my $class = "Math::BigInt";
require 5.005;
-$VERSION = '1.68';
+$VERSION = '1.72';
use Exporter;
@ISA = qw( Exporter );
@EXPORT_OK = qw( objectify bgcd blcm);
my $CALC = 'Math::BigInt::Calc'; # module to do the low level math
# default is Calc.pm
-my %CAN; # cache for $CALC->can(...)
my $IMPORT = 0; # was import() called yet?
# used to make require work
-
+my %WARN; # warn only once for low-level libs
+my %CAN; # cache for $CALC->can(...)
my $EMU_LIB = 'Math/BigInt/CalcEmu.pm'; # emulate low-level math
-my $EMU = 'Math::BigInt::CalcEmu'; # emulate low-level math
##############################################################################
# the old code had $rnd_mode, so we need to support it, too
if (ref($x))
{
# $object->accuracy() or fallback to global
- $x->bround($a) if $a; # not for undef, 0
- $x->{_a} = $a; # set/overwrite, even if not rounded
- $x->{_p} = undef; # clear P
+ $x->bround($a) if $a; # not for undef, 0
+ $x->{_a} = $a; # set/overwrite, even if not rounded
+ delete $x->{_p}; # clear P
$a = ${"${class}::accuracy"} unless defined $a; # proper return value
}
else
{
- # set global
- ${"${class}::accuracy"} = $a;
- ${"${class}::precision"} = undef; # clear P
+ ${"${class}::accuracy"} = $a; # set global A
+ ${"${class}::precision"} = undef; # clear global P
}
- return $a; # shortcut
+ return $a; # shortcut
}
my $r;
if (ref($x))
{
# $object->precision() or fallback to global
- $x->bfround($p) if $p; # not for undef, 0
- $x->{_p} = $p; # set/overwrite, even if not rounded
- $x->{_a} = undef; # clear A
+ $x->bfround($p) if $p; # not for undef, 0
+ $x->{_p} = $p; # set/overwrite, even if not rounded
+ delete $x->{_a}; # clear A
$p = ${"${class}::precision"} unless defined $p; # proper return value
}
else
{
- # set global
- ${"${class}::precision"} = $p;
- ${"${class}::accuracy"} = undef; # clear A
+ ${"${class}::precision"} = $p; # set global P
+ ${"${class}::accuracy"} = undef; # clear global A
}
- return $p; # shortcut
+ return $p; # shortcut
}
my $r;
return unless ref($x); # only for objects
my $self = {}; bless $self,$c;
- my $r;
- foreach my $k (keys %$x)
- {
- if ($k eq 'value')
- {
- $self->{value} = $CALC->_copy($x->{value}); next;
- }
- if (!($r = ref($x->{$k})))
- {
- $self->{$k} = $x->{$k}; next;
- }
- if ($r eq 'SCALAR')
- {
- $self->{$k} = \${$x->{$k}};
- }
- elsif ($r eq 'ARRAY')
- {
- $self->{$k} = [ @{$x->{$k}} ];
- }
- elsif ($r eq 'HASH')
- {
- # only one level deep!
- foreach my $h (keys %{$x->{$k}})
- {
- $self->{$k}->{$h} = $x->{$k}->{$h};
- }
- }
- else # normal ref
- {
- my $xk = $x->{$k};
- if ($xk->can('copy'))
- {
- $self->{$k} = $xk->copy();
- }
- else
- {
- $self->{$k} = $xk->new($xk);
- }
- }
- }
+
+ $self->{sign} = $x->{sign};
+ $self->{value} = $CALC->_copy($x->{value});
+ $self->{_a} = $x->{_a} if defined $x->{_a};
+ $self->{_p} = $x->{_p} if defined $x->{_p};
$self;
}
if ((!ref $wanted) && ($wanted =~ /^([+-]?)[1-9][0-9]*\z/))
{
$self->{sign} = $1 || '+';
- my $ref = \$wanted;
+
if ($wanted =~ /^[+-]/)
{
# remove sign without touching wanted to make it work with constants
- my $t = $wanted; $t =~ s/^[+-]//; $ref = \$t;
+ my $t = $wanted; $t =~ s/^[+-]//;
+ $self->{value} = $CALC->_new($t);
+ }
+ else
+ {
+ $self->{value} = $CALC->_new($wanted);
}
- # force to string version (otherwise Pari is unhappy about overflowed
- # constants, for instance)
- # not good, BigInt shouldn't need to know about alternative libs:
- # $ref = \"$$ref" if $CALC eq 'Math::BigInt::Pari';
- $self->{value} = $CALC->_new($ref);
no strict 'refs';
if ( (defined $a) || (defined $p)
|| (defined ${"${class}::precision"})
return $self;
}
# split str in m mantissa, e exponent, i integer, f fraction, v value, s sign
- my ($mis,$miv,$mfv,$es,$ev) = _split(\$wanted);
