SpecialValue is a C++ library that allows special numeric values to be represented accurately. This is useful for fractions that would normally be approximated as floating point, or numbers that are normally impossible to store, such as sqrt(-2).
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The interface has changed. This is a bad thing to
do, but it was required by the Arithmos project,
for which this library is developed after all.
The internal representation was adapted such that
the library now implements the ideas in the
article "Universal semantics for computer
arithmetic implementations" by B. Verdonk, J.
Vervloet, and A. Cuyt, which has been submitted to
TJCS.