class Fixnum - Ruby 2.2.4 Core API Reference API Reference

Ruby 2.2 Core API

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class Fixnum

Holds Integer values that can be represented in a native machine word (minus 1 bit). If any operation on a Fixnum exceeds this range, the value is automatically converted to a Bignum.

Fixnum objects have immediate value. This means that when they are assigned or passed as parameters, the actual object is passed, rather than a reference to that object.

Assignment does not alias Fixnum objects. There is effectively only one Fixnum object instance for any given integer value, so, for example, you cannot add a singleton method to a Fixnum. Any attempt to add a singleton method to a Fixnum object will raise a TypeError.

In Files

numeric.c

Parent

Integer

Public Instance Methods

fix % other → real click to toggle source

modulo(other) → real

Returns fix modulo other.

See Numeric#divmod for more information.

static VALUE
fix_mod(VALUE x, VALUE y)
{
    if (FIXNUM_P(y)) {
        long mod;

        fixdivmod(FIX2LONG(x), FIX2LONG(y), 0, &mod);
        return LONG2NUM(mod);
    }
    else if (RB_TYPE_P(y, T_BIGNUM)) {
        x = rb_int2big(FIX2LONG(x));
        return rb_big_modulo(x, y);
    }
    else if (RB_TYPE_P(y, T_FLOAT)) {
        return DBL2NUM(ruby_float_mod((double)FIX2LONG(x), RFLOAT_VALUE(y)));
    }
    else {
        return rb_num_coerce_bin(x, y, '%');
    }
}

fix & integer → integer_result click to toggle source

Bitwise AND.

static VALUE
fix_and(VALUE x, VALUE y)
{
    if (FIXNUM_P(y)) {
        long val = FIX2LONG(x) & FIX2LONG(y);
        return LONG2NUM(val);
    }

    if (RB_TYPE_P(y, T_BIGNUM)) {
        return rb_big_and(y, x);
    }

    bit_coerce(&x, &y);
    return rb_funcall(x, rb_intern("&"), 1, y);
}

fix * numeric → numeric_result click to toggle source

Performs multiplication: the class of the resulting object depends on the class of numeric and on the magnitude of the result. It may return a Bignum.

static VALUE
fix_mul(VALUE x, VALUE y)
{
    if (FIXNUM_P(y)) {
#ifdef __HP_cc
/* avoids an optimization bug of HP aC++/ANSI C B3910B A.06.05 [Jul 25 2005] */
        volatile
#endif
        long a, b;
#if SIZEOF_LONG * 2 <= SIZEOF_LONG_LONG
        LONG_LONG d;
#else
        VALUE r;
#endif

        a = FIX2LONG(x);
        b = FIX2LONG(y);

#if SIZEOF_LONG * 2 <= SIZEOF_LONG_LONG
        d = (LONG_LONG)a * b;
        if (FIXABLE(d)) return LONG2FIX(d);
        return rb_ll2inum(d);
#else
        if (a == 0) return x;
        if (MUL_OVERFLOW_FIXNUM_P(a, b))
            r = rb_big_mul(rb_int2big(a), rb_int2big(b));
        else
            r = LONG2FIX(a * b);
        return r;
#endif
    }
    else if (RB_TYPE_P(y, T_BIGNUM)) {
        return rb_big_mul(y, x);
    }
    else if (RB_TYPE_P(y, T_FLOAT)) {
        return DBL2NUM((double)FIX2LONG(x) * RFLOAT_VALUE(y));
    }
    else {
        return rb_num_coerce_bin(x, y, '*');
    }
}

fix ** numeric → numeric_result click to toggle source

Raises fix to the power of numeric, which may be negative or fractional.