+ my ($mis,$miv,$mfv,$es,$ev) = _split($wanted);
if (!ref $mis)
{
if ($_trap_nan)
}
}
$self->{sign} = '+' if $$miv eq '0'; # normalize -0 => +0
- $self->{value} = $CALC->_new($miv) if $self->{sign} =~ /^[+-]$/;
+ $self->{value} = $CALC->_new($$miv) if $self->{sign} =~ /^[+-]$/;
# if any of the globals is set, use them to round and store them inside $self
# do not round for new($x,undef,undef) since that is used by MBF to signal
# no rounding
}
$self->{sign} = $nan;
delete $self->{_a}; delete $self->{_p}; # rounding NaN is silly
- return $self;
+ $self;
}
sub binf
$sign = $sign . 'inf' if $sign !~ /inf$/; # - => -inf
$self->{sign} = $sign;
($self->{_a},$self->{_p}) = @_; # take over requested rounding
- return $self;
+ $self;
}
sub bzero
my ($m,$e) = $x->parts();
#$m->bstr() . 'e+' . $e->bstr(); # e can only be positive in BigInt
# 'e+' because E can only be positive in BigInt
- $m->bstr() . 'e+' . ${$CALC->_str($e->{value})};
+ $m->bstr() . 'e+' . $CALC->_str($e->{value});
}
sub bstr
return 'inf'; # +inf
}
my $es = ''; $es = $x->{sign} if $x->{sign} eq '-';
- $es.${$CALC->_str($x->{value})};
+ $es.$CALC->_str($x->{value});
}
sub numify
# handle +-inf and NaN
return undef if (($x->{sign} eq $nan) || ($y->{sign} eq $nan));
return 0 if $x->{sign} =~ /^[+-]inf$/ && $y->{sign} =~ /^[+-]inf$/;
- return +1; # inf is always bigger
+ return 1 if $x->{sign} =~ /^[+-]inf$/ && $y->{sign} !~ /^[+-]inf$/;
+ return -1;
}
$CALC->_acmp($x->{value},$y->{value}); # lib does only 0,1,-1
}
return $x if $x->modify('bsub');
-# upgrade done by badd():
-# return $upgrade->badd($x,$y,@r) if defined $upgrade &&
-# ((!$x->isa($self)) || (!$y->isa($self)));
+ return $upgrade->new($x)->bsub($upgrade->new($y),@r) if defined $upgrade &&
+ ((!$x->isa($self)) || (!$y->isa($self)));
if ($y->is_zero())
{
return $x;
}
+ require Scalar::Util;
+ if (Scalar::Util::refaddr($x) == Scalar::Util::refaddr($y))
+ {
+ # if we get the same variable twice, the result must be zero (the code
+ # below fails in that case)
+ return $x->bzero(@r) if $x->{sign} =~ /^[+-]$/;
+ return $x->bnan(); # NaN, -inf, +inf
+ }
$y->{sign} =~ tr/+\-/-+/; # does nothing for NaN
$x->badd($y,@r); # badd does not leave internal zeros
$y->{sign} =~ tr/+\-/-+/; # refix $y (does nothing for NaN)
# objectify is costly, so avoid it
if ((!ref($_[0])) || (ref($_[0]) ne ref($_[1])))
{
- ($self,$x,$base,@r) = objectify(2,$class,@_);
+ ($self,$x,$base,@r) = objectify(1,$class,@_);
}
+
+ return $x if $x->modify('blog');
# inf, -inf, NaN, <0 => NaN
return $x->bnan()
- if $x->{sign} ne '+' || $base->{sign} ne '+';
-
- return $upgrade->blog($upgrade->new($x),$base,@r) if
- defined $upgrade && (ref($x) ne $upgrade || ref($base) ne $upgrade);
+ if $x->{sign} ne '+' || (defined $base && $base->{sign} ne '+');
- if ($CAN{log_int})
- {
- my ($rc,$exact) = $CALC->_log_int($x->{value},$base->{value});
- return $x->bnan() unless defined $rc;
- $x->{value} = $rc;
- return $x->round(@r);
- }
+ return $upgrade->blog($upgrade->new($x),$base,@r) if
+ defined $upgrade;
- require $EMU_LIB;
- __emu_blog($self,$x,$base,@r);
+ my ($rc,$exact) = $CALC->_log_int($x->{value},$base->{value});
+ return $x->bnan() unless defined $rc; # not possible to take log?
+ $x->{value} = $rc;
+ $x->round(@r);
}
sub blcm
}
else
{
- $x = $class->new($y);
+ $x = __PACKAGE__->new($y);
}
- while (@_) { $x = __lcm($x,shift); }
+ my $self = ref($x);
+ while (@_)
+ {
+ my $y = shift; $y = $self->new($y) if !ref ($y);
+ $x = __lcm($x,$y);
+ }
$x;
}
my $y = shift;
$y = __PACKAGE__->new($y) if !ref($y);
my $self = ref($y);
- my $x = $y->copy(); # keep arguments
- if ($CAN{gcd})
+ my $x = $y->copy()->babs(); # keep arguments
+ return $x->bnan() if $x->{sign} !~ /^[+-]$/; # x NaN?
