Typesafe currency conversion.

A typesafe currency conversion system with a various exchange rate sources for over 30 currencies.

currency-convert

This module allows values of currency to be converted from one currency to another using exchange rates from various sources.

The basic operation for this module is as follows:

First, get a conversion function (with getDefaultConverter or getConverter):

    >>> Converter convert <- getDefaultConverter

Then, construct some value of currency using the convenience functions, and convert it using the convert function you just got:

    >>> convert (usd 100) :: EUR
    90.0 eur

The result type of convert defines what currency the value will be converted into.

Currency implements Num, Fractional and Real so the usual arithmetic operations are defined, and its value can be extracted with toRational.