2 ** 3      #=> 8
2 ** -1     #=> (1/2)
2 ** 0.5    #=> 1.4142135623731

static VALUE
fix_pow(VALUE x, VALUE y)
{
    long a = FIX2LONG(x);

    if (FIXNUM_P(y)) {
        long b = FIX2LONG(y);

        if (a == 1) return INT2FIX(1);
        if (a == -1) {
            if (b % 2 == 0)
                return INT2FIX(1);
            else
                return INT2FIX(-1);
        }
        if (b < 0)
            return rb_funcall(rb_rational_raw1(x), rb_intern("**"), 1, y);

        if (b == 0) return INT2FIX(1);
        if (b == 1) return x;
        if (a == 0) {
            if (b > 0) return INT2FIX(0);
            return DBL2NUM(INFINITY);
        }
        return int_pow(a, b);
    }
    else if (RB_TYPE_P(y, T_BIGNUM)) {
        if (a == 1) return INT2FIX(1);
        if (a == -1) {
            if (int_even_p(y)) return INT2FIX(1);
            else return INT2FIX(-1);
        }
        if (negative_int_p(y))
            return rb_funcall(rb_rational_raw1(x), rb_intern("**"), 1, y);
        if (a == 0) return INT2FIX(0);
        x = rb_int2big(FIX2LONG(x));
        return rb_big_pow(x, y);
    }
    else if (RB_TYPE_P(y, T_FLOAT)) {
        if (RFLOAT_VALUE(y) == 0.0) return DBL2NUM(1.0);
        if (a == 0) {
            return DBL2NUM(RFLOAT_VALUE(y) < 0 ? INFINITY : 0.0);
        }
        if (a == 1) return DBL2NUM(1.0);
        {
            double dy = RFLOAT_VALUE(y);
            if (a < 0 && dy != round(dy))
                return rb_funcall(rb_complex_raw1(x), rb_intern("**"), 1, y);
            return DBL2NUM(pow((double)a, dy));
        }
    }
    else {
        return rb_num_coerce_bin(x, y, rb_intern("**"));
    }
}

fix + numeric → numeric_result click to toggle source

Performs addition: the class of the resulting object depends on the class of numeric and on the magnitude of the result. It may return a Bignum.

static VALUE
fix_plus(VALUE x, VALUE y)
{
    if (FIXNUM_P(y)) {
        long a, b, c;
        VALUE r;

        a = FIX2LONG(x);
        b = FIX2LONG(y);
        c = a + b;
        r = LONG2NUM(c);

        return r;
    }
    else if (RB_TYPE_P(y, T_BIGNUM)) {
        return rb_big_plus(y, x);
    }
    else if (RB_TYPE_P(y, T_FLOAT)) {
        return DBL2NUM((double)FIX2LONG(x) + RFLOAT_VALUE(y));
    }
    else {
        return rb_num_coerce_bin(x, y, '+');
    }
}

fix - numeric → numeric_result click to toggle source

Performs subtraction: the class of the resulting object depends on the class of numeric and on the magnitude of the result. It may return a Bignum.

static VALUE
fix_minus(VALUE x, VALUE y)
{
    if (FIXNUM_P(y)) {
        long a, b, c;
        VALUE r;

        a = FIX2LONG(x);
        b = FIX2LONG(y);
        c = a - b;
        r = LONG2NUM(c);

        return r;
    }
    else if (RB_TYPE_P(y, T_BIGNUM)) {
        x = rb_int2big(FIX2LONG(x));
        return rb_big_minus(x, y);
    }
    else if (RB_TYPE_P(y, T_FLOAT)) {
        return DBL2NUM((double)FIX2LONG(x) - RFLOAT_VALUE(y));
    }
    else {
        return rb_num_coerce_bin(x, y, '-');
    }
}

-fix → integer click to toggle source

Negates fix, which may return a Bignum.

static VALUE
fix_uminus(VALUE num)
{
    return LONG2NUM(-FIX2LONG(num));
}

fix / numeric → numeric_result click to toggle source

Performs division: the class of the resulting object depends on the class of numeric and on the magnitude of the result. It may return a Bignum.

static VALUE
fix_div(VALUE x, VALUE y)
{
    return fix_divide(x, y, '/');
}

fix < real → true or false click to toggle source

Returns true if the value of fix is less than that of real.

