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Enable mixing types in numext::pow

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This commit is contained in:
Gael Guennebaud 2016-06-10 15:58:04 +02:00
parent 2e238bafb6
commit 5fdd703629
3 changed files with 17 additions and 22 deletions
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35
Eigen/src/Core/MathFunctions.h
View File

@ -494,24 +494,26 @@ struct log1p_retval
* Implementation of pow *
****************************************************************************/
template<typename Scalar, bool IsInteger>
struct pow_default_impl
template<typename ScalarX,typename ScalarY, bool IsInteger = NumTraits<ScalarX>::IsInteger&&NumTraits<ScalarY>::IsInteger>
struct pow_impl
{
typedef Scalar retval;
static EIGEN_DEVICE_FUNC inline Scalar run(const Scalar& x, const Scalar& y)
//typedef Scalar retval;
typedef typename ScalarBinaryOpTraits<ScalarX,ScalarY,internal::scalar_binary_pow_op<ScalarX,ScalarY> >::ReturnType result_type;
static EIGEN_DEVICE_FUNC inline result_type run(const ScalarX& x, const ScalarY& y)
{
EIGEN_USING_STD_MATH(pow);
return pow(x, y);
}
};
template<typename Scalar>
struct pow_default_impl<Scalar, true>
template<typename ScalarX,typename ScalarY>
struct pow_impl<ScalarX,ScalarY, true>
{
static EIGEN_DEVICE_FUNC inline Scalar run(Scalar x, Scalar y)
typedef ScalarX result_type;
static EIGEN_DEVICE_FUNC inline ScalarX run(const ScalarX &x, const ScalarY &y)
{
Scalar res(1);
eigen_assert(!NumTraits<Scalar>::IsSigned || y >= 0);
ScalarX res(1);
eigen_assert(!NumTraits<ScalarY>::IsSigned || y >= 0);
if(y & 1) res *= x;
y >>= 1;
while(y)
@ -524,15 +526,6 @@ struct pow_default_impl<Scalar, true>
}
};
template<typename Scalar>
struct pow_impl : pow_default_impl<Scalar, NumTraits<Scalar>::IsInteger> {};
template<typename Scalar>
struct pow_retval
{
typedef Scalar type;
};
/****************************************************************************
* Implementation of random *
****************************************************************************/
@ -928,11 +921,11 @@ inline EIGEN_MATHFUNC_RETVAL(log1p, Scalar) log1p(const Scalar& x)
return EIGEN_MATHFUNC_IMPL(log1p, Scalar)::run(x);
}
template<typename Scalar>
template<typename ScalarX,typename ScalarY>
EIGEN_DEVICE_FUNC
inline EIGEN_MATHFUNC_RETVAL(pow, Scalar) pow(const Scalar& x, const Scalar& y)
inline typename internal::pow_impl<ScalarX,ScalarY>::result_type pow(const ScalarX& x, const ScalarY& y)
{
return EIGEN_MATHFUNC_IMPL(pow, Scalar)::run(x, y);
return internal::pow_impl<ScalarX,ScalarY>::run(x, y);
}
template<typename T> EIGEN_DEVICE_FUNC bool (isnan) (const T &x) { return internal::isnan_impl(x); }

3
Eigen/src/Core/functors/BinaryFunctors.h
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@ -251,9 +251,10 @@ struct functor_traits<scalar_hypot_op<Scalar,Scalar> > {
* \brief Template functor to compute the pow of two scalars
*/
template<typename Scalar, typename OtherScalar> struct scalar_binary_pow_op {
typedef typename ScalarBinaryOpTraits<Scalar,OtherScalar,scalar_binary_pow_op>::ReturnType result_type;
EIGEN_EMPTY_STRUCT_CTOR(scalar_binary_pow_op)
EIGEN_DEVICE_FUNC
inline Scalar operator() (const Scalar& a, const OtherScalar& b) const { return numext::pow(a, b); }
inline result_type operator() (const Scalar& a, const OtherScalar& b) const { return numext::pow(a, b); }
};
template<typename Scalar, typename OtherScalar>
struct functor_traits<scalar_binary_pow_op<Scalar,OtherScalar> > {

1
Eigen/src/Core/util/ForwardDeclarations.h
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@ -217,6 +217,7 @@ template<typename LhsScalar,typename RhsScalar=LhsScalar> struct scalar_product_
template<typename LhsScalar,typename RhsScalar=LhsScalar> struct scalar_quotient_op;
template<typename LhsScalar,typename RhsScalar> struct scalar_multiple2_op;
template<typename LhsScalar,typename RhsScalar> struct scalar_quotient2_op;
template<typename ScalarX, typename ScalarY> struct scalar_binary_pow_op;
} // end namespace internal