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Encoder for Simplex codes

#pragma once

namespace CODE {

template <int K>

class SimplexEncoder

{

static const int W = 1 << K;

static const int N = (1 << K) - 1;

int8_t mod[W];

static bool parity(unsigned x)

{

x ^= x >> 16;

x ^= x >> 8;

x ^= x >> 4;

x ^= x >> 2;

x ^= x >> 1;

return x & 1;

}

public:

SimplexEncoder()

{

for (int i = 0; i < W; ++i)

mod[i] = 1 - 2 * parity(i);

}

void operator()(int8_t *code, int msg)

{

for (int i = 0; i < N; ++i)

code[i] = mod[msg&(i+1)];

}

};

}