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move the computation of the number of significant digits to a templated helper struct, that can be specialized to custom types if needed. Should address this request:

Browse Source 
http://forum.kde.org/viewtopic.php?f=74&t=86914
This commit is contained in:
Benoit Jacob 2010-03-30 11:38:09 -04:00
parent e6300efb5c
commit 8f99ae5ea4
1 changed files with 11 additions and 3 deletions
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14
Eigen/src/Core/IO.h
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@ -126,6 +126,16 @@ DenseBase<Derived>::format(const IOFormat& fmt) const
return WithFormat<Derived>(derived(), fmt);
}
template<typename Scalar>
struct ei_significant_decimals_impl
{
typedef typename NumTraits<Scalar>::Real RealScalar;
static inline int run()
{
return (int) std::ceil(-ei_log(NumTraits<RealScalar>::epsilon())/ei_log(RealScalar(10)));
}
};
/** \internal
* print the matrix \a _m to the output stream \a s using the output format \a fmt */
template<typename Derived>
@ -145,9 +155,7 @@ std::ostream & ei_print_matrix(std::ostream & s, const Derived& _m, const IOForm
{
if (NumTraits<Scalar>::HasFloatingPoint)
{
typedef typename NumTraits<Scalar>::Real RealScalar;
RealScalar explicit_precision_fp = std::ceil(-ei_log(NumTraits<Scalar>::epsilon())/ei_log(10.0));
explicit_precision = static_cast<std::streamsize>(explicit_precision_fp);
explicit_precision = ei_significant_decimals_impl<Scalar>::run();
}
else
{