+
+ while (@_)
{
- while (@_)
- {
- $y = shift; $y = $self->new($y) if !ref($y);
- next if $y->is_zero();
- return $x->bnan() if $y->{sign} !~ /^[+-]$/; # y NaN?
- $x->{value} = $CALC->_gcd($x->{value},$y->{value}); last if $x->is_one();
- }
+ $y = shift; $y = $self->new($y) if !ref($y);
+ next if $y->is_zero();
+ return $x->bnan() if $y->{sign} !~ /^[+-]$/; # y NaN?
+ $x->{value} = $CALC->_gcd($x->{value},$y->{value}); last if $x->is_one();
}
- else
- {
- while (@_)
- {
- $y = shift; $y = $self->new($y) if !ref($y);
- $x = __gcd($x,$y->copy()); last if $x->is_one(); # _gcd handles NaN
- }
- }
- $x->babs();
+ $x;
}
sub bnot
return $x->binf() if ($x->{sign} =~ /^-/ && $y->{sign} =~ /^-/);
return $x->binf('-');
}
-
- return $upgrade->bmul($x,$y,@r)
- if defined $upgrade && $y->isa($upgrade);
+
+ return $upgrade->bmul($x,$upgrade->new($y),@r)
+ if defined $upgrade && !$y->isa($self);
$r[3] = $y; # no push here
return $x->round(@r);
}
- if ($CAN{mod})
+ # calc new sign and in case $y == +/- 1, return $x
+ $x->{value} = $CALC->_mod($x->{value},$y->{value});
+ if (!$CALC->_is_zero($x->{value}))
{
- # calc new sign and in case $y == +/- 1, return $x
- $x->{value} = $CALC->_mod($x->{value},$y->{value});
- if (!$CALC->_is_zero($x->{value}))
- {
- my $xsign = $x->{sign};
- $x->{sign} = $y->{sign};
- if ($xsign ne $y->{sign})
- {
- my $t = $CALC->_copy($x->{value}); # copy $x
- $x->{value} = $CALC->_sub($y->{value},$t,1); # $y-$x
- }
- }
- else
+ my $xsign = $x->{sign};
+ $x->{sign} = $y->{sign};
+ if ($xsign ne $y->{sign})
{
- $x->{sign} = '+'; # dont leave -0
+ my $t = $CALC->_copy($x->{value}); # copy $x
+ $x->{value} = $CALC->_sub($y->{value},$t,1); # $y-$x
}
- $x->round(@r) if !exists $x->{_f} || $x->{_f} & MB_NEVER_ROUND == 0;
- return $x;
}
- # disable upgrade temporarily, otherwise endless loop due to bdiv()
- local $upgrade = undef;
- my ($t,$rem) = $self->bdiv($x->copy(),$y,@r); # slow way (also rounds)
- # modify in place
- foreach (qw/value sign _a _p/)
+ else
{
- $x->{$_} = $rem->{$_};
+ $x->{sign} = '+'; # dont leave -0
}
+ $x->round(@r) if !exists $x->{_f} || $x->{_f} & MB_NEVER_ROUND == 0;
$x;
}
# put least residue into $x if $x was negative, and thus make it positive
$x->bmod($y) if $x->{sign} eq '-';
- if ($CAN{modinv})
- {
- my $sign;
- ($x->{value},$sign) = $CALC->_modinv($x->{value},$y->{value});
- return $x->bnan() if !defined $x->{value}; # in case no GCD found
- return $x if !defined $sign; # already real result
- $x->{sign} = $sign; # flip/flop see below
- $x->bmod($y); # calc real result
- return $x;
- }
-
- require $EMU_LIB;
- __emu_bmodinv($self,$x,$y,@r);
+ my $sign;
+ ($x->{value},$sign) = $CALC->_modinv($x->{value},$y->{value});
+ return $x->bnan() if !defined $x->{value}; # in case no GCD found
+ return $x if !defined $sign; # already real result
+ $x->{sign} = $sign; # flip/flop see below
+ $x->bmod($y); # calc real result
+ $x;
}
sub bmodpow
# check num for valid values (also NaN if there was no inverse but $exp < 0)
return $num->bnan() if $num->{sign} !~ /^[+-]$/;