static VALUE
fix_lt(VALUE x, VALUE y)
{
    if (FIXNUM_P(y)) {
        if (FIX2LONG(x) < FIX2LONG(y)) return Qtrue;
        return Qfalse;
    }
    else if (RB_TYPE_P(y, T_BIGNUM)) {
        return FIX2INT(rb_big_cmp(rb_int2big(FIX2LONG(x)), y)) < 0 ? Qtrue : Qfalse;
    }
    else if (RB_TYPE_P(y, T_FLOAT)) {
        return rb_integer_float_cmp(x, y) == INT2FIX(-1) ? Qtrue : Qfalse;
    }
    else {
        return rb_num_coerce_relop(x, y, '<');
    }
}

fix << count → integer click to toggle source

Shifts fix left count positions, or right if count is negative.

static VALUE
rb_fix_lshift(VALUE x, VALUE y)
{
    long val, width;

    val = NUM2LONG(x);
    if (!FIXNUM_P(y))
        return rb_big_lshift(rb_int2big(val), y);
    width = FIX2LONG(y);
    if (width < 0)
        return fix_rshift(val, (unsigned long)-width);
    return fix_lshift(val, width);
}

fix <= real → true or false click to toggle source

Returns true if the value of fix is less than or equal to that of real.

static VALUE
fix_le(VALUE x, VALUE y)
{
    if (FIXNUM_P(y)) {
        if (FIX2LONG(x) <= FIX2LONG(y)) return Qtrue;
        return Qfalse;
    }
    else if (RB_TYPE_P(y, T_BIGNUM)) {
        return FIX2INT(rb_big_cmp(rb_int2big(FIX2LONG(x)), y)) <= 0 ? Qtrue : Qfalse;
    }
    else if (RB_TYPE_P(y, T_FLOAT)) {
        VALUE rel = rb_integer_float_cmp(x, y);
        return rel == INT2FIX(-1) || rel == INT2FIX(0) ? Qtrue : Qfalse;
    }
    else {
        return rb_num_coerce_relop(x, y, rb_intern("<="));
    }
}

fix <=> numeric → -1, 0, +1 or nil click to toggle source

Comparison—Returns -1, 0, +1 or nil depending on whether fix is less than, equal to, or greater than numeric.

This is the basis for the tests in the Comparable module.

nil is returned if the two values are incomparable.

static VALUE
fix_cmp(VALUE x, VALUE y)
{
    if (x == y) return INT2FIX(0);
    if (FIXNUM_P(y)) {
        if (FIX2LONG(x) > FIX2LONG(y)) return INT2FIX(1);
        return INT2FIX(-1);
    }
    else if (RB_TYPE_P(y, T_BIGNUM)) {
        return rb_big_cmp(rb_int2big(FIX2LONG(x)), y);
    }
    else if (RB_TYPE_P(y, T_FLOAT)) {
        return rb_integer_float_cmp(x, y);
    }
    else {
        return rb_num_coerce_cmp(x, y, id_cmp);
    }
}

fix == other → true or false click to toggle source

Return true if fix equals other numerically.

1 == 2      #=> false
1 == 1.0    #=> true

static VALUE
fix_equal(VALUE x, VALUE y)
{
    if (x == y) return Qtrue;
    if (FIXNUM_P(y)) return Qfalse;
    else if (RB_TYPE_P(y, T_BIGNUM)) {
        return rb_big_eq(y, x);
    }
    else if (RB_TYPE_P(y, T_FLOAT)) {
        return rb_integer_float_eq(x, y);
    }
    else {
        return num_equal(x, y);
    }
}

fix == other → true or false click to toggle source

Return true if fix equals other numerically.

