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Issue with mpreal and std::numeric_limits, i.e. digits is not a constant. Added a digits() traits in NumTraits with fallback to static constant. Specialization for mpreal added in MPRealSupport.

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This commit is contained in:
Simon Praetorius 2017-03-24 17:45:56 +01:00
parent aae19c70ac
commit 511810797e
3 changed files with 38 additions and 1 deletions
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34
Eigen/src/Core/NumTraits.h
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@ -41,6 +41,34 @@ struct default_digits10_impl<T,false,true> // Integer
static int run() { return 0; }
};
// default implementation of digits(), based on numeric_limits if specialized,
// 0 for integer types, and log2(epsilon()) otherwise.
template< typename T,
bool use_numeric_limits = std::numeric_limits<T>::is_specialized,
bool is_integer = NumTraits<T>::IsInteger>
struct default_digits_impl
{
static int run() { return std::numeric_limits<T>::digits; }
};
template<typename T>
struct default_digits_impl<T,false,false> // Floating point
{
static int run() {
using std::log;
using std::ceil;
typedef typename NumTraits<T>::Real Real;
return int(ceil(-log(NumTraits<Real>::epsilon())/log(static_cast<Real>(2))));
}
};
template<typename T>
struct default_digits_impl<T,false,true> // Integer
{
static int run() { return 0; }
};
} // end namespace internal
/** \class NumTraits
@ -118,6 +146,12 @@ template<typename T> struct GenericNumTraits
return internal::default_digits10_impl<T>::run();
}
EIGEN_DEVICE_FUNC
static inline int digits()
{
return internal::default_digits_impl<T>::run();
}
EIGEN_DEVICE_FUNC
static inline Real dummy_precision()
{

2
Eigen/src/Core/StableNorm.h
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@ -74,7 +74,7 @@ blueNorm_impl(const EigenBase<Derived>& _vec)
// are used. For any specific computer, each of the assignment
// statements can be replaced
ibeta = std::numeric_limits<RealScalar>::radix; // base for floating-point numbers
it = std::numeric_limits<RealScalar>::digits; // number of base-beta digits in mantissa
it = NumTraits<RealScalar>::digits(); // number of base-beta digits in mantissa
iemin = std::numeric_limits<RealScalar>::min_exponent; // minimum exponent
iemax = std::numeric_limits<RealScalar>::max_exponent; // maximum exponent
rbig = (std::numeric_limits<RealScalar>::max)(); // largest floating-point number

3
unsupported/Eigen/MPRealSupport
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@ -90,6 +90,9 @@ int main()
#ifdef MPREAL_HAVE_DYNAMIC_STD_NUMERIC_LIMITS
static inline int digits10 (long Precision = mpfr::mpreal::get_default_prec()) { return std::numeric_limits<Real>::digits10(Precision); }
static inline int digits10 (const Real& x) { return std::numeric_limits<Real>::digits10(x); }
static inline int digits () { return std::numeric_limits<Real>::digits(); }
static inline int digits (const Real& x) { return std::numeric_limits<Real>::digits(x); }
#endif
static inline Real dummy_precision()