- if ($CAN{modpow})
- {
- # $mod is positive, sign on $exp is ignored, result also positive
- $num->{value} = $CALC->_modpow($num->{value},$exp->{value},$mod->{value});
- return $num;
- }
-
- require $EMU_LIB;
- __emu_bmodpow($self,$num,$exp,$mod,@r);
+ # $mod is positive, sign on $exp is ignored, result also positive
+ $num->{value} = $CALC->_modpow($num->{value},$exp->{value},$mod->{value});
+ $num;
}
###############################################################################
return $x if $x->{sign} eq '+inf'; # inf => inf
return $x->bnan() if $x->{sign} ne '+'; # NaN, <0 etc => NaN
- if ($CAN{fac})
- {
- $x->{value} = $CALC->_fac($x->{value});
- return $x->round(@r);
- }
-
- require $EMU_LIB;
- __emu_bfac($self,$x,@r);
+ $x->{value} = $CALC->_fac($x->{value});
+ $x->round(@r);
}
sub bpow
# cases 0 ** Y, X ** 0, X ** 1, 1 ** Y are handled by Calc or Emu
- if ($x->{sign} eq '-' && $CALC->_is_one($x->{value}))
- {
- # if $x == -1 and odd/even y => +1/-1
- return $y->is_odd() ? $x->round(@r) : $x->babs()->round(@r);
- # my Casio FX-5500L has a bug here: -1 ** 2 is -1, but -1 * -1 is 1;
- }
+ my $new_sign = '+';
+ $new_sign = $y->is_odd() ? '-' : '+' if ($x->{sign} ne '+');
+
+ # 0 ** -7 => ( 1 / (0 ** 7)) => 1 / 0 => +inf
+ return $x->binf()
+ if $y->{sign} eq '-' && $x->{sign} eq '+' && $CALC->_is_zero($x->{value});
# 1 ** -y => 1 / (1 ** |y|)
# so do test for negative $y after above's clause
- return $x->bnan() if $y->{sign} eq '-' && !$x->is_one();
+ return $x->bnan() if $y->{sign} eq '-' && !$CALC->_is_one($x->{value});
- if ($CAN{pow})
- {
- $x->{value} = $CALC->_pow($x->{value},$y->{value});
- $x->{sign} = '+' if $CALC->_is_zero($y->{value});
- $x->round(@r) if !exists $x->{_f} || $x->{_f} & MB_NEVER_ROUND == 0;
- return $x;
- }
-
- require $EMU_LIB;
- __emu_bpow($self,$x,$y,@r);
+ $x->{value} = $CALC->_pow($x->{value},$y->{value});
+ $x->{sign} = $new_sign;
+ $x->{sign} = '+' if $CALC->_is_zero($y->{value});
+ $x->round(@r) if !exists $x->{_f} || $x->{_f} & MB_NEVER_ROUND == 0;
+ $x;
}
sub blsft
$n = 2 if !defined $n; return $x->bnan() if $n <= 0 || $y->{sign} eq '-';
- my $t; $t = $CALC->_lsft($x->{value},$y->{value},$n) if $CAN{lsft};
- if (defined $t)
- {
- $x->{value} = $t; return $x->round(@r);
- }
- # fallback
- $x->bmul( $self->bpow($n, $y, @r), @r );
+ $x->{value} = $CALC->_lsft($x->{value},$y->{value},$n);
+ $x->round(@r);
}
sub brsft
$x->bdec(); # n == 2, but $y == 1: this fixes it
}
- my $t; $t = $CALC->_rsft($x->{value},$y->{value},$n) if $CAN{rsft};
- if (defined $t)
- {
- $x->{value} = $t;
- return $x->round(@r);
- }
- # fallback
- $x->bdiv($self->bpow($n,$y, @r), @r);
- $x;
+ $x->{value} = $CALC->_rsft($x->{value},$y->{value},$n);
+ $x->round(@r);
}
sub band
my $sx = $x->{sign} eq '+' ? 1 : -1;
my $sy = $y->{sign} eq '+' ? 1 : -1;
- if ($CAN{and} && $sx == 1 && $sy == 1)
+ if ($sx == 1 && $sy == 1)
{
$x->{value} = $CALC->_and($x->{value},$y->{value});
return $x->round(@r);
return $x if $x->modify('bior');
$r[3] = $y; # no push!
