set bit

+Setting a bit
number |= 1 << n;
That will set a bit n.
+Clearing a bit
number &= ~(1 << n);
+Toggling a bit
number ^= 1 << n;
+Checking a bit
bit = (number >> n) & 1;
+Changing the nth bit to x
number ^= (-x ^ number) & (1 << n);
number = number & ~(1 << n) | (x << n);
std::bitset<8> x;
x[1] = 1;
x[2] = 0;

    bit_set(<<D/integer>>,Pos,0) ->  <<(D band bnot(1 bsl Pos))/integer>>;
    bit_set(<<D/integer>>,Pos,Val) -> <<(D bor (1 bsl Pos))/integer>>.

bit_set(<<D/unsigned>>,Pos,Val) -><<(    D band bnot(1 bsl Pos) bor (Val bsl Pos)  )/unsigned>>.