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Allow LFSR to be instantiated with a given value.

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Thomas Harte
2020-04-05 22:58:09 -04:00
parent db4b71fc9a
commit 027af5acca
1 changed files with 10 additions and 0 deletions
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10
Numeric/LFSR.hpp
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@@ -37,6 +37,9 @@ template <> struct LSFRPolynomial<uint8_t> {
*/ */
template <typename IntType = uint64_t, IntType polynomial = LSFRPolynomial<IntType>::value> class LFSR { template <typename IntType = uint64_t, IntType polynomial = LSFRPolynomial<IntType>::value> class LFSR {
public: public:
/*!
Constructs an LFSR with a random initial value.
*/
LFSR() { LFSR() {
// Randomise the value, ensuring it doesn't end up being 0. // Randomise the value, ensuring it doesn't end up being 0.
while(!value_) { 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, Advances the LSFR, returning either an @c IntType of value @c 1 or @c 0,
determining the bit that was just shifted out. determining the bit that was just shifted out.