- local $Math::BigInt::upgrade = undef;
-
return $x->bnan() if ($x->{sign} !~ /^[+-]$/ || $y->{sign} !~ /^[+-]$/);
my $sx = $x->{sign} eq '+' ? 1 : -1;
# the sign of X follows the sign of X, e.g. sign of Y irrelevant for bior()
# don't use lib for negative values
- if ($CAN{or} && $sx == 1 && $sy == 1)
+ if ($sx == 1 && $sy == 1)
{
$x->{value} = $CALC->_or($x->{value},$y->{value});
return $x->round(@r);
my $sy = $y->{sign} eq '+' ? 1 : -1;
# don't use lib for negative values
- if ($CAN{xor} && $sx == 1 && $sy == 1)
+ if ($sx == 1 && $sy == 1)
{
$x->{value} = $CALC->_xor($x->{value},$y->{value});
return $x->round(@r);
sub digit
{
# return the nth decimal digit, negative values count backward, 0 is right
- my ($self,$x,$n) = ref($_[0]) ? (ref($_[0]),@_) : objectify(1,@_);
+ my ($self,$x,$n) = ref($_[0]) ? (undef,@_) : objectify(1,@_);
+ $n = $n->numify() if ref($n);
$CALC->_digit($x->{value},$n||0);
}
my $x = shift;
$x = $class->new($x) unless ref $x;
- return 0 if $x->is_zero() || $x->is_odd() || $x->{sign} !~ /^[+-]$/;
+ return 0 if $x->{sign} !~ /^[+-]$/; # NaN, inf, -inf etc
- return $CALC->_zeros($x->{value}) if $CAN{zeros};
-
- # if not: since we do not know underlying internal representation:
- my $es = "$x"; $es =~ /([0]*)$/;
- return 0 if !defined $1; # no zeros
- CORE::length("$1"); # as string, not as +0!
+ $CALC->_zeros($x->{value}); # must handle odd values, 0 etc
}
sub bsqrt
return $upgrade->bsqrt($x,@r) if defined $upgrade;
- if ($CAN{sqrt})
- {
- $x->{value} = $CALC->_sqrt($x->{value});
- return $x->round(@r);
- }
-
- require $EMU_LIB;
- __emu_bsqrt($self,$x,@r);
+ $x->{value} = $CALC->_sqrt($x->{value});
+ $x->round(@r);
}
sub broot
return $upgrade->new($x)->broot($upgrade->new($y),@r) if defined $upgrade;
- if ($CAN{root})
- {
- $x->{value} = $CALC->_root($x->{value},$y->{value});
- return $x->round(@r);
- }
-
- require $EMU_LIB;
- __emu_broot($self,$x,$y,@r);
+ $x->{value} = $CALC->_root($x->{value},$y->{value});
+ $x->round(@r);
}
sub exponent
{
# precision: round to the $Nth digit left (+$n) or right (-$n) from the '.'
# $n == 0 || $n == 1 => round to integer
- my $x = shift; $x = $class->new($x) unless ref $x;
+ my $x = shift; my $self = ref($x) || $x; $x = $self->new($x) unless ref $x;
my ($scale,$mode) = $x->_scale_p($x->precision(),$x->round_mode(),@_);
# no-op for BigInts if $n <= 0
$x->bround( $x->length()-$scale, $mode) if $scale > 0;
- $x->{_a} = undef; # bround sets {_a}
- $x->{_p} = $scale; # so correct it
+ delete $x->{_a}; # delete to save memory
+ $x->{_p} = $scale; # store new _p
$x;
}
sub _scan_for_nonzero
{
- # internal, used by bround()
- my ($x,$pad,$xs) = @_;
+ # internal, used by bround() to scan for non-zeros after a '5'
+ my ($x,$pad,$xs,$len) = @_;
- my $len = $x->length();
- return 0 if $len == 1; # '5' is trailed by invisible zeros
+ return 0 if $len == 1; # "5" is trailed by invisible zeros
my $follow = $pad - 1;
return 0 if $follow > $len || $follow < 1;
- # since we do not know underlying represention of $x, use decimal string
- my $r = substr ("$x",-$follow);
- $r =~ /[^0]/ ? 1 : 0;
+ # use the string form to check whether only '0's follow or not
+ substr ($xs,-$follow) =~ /[^0]/ ? 1 : 0;
}
sub fround
$pad = $len - $scale;
$pad = abs($scale-1) if $scale < 0;
- # do not use digit(), it is costly for binary => decimal
-
+ # do not use digit(), it is very costly for binary => decimal
+ # getting the entire string is also costly, but we need to do it only once
my $xs = $CALC->_str($x->{value});
my $pl = -$pad-1;
# pad: 123: 0 => -1, at 1 => -2, at 2 => -3, at 3 => -4
# pad+1: 123: 0 => 0, at 1 => -1, at 2 => -2, at 3 => -3
- $digit_round = '0'; $digit_round = substr($$xs,$pl,1) if $pad <= $len;
+ $digit_round = '0'; $digit_round = substr($xs,$pl,1) if $pad <= $len;
$pl++; $pl ++ if $pad >= $len;
- $digit_after = '0'; $digit_after = substr($$xs,$pl,1) if $pad > 0;
+ $digit_after = '0'; $digit_after = substr($xs,$pl,1) if $pad > 0;
# in case of 01234 we round down, for 6789 up, and only in case 5 we look
# closer at the remaining digits of the original $x, remember decision
($digit_after =~ /[01234]/) || # round down anyway,
# 6789 => round up
($digit_after eq '5') && # not 5000...0000
- ($x->_scan_for_nonzero($pad,$xs) == 0) &&
+ ($x->_scan_for_nonzero($pad,$xs,$len) == 0) &&
(
($mode eq 'even') && ($digit_round =~ /[24680]/) ||
($mode eq 'odd') && ($digit_round =~ /[13579]/) ||
if (($pad > 0) && ($pad <= $len))
{
- substr($$xs,-$pad,$pad) = '0' x $pad;
- $put_back = 1;
+ substr($xs,-$pad,$pad) = '0' x $pad; # replace with '00...'
