class Bitset

Public Class Methods

from_s(p1) click to toggle source

static VALUE rb_bitset_from_s(VALUE self, VALUE s) {
    int length = RSTRING_LEN(s);
    char* data = StringValuePtr(s);

    Bitset * new_bs = bitset_new();
    bitset_setup(new_bs, length);

    int i;
    for (i = 0; i < length; i++) {
        if (data[i] == '1') {
            set_bit(new_bs, i);
        }
    }

    return Data_Wrap_Struct(cBitset, 0, bitset_free, new_bs);
}

new(p1) click to toggle source

static VALUE rb_bitset_initialize(VALUE self, VALUE len) {
    Bitset * bs = get_bitset(self);
    bitset_setup(bs, NUM2INT(len));
    return self;
}

Public Instance Methods

&(p1)

Alias for: intersect

-(p1)

Alias for: difference

[](p1) click to toggle source

static VALUE rb_bitset_aref(VALUE self, VALUE index) {
    Bitset * bs = get_bitset(self);
    int idx = NUM2INT(index);
    validate_index(bs, idx);
    return get_bit(bs, idx) > 0 ? Qtrue : Qfalse;
}

[]=(p1, p2) click to toggle source

static VALUE rb_bitset_aset(VALUE self, VALUE index, VALUE value) {
    Bitset * bs = get_bitset(self);
    int idx = NUM2INT(index);
    validate_index(bs, idx);
    assign_bit(bs, idx, value);
    return Qtrue;
}

^(p1)

Alias for: xor

cardinality() click to toggle source

static VALUE rb_bitset_cardinality(VALUE self) {
    Bitset * bs = get_bitset(self);
    int i;
    int max = ((bs->len-1) >> 6) + 1;
    int count = 0;
    for(i = 0; i < max; i++) {
        uint64_t segment = bs->data[i];
        if(i+1 == max && (bs->len & 0x3F))
            segment &= ((((uint64_t) 1) << (bs->len & 0x3F)) - 1);
        count += __builtin_popcountll(segment);
    }
    return INT2NUM(count);
}

clear(*args) click to toggle source

static VALUE rb_bitset_clear(int argc, VALUE * argv, VALUE self) {
    int i;
    Bitset * bs = get_bitset(self);

    if (argc == 1 && rb_obj_is_kind_of(argv[0], rb_const_get(rb_cObject, rb_intern("Array")))) {
        for(i = 0; i < RARRAY_LEN(argv[0]); i++) {
            VALUE index = RARRAY_PTR(argv[0])[i];
            int idx = NUM2INT(index);
            validate_index(bs, idx);
            clear_bit(bs, idx);
        }
    } else {
        for(i = 0; i < argc; i++) {
            VALUE index = argv[i];
            int idx = NUM2INT(index);
            validate_index(bs, idx);
            clear_bit(bs, idx);
        }
    }
    return Qtrue;
}

clear?(*args) click to toggle source

static VALUE rb_bitset_clear_p(int argc, VALUE * argv, VALUE self) {
    int i;
    Bitset * bs = get_bitset(self);
    for(i = 0; i < argc; i++) {
        VALUE index = argv[i];
        int idx = NUM2INT(index);
        validate_index(bs, idx);
        if(get_bit(bs, idx) > 0)
            return Qfalse;
    }
    return Qtrue;
}

difference(p1) click to toggle source

static VALUE rb_bitset_difference(VALUE self, VALUE other) {
    Bitset * bs = get_bitset(self);
    Bitset * other_bs = get_bitset(other);

    Bitset * new_bs = bitset_new();
    bitset_setup(new_bs, bs->len);

    int max = ((bs->len-1) >> 6) + 1;
    int i;
    for(i = 0; i < max; i++) {
        uint64_t segment = bs->data[i];
        uint64_t other_segment = other_bs->data[i];
        new_bs->data[i] = segment & ~other_segment;
    }

    return Data_Wrap_Struct(cBitset, 0, bitset_free, new_bs);
}

Also aliased as: -

each() click to toggle source

static VALUE rb_bitset_each(VALUE self) {
    Bitset * bs = get_bitset(self);
    int i;

    for(i = 0; i < bs->len; i++) {
        rb_yield(get_bit(bs, i) > 0 ? Qtrue : Qfalse);
    }

    return self;
}

hamming(p1) click to toggle source

static VALUE rb_bitset_hamming(VALUE self, VALUE other) {
    Bitset * bs = get_bitset(self);
    Bitset * other_bs = get_bitset(other);

    int max = ((bs->len-1) >> 6) + 1;
    int count = 0;
    int i;
    for(i = 0; i < max; i++) {
        uint64_t segment = bs->data[i];
        uint64_t other_segment = other_bs->data[i];
        count += __builtin_popcountll(segment ^ other_segment);
    }

    return INT2NUM(count);
}

intersect(p1) click to toggle source

static VALUE rb_bitset_intersect(VALUE self, VALUE other) {
    Bitset * bs = get_bitset(self);
    Bitset * other_bs = get_bitset(other);

