From 027af5acca4e07b4ff802bd7e6df43cbc7e36fcb Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Sun, 5 Apr 2020 22:58:09 -0400
Subject: [PATCH] Allow LFSR to be instantiated with a given value.

---
 Numeric/LFSR.hpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Numeric/LFSR.hpp b/Numeric/LFSR.hpp
index 9802bb893..408ee6725 100644
--- a/Numeric/LFSR.hpp
+++ b/Numeric/LFSR.hpp
@@ -37,6 +37,9 @@ template <> struct LSFRPolynomial<uint8_t> {
 */
 template <typename IntType = uint64_t, IntType polynomial = LSFRPolynomial<IntType>::value> class LFSR {
 	public:
+		/*!
+			Constructs an LFSR with a random initial value.
+		*/
 		LFSR() {
 			// Randomise the value, ensuring it doesn't end up being 0.
 			while(!value_) {
@@ -48,6 +51,13 @@ template <typename IntType = uint64_t, IntType polynomial = LSFRPolynomial<IntTy
 			}
 		}
 
+		/*!
+			Constructs an LFSR with the specified initial value.
+
+			An initial value of 0 is invalid.
+		*/
+		LFSR(IntType initial_value) : value_(initial_value) {}
+
 		/*!
 			Advances the LSFR, returning either an @c IntType of value @c 1 or @c 0,
 			determining the bit that was just shifted out.