+ $put_back = 1; # need to put back
}
elsif ($pad > $len)
{
if ($round_up) # what gave test above?
{
- $put_back = 1;
- $pad = $len, $$xs = '0' x $pad if $scale < 0; # tlr: whack 0.51=>1.0
+ $put_back = 1; # need to put back
+ $pad = $len, $xs = '0' x $pad if $scale < 0; # tlr: whack 0.51=>1.0
# we modify directly the string variant instead of creating a number and
# adding it, since that is faster (we already have the string)
my $c = 0; $pad ++; # for $pad == $len case
while ($pad <= $len)
{
- $c = substr($$xs,-$pad,1) + 1; $c = '0' if $c eq '10';
- substr($$xs,-$pad,1) = $c; $pad++;
+ $c = substr($xs,-$pad,1) + 1; $c = '0' if $c eq '10';
+ substr($xs,-$pad,1) = $c; $pad++;
last if $c != 0; # no overflow => early out
}
- $$xs = '1'.$$xs if $c == 0;
+ $xs = '1'.$xs if $c == 0;
}
- $x->{value} = $CALC->_new($xs) if $put_back == 1; # put back in if needed
+ $x->{value} = $CALC->_new($xs) if $put_back == 1; # put back, if needed
$x->{_a} = $scale if $scale >= 0;
if ($scale < 0)
my $s = '';
$s = $x->{sign} if $x->{sign} eq '-';
- if ($CAN{as_hex})
- {
- return $s . ${$CALC->_as_hex($x->{value})};
- }
-
- require $EMU_LIB;
- __emu_as_hex(ref($x),$x,$s);
+ $s . $CALC->_as_hex($x->{value});
}
sub as_bin
return $x->bstr() if $x->{sign} !~ /^[+-]$/; # inf, nan etc
my $s = ''; $s = $x->{sign} if $x->{sign} eq '-';
- if ($CAN{as_bin})
- {
- return $s . ${$CALC->_as_bin($x->{value})};
- }
-
- require $EMU_LIB;
- __emu_as_bin(ref($x),$x,$s);
-
+ return $s . $CALC->_as_bin($x->{value});
}
##############################################################################
{
eval "use $lib qw/@c/;";
}
- $CALC = $lib, last if $@ eq ''; # no error in loading lib?
+ if ($@ eq '')
+ {
+ my $ok = 1;
+ # loaded it ok, see if the api_version() is high enough
+ if ($lib->can('api_version') && $lib->api_version() >= 1.0)
+ {
+ $ok = 0;
+ # api_version matches, check if it really provides anything we need
+ for my $method (qw/
+ one two ten
+ str num
+ add mul div sub dec inc
+ acmp len digit is_one is_zero is_even is_odd
+ is_two is_ten
+ new copy check from_hex from_bin as_hex as_bin zeros
+ rsft lsft xor and or
+ mod sqrt root fac pow modinv modpow log_int gcd
+ /)
+ {
+ if (!$lib->can("_$method"))
+ {
+ if (($WARN{$lib}||0) < 2)
+ {
+ require Carp;
+ Carp::carp ("$lib is missing method '_$method'");
+ $WARN{$lib} = 1; # still warn about the lib
+ }
+ $ok++; last;
+ }
+ }
+ }
+ if ($ok == 0)
+ {
+ $CALC = $lib;
+ last; # found a usable one, break
+ }
+ else
+ {
+ if (($WARN{$lib}||0) < 2)
+ {
+ my $ver = eval "\$$lib\::VERSION";
+ require Carp;
+ Carp::carp ("Cannot load outdated $lib v$ver, please upgrade");
+ $WARN{$lib} = 2; # never warn again
+ }
+ }
+ }
}
if ($CALC eq '')
{
require Carp;
Carp::croak ("Couldn't load any math lib, not even 'Calc.pm'");
}
- _fill_can_cache();
