Type bitindex_t: accessing bits in bitstrings

To reference a particular bit in a bitstring, you have to use an index of type bitindex_t.

datatype: bitindex_t

For information, the private datatype is defined as follows:

typedef struct bitindex_t { int index; /* the index of the referenced bit, starting from 0 */ int word; /* the index of the word containing the bit, starting from 0 */ bitstring_t bit; /* the mask selecting the right bit */ } bitindex_t;

Function: bitindex_t bitindex_init (int col)

Return a bitindex referencing the colth bit of any bitstring.

Function: void bitindex_inc (bitindex_t* b)

Increments the bitindex b by one, i.e. after the call the bitindex references the next bit.

Function: void bitindex_dec (bitindex_t* b)

Decrements the bitindex b by one, i.e. after the call the bitindex references the next bit.

Function: int bitindex_size (int n)

Return the number of elements of type bitstring_t needed to represent N bits.