1 == 2      #=> false
1 == 1.0    #=> true

static VALUE
fix_equal(VALUE x, VALUE y)
{
    if (x == y) return Qtrue;
    if (FIXNUM_P(y)) return Qfalse;
    else if (RB_TYPE_P(y, T_BIGNUM)) {
        return rb_big_eq(y, x);
    }
    else if (RB_TYPE_P(y, T_FLOAT)) {
        return rb_integer_float_eq(x, y);
    }
    else {
        return num_equal(x, y);
    }
}

fix > real → true or false click to toggle source

Returns true if the value of fix is greater than that of real.

static VALUE
fix_gt(VALUE x, VALUE y)
{
    if (FIXNUM_P(y)) {
        if (FIX2LONG(x) > FIX2LONG(y)) return Qtrue;
        return Qfalse;
    }
    else if (RB_TYPE_P(y, T_BIGNUM)) {
        return FIX2INT(rb_big_cmp(rb_int2big(FIX2LONG(x)), y)) > 0 ? Qtrue : Qfalse;
    }
    else if (RB_TYPE_P(y, T_FLOAT)) {
        return rb_integer_float_cmp(x, y) == INT2FIX(1) ? Qtrue : Qfalse;
    }
    else {
        return rb_num_coerce_relop(x, y, '>');
    }
}

fix >= real → true or false click to toggle source

Returns true if the value of fix is greater than or equal to that of real.

static VALUE
fix_ge(VALUE x, VALUE y)
{
    if (FIXNUM_P(y)) {
        if (FIX2LONG(x) >= FIX2LONG(y)) return Qtrue;
        return Qfalse;
    }
    else if (RB_TYPE_P(y, T_BIGNUM)) {
        return FIX2INT(rb_big_cmp(rb_int2big(FIX2LONG(x)), y)) >= 0 ? Qtrue : Qfalse;
    }
    else if (RB_TYPE_P(y, T_FLOAT)) {
        VALUE rel = rb_integer_float_cmp(x, y);
        return rel == INT2FIX(1) || rel == INT2FIX(0) ? Qtrue : Qfalse;
    }
    else {
        return rb_num_coerce_relop(x, y, rb_intern(">="));
    }
}

fix >> count → integer click to toggle source

Shifts fix right count positions, or left if count is negative.

static VALUE
rb_fix_rshift(VALUE x, VALUE y)
{
    long i, val;

    val = FIX2LONG(x);
    if (!FIXNUM_P(y))
        return rb_big_rshift(rb_int2big(val), y);
    i = FIX2LONG(y);
    if (i == 0) return x;
    if (i < 0)
        return fix_lshift(val, (unsigned long)-i);
    return fix_rshift(val, i);
}

fix[n] → 0, 1 click to toggle source

Bit Reference—Returns the +n+th bit in the binary representation of fix, where fix[0] is the least significant bit.

For example:

a = 0b11001100101010
30.downto(0) do |n| print a[n] end
#=> 0000000000000000011001100101010

static VALUE
fix_aref(VALUE fix, VALUE idx)
{
    long val = FIX2LONG(fix);
    long i;

    idx = rb_to_int(idx);
    if (!FIXNUM_P(idx)) {
        idx = rb_big_norm(idx);
        if (!FIXNUM_P(idx)) {
            if (!BIGNUM_SIGN(idx) || val >= 0)
                return INT2FIX(0);
            return INT2FIX(1);
        }
    }
    i = FIX2LONG(idx);

    if (i < 0) return INT2FIX(0);
    if (SIZEOF_LONG*CHAR_BIT-1 <= i) {
        if (val < 0) return INT2FIX(1);
        return INT2FIX(0);
    }
    if (val & (1L<<i))
        return INT2FIX(1);
    return INT2FIX(0);
}

fix ^ integer → integer_result click to toggle source

Bitwise EXCLUSIVE OR.

static VALUE
fix_xor(VALUE x, VALUE y)
{
    if (FIXNUM_P(y)) {
        long val = FIX2LONG(x) ^ FIX2LONG(y);
        return LONG2NUM(val);
    }

    if (RB_TYPE_P(y, T_BIGNUM)) {
        return rb_big_xor(y, x);
    }

    bit_coerce(&x, &y);
    return rb_funcall(x, rb_intern("^"), 1, y);
}

abs → integer click to toggle source

magnitude → integer

Returns the absolute value of fix.