+ _fill_can_cache(); # for emulating lower math lib functions
}
sub _fill_can_cache
# fill $CAN with the results of $CALC->can(...)
%CAN = ();
- for my $method (qw/gcd mod modinv modpow fac pow lsft rsft
- and signed_and or signed_or xor signed_xor
- from_hex as_hex from_bin as_bin
- zeros sqrt root log_int log
- /)
+ for my $method (qw/ signed_and or signed_or xor signed_xor /)
{
$CAN{$method} = $CALC->can("_$method") ? 1 : 0;
}
my $x = Math::BigInt->bzero();
# strip underscores
- $$hs =~ s/([0-9a-fA-F])_([0-9a-fA-F])/$1$2/g;
- $$hs =~ s/([0-9a-fA-F])_([0-9a-fA-F])/$1$2/g;
+ $hs =~ s/([0-9a-fA-F])_([0-9a-fA-F])/$1$2/g;
+ $hs =~ s/([0-9a-fA-F])_([0-9a-fA-F])/$1$2/g;
- return $x->bnan() if $$hs !~ /^[\-\+]?0x[0-9A-Fa-f]+$/;
+ return $x->bnan() if $hs !~ /^[\-\+]?0x[0-9A-Fa-f]+$/;
- my $sign = '+'; $sign = '-' if ($$hs =~ /^-/);
+ my $sign = '+'; $sign = '-' if $hs =~ /^-/;
- $$hs =~ s/^[+-]//; # strip sign
- if ($CAN{'from_hex'})
- {
- $x->{value} = $CALC->_from_hex($hs);
- }
- else
- {
- # fallback to pure perl
- my $mul = Math::BigInt->bone();
- my $x65536 = Math::BigInt->new(65536);
- my $len = CORE::length($$hs)-2; # minus 2 for 0x
- $len = int($len/4); # 4-digit parts, w/o '0x'
- my $val; my $i = -4;
- while ($len >= 0)
- {
- $val = substr($$hs,$i,4);
- $val =~ s/^[+-]?0x// if $len == 0; # for last part only because
- $val = hex($val); # hex does not like wrong chars
- $i -= 4; $len --;
- $x += $mul * $val if $val != 0;
- $mul *= $x65536 if $len >= 0; # skip last mul
- }
- }
+ $hs =~ s/^[+-]//; # strip sign
+ $x->{value} = $CALC->_from_hex($hs);
$x->{sign} = $sign unless $CALC->_is_zero($x->{value}); # no '-0'
$x;
}
my $x = Math::BigInt->bzero();
# strip underscores
- $$bs =~ s/([01])_([01])/$1$2/g;
- $$bs =~ s/([01])_([01])/$1$2/g;
- return $x->bnan() if $$bs !~ /^[+-]?0b[01]+$/;
+ $bs =~ s/([01])_([01])/$1$2/g;
+ $bs =~ s/([01])_([01])/$1$2/g;
+ return $x->bnan() if $bs !~ /^[+-]?0b[01]+$/;
- my $sign = '+'; $sign = '-' if ($$bs =~ /^\-/);
- $$bs =~ s/^[+-]//; # strip sign
- if ($CAN{'from_bin'})
- {
- $x->{value} = $CALC->_from_bin($bs);
- }
- else
- {
- my $mul = Math::BigInt->bone();
- my $x256 = Math::BigInt->new(256);
- my $len = CORE::length($$bs)-2; # minus 2 for 0b
- $len = int($len/8); # 8-digit parts, w/o '0b'
- my $val; my $i = -8;
- while ($len >= 0)
- {
- $val = substr($$bs,$i,8);
- $val =~ s/^[+-]?0b// if $len == 0; # for last part only
- #$val = oct('0b'.$val); # does not work on Perl prior to 5.6.0
- # slower:
- # $val = ('0' x (8-CORE::length($val))).$val if CORE::length($val) < 8;
- $val = ord(pack('B8',substr('00000000'.$val,-8,8)));
- $i -= 8; $len --;
- $x += $mul * $val if $val != 0;
- $mul *= $x256 if $len >= 0; # skip last mul
- }
- }
+ my $sign = '+'; $sign = '-' if $bs =~ /^\-/;
+ $bs =~ s/^[+-]//; # strip sign
+
+ $x->{value} = $CALC->_from_bin($bs);
$x->{sign} = $sign unless $CALC->_is_zero($x->{value}); # no '-0'
$x;
}
my $x = shift;
# strip white space at front, also extranous leading zeros
- $$x =~ s/^\s*([-]?)0*([0-9])/$1$2/g; # will not strip ' .2'
- $$x =~ s/^\s+//; # but this will
- $$x =~ s/\s+$//g; # strip white space at end
+ $x =~ s/^\s*([-]?)0*([0-9])/$1$2/g; # will not strip ' .2'
+ $x =~ s/^\s+//; # but this will
+ $x =~ s/\s+$//g; # strip white space at end
# shortcut, if nothing to split, return early
- if ($$x =~ /^[+-]?\d+\z/)
+ if ($x =~ /^[+-]?\d+\z/)
{
- $$x =~ s/^([+-])0*([0-9])/$2/; my $sign = $1 || '+';
- return (\$sign, $x, \'', \'', \0);
+ $x =~ s/^([+-])0*([0-9])/$2/; my $sign = $1 || '+';
+ return (\$sign, \$x, \'', \'', \0);
