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Units of measurement for Ada


The library provides an implementation of dimensioned values for Ada. Unit checks are made at run-time, if not optimized out by the compiler. SI and irregular measurement units are supported. Shifted units like degrees Celsius are supported too. Conversions from and back to strings are provided for all various irregular units. An extensive set of GTK widgets for dealing with dimensioned values is included, though use of GTK is not mandatory for the rest of the library.


  • The type Unit denotes the dimension of a physical entity
  • The type Measure represents a dimensioned value
  • Mixed unit arithmetic. Values in SI (Le Système International d'Unités) units can be mixed with irregular units (such as foot and yard) as long as the result is defined
  • Shifted unit support (a widely used instance of a shifted unit is degree of Celsius)
  • The type Measure is generic, parameterized by a floating-point type. A non-generic version based on the type Float is also provided
  • String to Measure conversion supports as wide set of irregular units as possible
  • Currently the powers of the base unit components lie in the range -8..7. This limitation has an implementation reason (absence of 64-bit modular integers in some Ada compilers)
  • GTK+ widgets for a comfortable visual measurement unit editing and selection. The rest of the library can be used independently on this part as well as on GTK+
  • Ada 95, 2005, 2012 compliant. GTK+ widgets require at least Ada 2005
  • Tables for Ada and Strings Edit for Ada libraries are included



User interface

Win32 (MS Windows), GTK+

Programming Language


This is an application that can also be fetched from https://sourceforge.net/projects/unitsofmeasurementforada/. It has been hosted in OnWorks in order to be run online in an easiest way from one of our free Operative Systems.

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