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using System; | |
using System.Numerics; | |
namespace Common | |
{ | |
/// <summary> | |
/// Arbitrary precision decimal. | |
/// All operations are exact, except for division. Division never determines more digits than the given precision. | |
/// Source: https://gist.github.com/JcBernack/0b4eef59ca97ee931a2f45542b9ff06d | |
/// Based on https://stackoverflow.com/a/4524254 |
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/// <summary> | |
/// Fast exponential approximation. | |
/// </summary> | |
/// <remarks> | |
/// Based on "A Fast, Compact Approximation of the Exponential Function" by Nicol N.Schraudolph (1999) | |
/// <code>e^x ~ a*x + b | |
/// a = 2 ^ (mantissa bits) / ln(2) ~ 12102203 | |
/// b = (exponent bias) * 2^(mantissa bits) ~ 1065353216</code> | |
/// </remarks> | |
/// <param name="x">A number specifying a power.</param> |