}
# invalid starting char?
- return if $$x !~ /^[+-]?(\.?[0-9]|0b[0-1]|0x[0-9a-fA-F])/;
+ return if $x !~ /^[+-]?(\.?[0-9]|0b[0-1]|0x[0-9a-fA-F])/;
- return __from_hex($x) if $$x =~ /^[\-\+]?0x/; # hex string
- return __from_bin($x) if $$x =~ /^[\-\+]?0b/; # binary string
+ return __from_hex($x) if $x =~ /^[\-\+]?0x/; # hex string
+ return __from_bin($x) if $x =~ /^[\-\+]?0b/; # binary string
# strip underscores between digits
- $$x =~ s/(\d)_(\d)/$1$2/g;
- $$x =~ s/(\d)_(\d)/$1$2/g; # do twice for 1_2_3
+ $x =~ s/(\d)_(\d)/$1$2/g;
+ $x =~ s/(\d)_(\d)/$1$2/g; # do twice for 1_2_3
# some possible inputs:
# 2.1234 # 0.12 # 1 # 1E1 # 2.134E1 # 434E-10 # 1.02009E-2
# .2 # 1_2_3.4_5_6 # 1.4E1_2_3 # 1e3 # +.2 # 0e999
- #return if $$x =~ /[Ee].*[Ee]/; # more than one E => error
-
- my ($m,$e,$last) = split /[Ee]/,$$x;
+ my ($m,$e,$last) = split /[Ee]/,$x;
return if defined $last; # last defined => 1e2E3 or others
$e = '0' if !defined $e || $e eq "";
my $x = shift; my $ty = shift;
return $x->bnan() if ($x->{sign} eq $nan) || ($ty->{sign} eq $nan);
- return $x * $ty / bgcd($x,$ty);
- }
-
-sub __gcd
- {
- # (BINT or num_str, BINT or num_str) return BINT
- # does modify both arguments
- # GCD -- Euclids algorithm E, Knuth Vol 2 pg 296
- my ($x,$ty) = @_;
-
- return $x->bnan() if $x->{sign} !~ /^[+-]$/ || $ty->{sign} !~ /^[+-]$/;
-
- while (!$ty->is_zero())
- {
- ($x, $ty) = ($ty,bmod($x,$ty));
- }
- $x;
+ $x * $ty / bgcd($x,$ty);
}
###############################################################################
use Math::BigInt lib => 'GMP';
+ my $str = '1234567890';
+ my @values = (64,74,18);
+ my $n = 1; my $sign = '-';
+
# Number creation
$x = Math::BigInt->new($str); # defaults to 0
+ $y = $x->copy(); # make a true copy
$nan = Math::BigInt->bnan(); # create a NotANumber
$zero = Math::BigInt->bzero(); # create a +0
$inf = Math::BigInt->binf(); # create a +inf
$x->is_even(); # if $x is even
$x->is_pos(); # if $x >= 0
$x->is_neg(); # if $x < 0
- $x->is_inf(sign); # if $x is +inf, or -inf (sign is default '+')
+ $x->is_inf($sign); # if $x is +inf, or -inf (sign is default '+')
$x->is_int(); # if $x is an integer (not a float)
# comparing and digit/sign extration
$x->bfac(); # factorial of $x (1*2*3*4*..$x)
$x->round($A,$P,$mode); # round to accuracy or precision using mode $mode
- $x->bround($N); # accuracy: preserve $N digits
- $x->bfround($N); # round to $Nth digit, no-op for BigInts
+ $x->bround($n); # accuracy: preserve $n digits
+ $x->bfround($n); # round to $nth digit, no-op for BigInts
# The following do not modify their arguments in BigInt (are no-ops),
# but do so in BigFloat:
# The following do not modify their arguments:
- bgcd(@values); # greatest common divisor (no OO style)
- blcm(@values); # lowest common multiplicator (no OO style)
+ # greatest common divisor (no OO style)
+ my $gcd = Math::BigInt::bgcd(@values);
+ # lowest common multiplicator (no OO style)
+ my $lcm = Math::BigInt::blcm(@values);
$x->length(); # return number of digits in number
- ($x,$f) = $x->length(); # length of number and length of fraction part,
+ ($xl,$f) = $x->length(); # length of number and length of fraction part,
# latter is always 0 digits long for BigInt's
$x->exponent(); # return exponent as BigInt
=head1 AUTHORS
Original code by Mark Biggar, overloaded interface by Ilya Zakharevich.
-Completely rewritten by Tels http://bloodgate.com in late 2000, 2001, 2002
-and still at it in 2003.
+Completely rewritten by Tels http://bloodgate.com in late 2000, 2001 - 2003
+and still at it in 2004.
Many people contributed in one or more ways to the final beast, see the file
CREDITS for an (uncomplete) list. If you miss your name, please drop me a
projects / p5sagit/p5-mst-13.2.git / blobdiff