added patch for overloading constants, made PERL_OBJECT-aware

[p5sagit/p5-mst-13.2.git] / lib / Math / BigInt.pm

diff --git a/lib/Math/BigInt.pm b/lib/Math/BigInt.pm
index 422dca4..bbd15e4 100644 (file)
--- a/lib/Math/BigInt.pm
+++ b/lib/Math/BigInt.pm
@@ -36,6 +36,12 @@ sub stringify { "${$_[0]}" }
 sub numify { 0 + "${$_[0]}" }  # Not needed, additional overhead
                                # comparing to direct compilation based on
                                # stringify
+sub import {
+  shift;
+  return unless @_;
+  die "unknown import: @_" unless @_ == 1 and $_[0] eq ':constant';
+  overload::constant integer => sub {Math::BigInt->new(shift)};
+}
 
 $zero = 0;
 
@@ -171,7 +177,7 @@ sub add { #(int_num_array, int_num_array) return int_num_array
     $car = 0;
     for $x (@x) {
        last unless @y || $car;
-       $x -= 1e5 if $car = (($x += shift(@y) + $car) >= 1e5) ? 1 : 0;
+       $x -= 1e5 if $car = (($x += (@y ? shift(@y) : 0) + $car) >= 1e5) ? 1 : 0;
     }
     for $y (@y) {
        last unless $car;
@@ -185,8 +191,8 @@ sub sub { #(int_num_array, int_num_array) return int_num_array
     local(*sx, *sy) = @_;
     $bar = 0;
     for $sx (@sx) {
-       last unless @y || $bar;
-       $sx += 1e5 if $bar = (($sx -= shift(@sy) + $bar) < 0);
+       last unless @sy || $bar;
+       $sx += 1e5 if $bar = (($sx -= (@sy ? shift(@sy) : 0) + $bar) < 0);
     }
     @sx;
 }
@@ -384,6 +390,19 @@ are not numbers, as well as the result of dividing by zero.
    '1 23 456 7890'                 canonical value '+1234567890'
 
 
+=head1 Autocreating constants
+
+After C<use Math::BigInt ':constant'> all the integer decimal constants
+in the given scope are converted to C<Math::BigInt>.  This convertion
+happens at compile time.
+
+In particular
+
+  perl -MMath::BigInt=:constant -e 'print 2**100'
+
+print the integer value of C<2**100>.  Note that without convertion of 
+constants the expression 2**100 will be calculatted as floating point number.
+
 =head1 BUGS
 
 The current version of this module is a preliminary version of the