-12345.abs   #=> 12345
12345.abs    #=> 12345

static VALUE
fix_abs(VALUE fix)
{
    long i = FIX2LONG(fix);

    if (i < 0) i = -i;

    return LONG2NUM(i);
}

bit_length → integer click to toggle source

Returns the number of bits of the value of int.

“the number of bits” means that the bit position of the highest bit which is different to the sign bit. (The bit position of the bit 2**n is n+1.) If there is no such bit (zero or minus one), zero is returned.

I.e. This method returns ceil(log2(int < 0 ? -int : int+1)).

(-2**12-1).bit_length     #=> 13
(-2**12).bit_length       #=> 12
(-2**12+1).bit_length     #=> 12
-0x101.bit_length         #=> 9
-0x100.bit_length         #=> 8
-0xff.bit_length          #=> 8
-2.bit_length             #=> 1
-1.bit_length             #=> 0
0.bit_length              #=> 0
1.bit_length              #=> 1
0xff.bit_length           #=> 8
0x100.bit_length          #=> 9
(2**12-1).bit_length      #=> 12
(2**12).bit_length        #=> 13
(2**12+1).bit_length      #=> 13

This method can be used to detect overflow in Array#pack as follows.

if n.bit_length < 32
  [n].pack("l") # no overflow
else
  raise "overflow"
end

static VALUE
rb_fix_bit_length(VALUE fix)
{
    long v = FIX2LONG(fix);
    if (v < 0)
        v = ~v;
    return LONG2FIX(bit_length(v));
}

div(numeric) → integer click to toggle source

Performs integer division: returns integer result of dividing fix by numeric.

static VALUE
fix_idiv(VALUE x, VALUE y)
{
    return fix_divide(x, y, rb_intern("div"));
}

divmod(numeric) → array click to toggle source

See Numeric#divmod.

static VALUE
fix_divmod(VALUE x, VALUE y)
{
    if (FIXNUM_P(y)) {
        long div, mod;

        fixdivmod(FIX2LONG(x), FIX2LONG(y), &div, &mod);

        return rb_assoc_new(LONG2NUM(div), LONG2NUM(mod));
    }
    else if (RB_TYPE_P(y, T_BIGNUM)) {
        x = rb_int2big(FIX2LONG(x));
        return rb_big_divmod(x, y);
    }
    else if (RB_TYPE_P(y, T_FLOAT)) {
        {
            double div, mod;
            volatile VALUE a, b;

            flodivmod((double)FIX2LONG(x), RFLOAT_VALUE(y), &div, &mod);
            a = dbl2ival(div);
            b = DBL2NUM(mod);
            return rb_assoc_new(a, b);
        }
    }
    else {
        return rb_num_coerce_bin(x, y, rb_intern("divmod"));
    }
}

even? → true or false click to toggle source

Returns true if fix is an even number.

static VALUE
fix_even_p(VALUE num)
{
    if (num & 2) {
        return Qfalse;
    }
    return Qtrue;
}

fdiv(numeric) → float click to toggle source

Returns the floating point result of dividing fix by numeric.

654321.fdiv(13731)      #=> 47.6528293642124
654321.fdiv(13731.24)   #=> 47.6519964693647

static VALUE
fix_fdiv(VALUE x, VALUE y)
{
    if (FIXNUM_P(y)) {
        return DBL2NUM((double)FIX2LONG(x) / (double)FIX2LONG(y));
    }
    else if (RB_TYPE_P(y, T_BIGNUM)) {
        return rb_big_fdiv(rb_int2big(FIX2LONG(x)), y);
    }
    else if (RB_TYPE_P(y, T_FLOAT)) {
        return DBL2NUM((double)FIX2LONG(x) / RFLOAT_VALUE(y));
    }
    else {
        return rb_num_coerce_bin(x, y, rb_intern("fdiv"));
    }
}

inspect(p1 = v1) click to toggle source

Alias for: to_s

abs → integer click to toggle source

magnitude → integer

Returns the absolute value of fix.