    Bitset * new_bs = bitset_new();
    bitset_setup(new_bs, bs->len);

    int max = ((bs->len-1) >> 6) + 1;
    int i;
    for(i = 0; i < max; i++) {
        uint64_t segment = bs->data[i];
        uint64_t other_segment = other_bs->data[i];
        new_bs->data[i] = segment & other_segment;
    }

    return Data_Wrap_Struct(cBitset, 0, bitset_free, new_bs);
}

Also aliased as: &

marshal_dump() click to toggle source

static VALUE rb_bitset_marshall_dump(VALUE self) {
    Bitset * bs = get_bitset(self);
    VALUE hash = rb_hash_new();
    VALUE data = rb_str_new(bs->data, BYTES(bs));

    rb_hash_aset(hash, ID2SYM(rb_intern("len")), UINT2NUM(bs->len));
    rb_hash_aset(hash, ID2SYM(rb_intern("data")), data);

    return hash;
}

marshal_load(p1) click to toggle source

static VALUE rb_bitset_marshall_load(VALUE self, VALUE hash) {
    Bitset * bs = get_bitset(self);
    int len = NUM2INT(rb_hash_aref(hash, ID2SYM(rb_intern("len"))));

    VALUE data = rb_hash_aref(hash, ID2SYM(rb_intern("data")));

    bitset_setup(bs, len);

    bs->data = (uint64_t *) calloc(INTS(bs), sizeof(uint64_t));
    memcpy(bs->data, RSTRING_PTR(data), BYTES(bs));

    return Qnil;
}

not() click to toggle source

static VALUE rb_bitset_not(VALUE self) {
    Bitset * bs = get_bitset(self);

    Bitset * new_bs = bitset_new();
    bitset_setup(new_bs, bs->len);

    int max = ((bs->len-1) >> 6) + 1;
    int i;
    for(i = 0; i < max; i++) {
        uint64_t segment = bs->data[i];
        new_bs->data[i] = ~segment;
    }

    return Data_Wrap_Struct(cBitset, 0, bitset_free, new_bs);
}

Also aliased as: ~

set(*args) click to toggle source

static VALUE rb_bitset_set(int argc, VALUE * argv, VALUE self) {
    int i;
    Bitset * bs = get_bitset(self);

    if (argc == 1 && rb_obj_is_kind_of(argv[0], rb_const_get(rb_cObject, rb_intern("Array")))) {
        for(i = 0; i < RARRAY_LEN(argv[0]); i++) {
            VALUE index = RARRAY_PTR(argv[0])[i];
            int idx = NUM2INT(index);
            validate_index(bs, idx);
            set_bit(bs, idx);
        }
    } else {
        for(i = 0; i < argc; i++) {
            VALUE index = argv[i];
            int idx = NUM2INT(index);
            validate_index(bs, idx);
            set_bit(bs, idx);
        }
    }
    return Qtrue;
}

set?(*args) click to toggle source

static VALUE rb_bitset_set_p(int argc, VALUE * argv, VALUE self) {
    int i;
    Bitset * bs = get_bitset(self);
    for(i = 0; i < argc; i++) {
        VALUE index = argv[i];
        int idx = NUM2INT(index);
        validate_index(bs, idx);
        if(get_bit(bs, idx) == 0)
            return Qfalse;
    }
    return Qtrue;
}

size() click to toggle source

static VALUE rb_bitset_size(VALUE self, VALUE len) {
    Bitset * bs = get_bitset(self);
    return INT2NUM(bs->len);
}

symmetric_difference(p1)

Alias for: xor

to_a() click to toggle source

static VALUE rb_bitset_to_a(VALUE self) {
    Bitset * bs = get_bitset(self);
    int i;

    VALUE array = rb_ary_new2(bs->len / 2);
    for(i = 0; i < bs->len; i++) {
        if (get_bit(bs, i) > 0) {
            rb_ary_push(array, INT2NUM(i));
        }
    }

    return array;
}

to_binary_array() click to toggle source

static VALUE rb_bitset_to_binary_array(VALUE self) {
    Bitset * bs = get_bitset(self);
    int i;

    VALUE array = rb_ary_new2(bs->len / 2);
    for(i = 0; i < bs->len; i++) {
        rb_ary_push(array, INT2NUM(get_bit(bs, i) > 0 ? 1 : 0));
    }

    return array;
}

to_s() click to toggle source

static VALUE rb_bitset_to_s(VALUE self) {
    Bitset * bs = get_bitset(self);

    int i;
    char * data = malloc(bs->len + 1);
    for(i = 0; i < bs->len; i++) {
        data[i] = get_bit(bs, i)  ? '1' : '0';
    }
    data[bs->len] = 0;

    return rb_str_new2(data);
}

union(p1) click to toggle source

static VALUE rb_bitset_union(VALUE self, VALUE other) {
    Bitset * bs = get_bitset(self);
    Bitset * other_bs = get_bitset(other);

    Bitset * new_bs = bitset_new();
    bitset_setup(new_bs, bs->len);

    int max = ((bs->len-1) >> 6) + 1;
    int i;
    for(i = 0; i < max; i++) {
        uint64_t segment = bs->data[i];
        uint64_t other_segment = other_bs->data[i];
        new_bs->data[i] = segment | other_segment;
    }

    return Data_Wrap_Struct(cBitset, 0, bitset_free, new_bs);
}

Also aliased as: |

xor(p1) click to toggle source

static VALUE rb_bitset_xor(VALUE self, VALUE other) {
    Bitset * bs = get_bitset(self);
    Bitset * other_bs = get_bitset(other);

    Bitset * new_bs = bitset_new();
    bitset_setup(new_bs, bs->len);

    int max = ((bs->len-1) >> 6) + 1;
    int i;
    for(i = 0; i < max; i++) {
        uint64_t segment = bs->data[i];
        uint64_t other_segment = other_bs->data[i];
        new_bs->data[i] = segment ^ other_segment;
    }

    return Data_Wrap_Struct(cBitset, 0, bitset_free, new_bs);
}

Also aliased as: ^, symmetric_difference

|(p1)

Alias for: union

~()

Alias for: not