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Adds necessary standalone #imports; makes safe for signed types.

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This commit is contained in:
Thomas Harte 2020-04-25 22:21:10 -04:00
parent 65a3783dd2
commit a5d1941d28
1 changed files with 6 additions and 2 deletions
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8
Numeric/LFSR.hpp
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@ -9,6 +9,9 @@
#ifndef LFSR_h
#define LFSR_h
#include <cstdint>
#include <cstdlib>
namespace Numeric {
template <typename IntType> struct LSFRPolynomial {};
@ -41,11 +44,12 @@ template <typename IntType = uint64_t, IntType polynomial = LSFRPolynomial<IntTy
Constructs an LFSR with a random initial value.
*/
LFSR() {
// Randomise the value, ensuring it doesn't end up being 0.
// Randomise the value, ensuring it doesn't end up being 0;
// don't set any top bits, in case this is a signed type.
while(!value_) {
uint8_t *value_byte = reinterpret_cast<uint8_t *>(&value_);
for(size_t c = 0; c < sizeof(IntType); ++c) {
*value_byte = uint8_t(uint64_t(rand()) * 255 / RAND_MAX);
*value_byte = uint8_t(uint64_t(rand()) * 127 / RAND_MAX);
++value_byte;
}
}