PrimeOrderCalculator converted to a template.

PerfectNumbers.Core/PrimeOrderCalculatorConfig.cs

@@ -0,0 +1,34 @@
+using System.Runtime.CompilerServices;
+
+namespace PerfectNumbers.Core;
+
+public readonly struct PrimeOrderCalculatorConfig(uint smallFactorLimit, int pollardRhoMilliseconds, int maxPowChecks, bool strictMode, int maxSeconds = 0)
+{
+	private static PrimeOrderCalculatorConfig _heuristicDefault = CreateHeuristicDefault(UnboundedTaskScheduler.ConfiguredThreadCount);
+
+	public static PrimeOrderCalculatorConfig HeuristicDefault
+	{
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		get => _heuristicDefault;
+	}
+
+	public static readonly PrimeOrderCalculatorConfig StrictDefault = new(smallFactorLimit: 1_000_000, pollardRhoMilliseconds: 0, maxPowChecks: 0, true);
+
+	public static void ConfigureHeuristicDefault(int threadCount)
+	{
+		_heuristicDefault = CreateHeuristicDefault(threadCount);
+	}
+
+	public static PrimeOrderCalculatorConfig CreateHeuristicDefault(int threadCount)
+	{
+		int normalizedThreadCount = threadCount < 1 ? 1 : threadCount;
+		return new(smallFactorLimit: 100_000, pollardRhoMilliseconds: normalizedThreadCount * 24, maxPowChecks: 24, false);
+	}
+
+	public readonly uint SmallFactorLimit = smallFactorLimit;
+	public readonly int PollardRhoMilliseconds = pollardRhoMilliseconds;
+	public readonly int MaxPowChecks = maxPowChecks;
+	public readonly int MaxPowChecksCapacity = maxPowChecks << 2;
+	public readonly bool StrictMode = strictMode;
+	public readonly int MaxSeconds = maxSeconds;
+}