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fixed: template Big::FromBig(const Big<another_exp, another_man> & another) 

didn't correctly set the exponent (when the mantisses had different size -
       when 'man' was different from 'another_man')
       this had impact on operator= too
       sample:
       Big<2,3> a = 100;
       Big<3,5> b;
       b = a; // b had a wrong value


git-svn-id: svn://ttmath.org/publicrep/ttmath/trunk@106 e52654a7-88a9-db11-a3e9-0013d4bc506e
This commit is contained in:
Tomasz Sowa 2009-03-24 20:34:33 +00:00
parent 460608859c
commit 3899b8631c
2 changed files with 27 additions and 5 deletions
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2
COPYRIGHT
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@ -1,4 +1,4 @@
Copyright (c) 2006-2008, Tomasz Sowa Copyright (c) 2006-2009, Tomasz Sowa
All rights reserved. All rights reserved.
Redistribution and use in source and binary forms, with or without Redistribution and use in source and binary forms, with or without

28
ttmath/ttmathbig.h
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@ -1630,6 +1630,7 @@ public:
uint man_len_min = (man < another_man)? man : another_man; uint man_len_min = (man < another_man)? man : another_man;
uint i; uint i;
uint c = 0;
for( i = 0 ; i<man_len_min ; ++i ) for( i = 0 ; i<man_len_min ; ++i )
mantissa.table[man-1-i] = another.mantissa.table[another_man-1-i]; mantissa.table[man-1-i] = another.mantissa.table[another_man-1-i];
@ -1637,10 +1638,31 @@ public:
for( ; i<man ; ++i ) for( ; i<man ; ++i )
mantissa.table[man-1-i] = 0; mantissa.table[man-1-i] = 0;
// mantissa is standardized
//c += Standardizing();
return 0; // MS Visual Express 2005 reports a warning (in the lines with 'uint man_diff = ...'):
// warning C4307: '*' : integral constant overflow
// but we're using 'if( man > another_man )' and 'if( man < another_man )' and there'll be no such a situation here
#pragma warning( disable: 4307 )
if( man > another_man )
{
uint man_diff = (man - another_man) * TTMATH_BITS_PER_UINT;
c += exponent.SubInt(man_diff, 0);
}
else
if( man < another_man )
{
uint man_diff = (another_man - man) * TTMATH_BITS_PER_UINT;
c += exponent.AddInt(man_diff, 0);
}
#pragma warning( default: 4307 )
// mantissa doesn't have to be standardized (either the highest bit is set or all bits are equal zero)
CorrectZero();
return (c == 0 )? 0 : 1;
} }