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log1p is defined only for real Scalars in C++11

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This commit is contained in:
Christoph Hertzberg 2015-02-21 19:58:24 +01:00
parent 6af6cf0c2e
commit ecbf2a6656
1 changed files with 19 additions and 13 deletions
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24
Eigen/src/Core/MathFunctions.h
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@ -362,26 +362,32 @@ inline NewType cast(const OldType& x)
/****************************************************************************
* Implementation of logp1 *
****************************************************************************/
template<typename Scalar>
template<typename Scalar, bool isComplex = NumTraits<Scalar>::IsComplex >
struct log1p_impl
{
static inline Scalar run(const Scalar& x)
{
EIGEN_STATIC_ASSERT_NON_INTEGER(Scalar)
// Let's be conservative and enable the default C++11 implementation only if we are sure it exists
#if (__cplusplus >= 201103L) && (EIGEN_COMP_GNUC_STRICT || EIGEN_COMP_CLANG || EIGEN_COMP_MSVC || EIGEN_COMP_ICC) \
&& (EIGEN_ARCH_i386_OR_x86_64) && (EIGEN_OS_GNULINUX || EIGEN_OS_WIN_STRICT || EIGEN_OS_MAC)
using std::log1p;
return log1p(x);
#else
typedef typename NumTraits<Scalar>::Real RealScalar;
using std::log;
Scalar x1p = RealScalar(1) + x;
return ( x1p == Scalar(1) ) ? x : x * ( log(x1p) / (x1p - RealScalar(1)) );
#endif
}
};
// In C++11 we can specialize log1p_impl for real Scalars
// Let's be conservative and enable the default C++11 implementation only if we are sure it exists
#if (__cplusplus >= 201103L) && (EIGEN_COMP_GNUC_STRICT || EIGEN_COMP_CLANG || EIGEN_COMP_MSVC || EIGEN_COMP_ICC) \
&& (EIGEN_ARCH_i386_OR_x86_64) && (EIGEN_OS_GNULINUX || EIGEN_OS_WIN_STRICT || EIGEN_OS_MAC)
template<typename Scalar>
struct log1p_impl<Scalar, false> {
static inline Scalar run(const Scalar& x)
{
EIGEN_STATIC_ASSERT_NON_INTEGER(Scalar)
using std::log1p;
return log1p(x);
}
};
#endif
template<typename Scalar>
struct log1p_retval