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added/fixed: special version of ToString_LogBase() method 

in single thread environment
             the previous version of the method didn't store
             the calculated logarithms


git-svn-id: svn://ttmath.org/publicrep/ttmath/trunk@184 e52654a7-88a9-db11-a3e9-0013d4bc506e
This commit is contained in:
Tomasz Sowa 2009-08-04 18:55:18 +00:00
parent 799e2c32a7
commit 00519ff26d
1 changed files with 37 additions and 0 deletions
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37
ttmath/ttmathbig.h
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@ -47,7 +47,10 @@
#include "ttmaththreads.h"
#include <iostream>
#ifdef TTMATH_MULTITHREADS
#include <signal.h>
#endif
namespace ttmath
{
@ -2980,7 +2983,40 @@ private:
}
#ifndef TTMATH_MULTITHREADS
/*!
this method calculates the logarithm of 'base'
it's used in single thread environment
*/
uint ToString_LogBase(uint base, Big<exp,man> & result)
{
TTMATH_ASSERT( base>=2 && base<=16 )
// this guardians are initialized before the program runs (static POD types)
static int guardians[15] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
static Big<exp,man> log_history[15];
uint index = base - 2;
uint c = 0;
if( guardians[index] == 0 )
{
Big<exp,man> base_(base);
c += log_history[index].Ln(base_);
guardians[index] = 1;
}
result = log_history[index];
return (c==0)? 0 : 1;
}
#else
/*!
this method calculates the logarithm of 'base'
it's used in multi-thread environment
*/
uint ToString_LogBase(uint base, Big<exp,man> & result)
{
TTMATH_ASSERT( base>=2 && base<=16 )
@ -3027,6 +3063,7 @@ private:
return (c==0)? 0 : 1;
}
#endif
/*!
an auxiliary method for converting into the string (private)