add()

void M2::ARingGFM2::add ( elem & result, elem a, elem b ) const

inline

Definition at line 258 of file aring-m2-gf.hpp.

  {
    if (a == 0)
      result = b;
    else if (b == 0)
      result = a;
    else
      {
        int n = a - b;
        if (n > 0)
          {
            if (n == mGF.minusOne())
              result = 0;
            else
              result = modulus_add(b, mGF.oneTable(n), mGF.orderMinusOne());
          }
        else if (n < 0)
          {
            if (-n == mGF.minusOne())
              result = 0;
            else
              result = modulus_add(a, mGF.oneTable(-n), mGF.orderMinusOne());
          }
        else
          {
            if (mGF.characteristic() == 2)
              result = 0;
            else
              result =
                  modulus_add(a, mGF.oneTable(mGF.one()), mGF.orderMinusOne());
          }
      }
  }

References mGF, modulus_add(), and result().

Referenced by fromSmallIntegerCoefficients(), and subtract().