dub Package


Handling amounts of money safely and efficiently.

Floating point is imprecise. Integer is fragile. BigNum and similar are slow. All lack type safety, like forbidding addition different currencies.


  • support different rounding modes
  • can not mix currencies (e.g. EUR vs USD)
  • efficient integer arithmetic
  • overflow checking for arithmetic
  • type checking for currencies, precision, and rounding mode
  • yet generic equality and comparison
    alias EUR = currency!("EUR");

    assert(EUR(100.0001) == EUR(100.00009));
    assert(EUR(3.10) + EUR(1.40) == EUR(4.50));
    assert(EUR(3.10) - EUR(1.40) == EUR(1.70));
    assert(EUR(10.01) * 1.1 == EUR(11.011));

    writefln("%d", EUR(3.6)); // "4EUR"
    writefln("%f", EUR(3.141592)); // "3.1416EUR"
    writefln("%.2f", EUR(3.145)); // "3.15EUR"

Scope is smaller than JSR 354, for example, which also considers conversion and meta data. A conversion rate depends on target date and time, the currencies involved, the provider, the amount, and other factors. If you need meta data, then wrap currency into your own data type.

Available via dub on

DDoc documentation on Github pages.

Licence is Boost v1.0.

Available versions

2.0.0 1.0.0 0.2.0 0.1.0 ~master