-12345.abs   #=> 12345
12345.abs    #=> 12345

static VALUE
fix_abs(VALUE fix)
{
    long i = FIX2LONG(fix);

    if (i < 0) i = -i;

    return LONG2NUM(i);
}

fix % other → real click to toggle source

modulo(other) → real

Returns fix modulo other.

See Numeric#divmod for more information.

static VALUE
fix_mod(VALUE x, VALUE y)
{
    if (FIXNUM_P(y)) {
        long mod;

        fixdivmod(FIX2LONG(x), FIX2LONG(y), 0, &mod);
        return LONG2NUM(mod);
    }
    else if (RB_TYPE_P(y, T_BIGNUM)) {
        x = rb_int2big(FIX2LONG(x));
        return rb_big_modulo(x, y);
    }
    else if (RB_TYPE_P(y, T_FLOAT)) {
        return DBL2NUM(ruby_float_mod((double)FIX2LONG(x), RFLOAT_VALUE(y)));
    }
    else {
        return rb_num_coerce_bin(x, y, '%');
    }
}

odd? → true or false click to toggle source

Returns true if fix is an odd number.

static VALUE
fix_odd_p(VALUE num)
{
    if (num & 2) {
        return Qtrue;
    }
    return Qfalse;
}

size → fixnum click to toggle source

Returns the number of bytes in the machine representation of fix.

1.size            #=> 4
-1.size           #=> 4
2147483647.size   #=> 4

static VALUE
fix_size(VALUE fix)
{
    return INT2FIX(sizeof(long));
}

next → integer click to toggle source

succ → integer

Returns the Integer equal to int + 1.

1.next      #=> 2
(-1).next   #=> 0

static VALUE
fix_succ(VALUE num)
{
    long i = FIX2LONG(num) + 1;
    return LONG2NUM(i);
}

to_f → float click to toggle source

Converts fix to a Float.

static VALUE
fix_to_f(VALUE num)
{
    double val;

    val = (double)FIX2LONG(num);

    return DBL2NUM(val);
}

to_s(base=10) → string click to toggle source

Returns a string containing the representation of fix radix base (between 2 and 36).

12345.to_s       #=> "12345"
12345.to_s(2)    #=> "11000000111001"
12345.to_s(8)    #=> "30071"
12345.to_s(10)   #=> "12345"
12345.to_s(16)   #=> "3039"
12345.to_s(36)   #=> "9ix"

static VALUE
fix_to_s(int argc, VALUE *argv, VALUE x)
{
    int base;

    if (argc == 0) base = 10;
    else {
        VALUE b;

        rb_scan_args(argc, argv, "01", &b);
        base = NUM2INT(b);
    }

    return rb_fix2str(x, base);
}

Also aliased as: inspect

zero? → true or false click to toggle source

Returns true if fix is zero.

static VALUE
fix_zero_p(VALUE num)
{
    if (FIX2LONG(num) == 0) {
        return Qtrue;
    }
    return Qfalse;
}

fix | integer → integer_result click to toggle source

Bitwise OR.

static VALUE
fix_or(VALUE x, VALUE y)
{
    if (FIXNUM_P(y)) {
        long val = FIX2LONG(x) | FIX2LONG(y);
        return LONG2NUM(val);
    }

    if (RB_TYPE_P(y, T_BIGNUM)) {
        return rb_big_or(y, x);
    }

    bit_coerce(&x, &y);
    return rb_funcall(x, rb_intern("|"), 1, y);
}

~fix → integer click to toggle source

One's complement: returns a number where each bit is flipped.

static VALUE
fix_rev(VALUE num)
{
    return ~num | FIXNUM_FLAG;
}

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