Extended class

Class providing calculation with the native floating point format of the processor.

This class provides floating point calculation in the native floating point format of the processor. The extended class stores data with 64bit mantissa instead of 53bit in double.

The class is intended for calculations depending critically on the mantissa length. Summing a large with a small value generally leads to a truncation error of the small value to fit into the mantissa. The extended precision relaxes this constraint, useful to verify the accuracy of a numerical result.